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KAGEYAMA Kensuke
| Mechanical Science Division | Professor |
| Department of Mechanical Engineering and System Design |
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Researcher information
■ Degree■ Research Keyword
- Sensor
- Electret
- Acoustic Emission
- Biological Acoustic Emission
- Acoustic Emission from the human body
- Non-Destructive Evaluation
- Ultrasound
- Acoustics
- Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electric/electronic material engineering
- Nanotechnology/Materials, Structural and functional materials
- Environmental science/Agricultural science, Environmental load reduction/restoration technology
- Environmental science/Agricultural science, Environmental impact assessment
- Environmental science/Agricultural science, Agricultural environmental and information engineering
- 2014 - Present, Saitama University, Graduate School of Science and Engineering, Professor
- 2007 - 2014, Saitama University, Graduate School of Science and Engineering, Associate Professor
- 2001 - 2007, Saitama University, Faculty of Engineering, Associate Professor
- 1998 - 2001, Saitama University, Faculty of Engineering, Lecturer
- 1995 - 1998, Saitama University, Faculty of Engineering, Research Associate
- 1990 - 1991, Nissan Mortar Corporation
- 1992 - 1995, The University of Tokyo, Graduate School of Engineering, Department of Advanced Interdisciplinary Studies, Japan
- 1988 - 1990, The University of Tokyo, Graduate School of Engineering, Japan
- 1988, The University of Tokyo, The Faculty of Engineering, Japan
Performance information
■ Paper- Molecular Dynamics Study on Effect of Contamination on Mechanical Properties of CFRP Joints
Takenobu SAKAI; Reimon TERAZAWA; Kensuke KAGEYAMA
Journal of the Japan Society for Composite Materials, Volume：50, Number：5, First page：177, Last page：184, Sep. 2024
The Japan Society for Composite Materials, Scientific journal
DOI：https://doi.org/10.6089/jscm.50.177
DOI ID：10.6089/jscm.50.177, ISSN：0385-2563, eISSN：1884-8559 - Effects of different loading methods in molecular dynamics on deformation behavior of polymer crystals
Koki Yoshida; Kensuke Kageyama; Takenobu Sakai
Mechanics of Time-Dependent Materials, Volume：28, Number：3, First page：1583, Last page：1595, Sep. 2024
Thermoplastics have a crystal structure. It has been pointed out that the crystalline structure affects viscoelastic behavior in crystalline polymers, which must be taken into account in MD simulations. In this study the crystalline lamellar structure of Polyethylene (PE) was reproduced via molecular dynamics. To investigate the mechanical behavior and deformation behavior of the lamellar structure of PE, deformation was applied to the model under a constant tensile rate and constant tensile load as tensile and creep analyses, respectively. A tensile analysis indicated localized cracking, and a creep analysis revealed molecular-chain undulation along the tensile direction. To clarify the reason for the difference in deformation distribution between tensile and creep analyses, the potential energy during tensile loading was examined. In the tensile analysis, all the potential energies increased at the start of tension development and decreased rapidly at the break. As revealed in the creep analysis, the bond stretching and bond angle potential energies did not change when deformation started at a strain of approximately 0.20. These results indicated that the deformation behavior depended on the loading configuration, such as tensile and creep loading, and that deformation behaviors vary because of differences in displacement distribution and potential energy.
Scientific journal
DOI：https://doi.org/10.1007/s11043-023-09641-9
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85173496796&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85173496796&origin=inward
DOI ID：10.1007/s11043-023-09641-9, ISSN：1385-2000, eISSN：1573-2738, SCOPUS ID：85173496796 - Detection of AE Caused by Photosynthesis in Algae Culture Tanks and Effect of Culture Conditions on AE Generation Behavior
Kodai Fukuda; Kensuke Kageyama
IEEJ Transactions on Sensors and Micromachines, Volume：144, Number：4, First page：68, Last page：75, Apr. 2024, [Reviewed]
Institute of Electrical Engineers of Japan (IEE Japan), Scientific journal
DOI：https://doi.org/10.1541/ieejsmas.144.68
DOI ID：10.1541/ieejsmas.144.68, ISSN：1341-8939, eISSN：1347-5525 - Application of AE Method to Crack Tip Location and Damage Mode Evaluation on Mode-I and Mode-II Tests for CFRP
Takenobu SAKAI; Kakeru MIURA; Kensuke KAGEYAMA
Journal of the Japanese Society for Experimental Mechanics, Volume：23, Number：2, First page：132, Last page：137, Jul. 2023, [Reviewed]
Japanese, Scientific journal
DOI：https://doi.org/10.11395/jjsem.23.132
DOI ID：10.11395/jjsem.23.132 - Fabrication and Characteristics of Electret Ultrasonic-Sensor using Laser Patterning
Kakeru Kobayashi; Yoshiaki Kawada; Kensuke Kageyama
IEEJ Transactions on Sensors and Micromachines, Volume：143, Number：6, First page：102, Last page：109, Jun. 2023, [Reviewed]
Institute of Electrical Engineers of Japan (IEE Japan), Scientific journal
DOI：https://doi.org/10.1541/ieejsmas.143.102
DOI ID：10.1541/ieejsmas.143.102, ISSN：1341-8939, eISSN：1347-5525 - Effect of the Frequency Characteristics of AE Sensor on the Evaluation of CFRP Damage Modes
Tomohisa SHIRAISHI; Takenobu SAKAI; Kensuke KAGEYAMA
Volume：23, Number：2, First page：145, Last page：151, Jun. 2023, [Reviewed]
Japanese, Scientific journal
DOI：https://doi.org/10.11395/jjsem.23.145
DOI ID：10.11395/jjsem.23.145 - Study on the AE Measurement and Activity Monitoring of Living Plants in Outdoor Environment using Electret Sensors
Kageyama Kensuke
IEEJ Transactions on Sensors and Micromachines, Volume：142, Number：11, First page：300, Last page：307, Nov. 2022, [Reviewed]
Transpiration of living plants causes the cavitation in the xylem and the acoustic emissions (AE) emitted during transpiration can be measured to monitor the activity of the plants. In this study, electret sensors (ECS) and IoT devices were prepared at low cost and the long-term plant AE measurements in outdoor environments of strawberry greenhouses and tea plantation were carried out. In greenhouse-grown strawberries, AE determination was performed considering as noise if AEs were detected more than once per second. Most AEs occurred during the daytime, and AEs caused by transpiration-induced cavitation could be measured. Furthermore, the correlation between the center of gravity (WH) of the AE occurrence hour of day and fruit quality was examined, and it was found that the later the WH, the higher the sugar content of the fruit. On the other hand, a large number of AE were detected due to rainfall when the AE determination was conducted on tea trees in the open field. Such an AE occurrence due to rainfall was eliminated by neglecting AE occurrence when soil moisture increased. Then, the 7-day moving average of the daily AE generation showed a strong correlation with soil temperature. These results indicate the possibility to monitor AE in outdoor environments such as greenhouse cultivation and open field cultivation using ECS and IoT devices.
The Institute of Electrical Engineers of Japan, Japanese
DOI：https://doi.org/10.1541/ieejsmas.142.300
DOI ID：10.1541/ieejsmas.142.300, ISSN：1341-8939, eISSN：1347-5525, CiNii Books ID：AN1052634X - Fabrication and characteristics of electret using fine silica powder and its application of ultrasonic sensor
Kensuke Kageyama; Kakeru Kobayashi; Yoshiaki Kawada; Takenobu Sakai
ELECTRONICS AND COMMUNICATIONS IN JAPAN, Volume：105, Number：3, Sep. 2022, [Reviewed]
Electrets were prepared by spin-coating the dispersion of fine silica powders, and their charge retention characteristics were investigated. Finer silica aggregates were formed on the PTFE surface layer by spin-coating the dispersed solution of fine silica powder than those formed by spray-coating colloidal silica. Electrets using fine silica powder also showed better charge retention characteristics than those using colloidal silica. Such an improvement in the charge retention might be due to the suppression of discharge in the excessive gap caused by coarse silica aggregates. Then, ECSs were fabricated using the prepared electrets, and their transmitting and receiving characteristics of airborne ultrasound were also investigated. The peak sensitivity of the ECS using a spin coating of fine powdered silica dispersion was slightly improved from those using spray coating of colloidal silica. On the other hand, the peak frequency and frequency band were greatly improved using spin coating of fine powdered silica dispersion. Therefore, ECS using fine silica powder is expected to be applied as a broadband airborne ultrasonic sensor.
WILEY, English, Scientific journal
DOI：https://doi.org/10.1002/ecj.12372
DOI ID：10.1002/ecj.12372, ISSN：1942-9533, eISSN：1942-9541, Web of Science ID：WOS:000840118200001 - ポリエチレンにおける時間–温度換算則の現象の解明
Shihong Yuan; Ayako Mano; Kensuke Kageyama; Takenobu Sakai
Journal of the Japan Society for Composite Materials, Volume：48, Number：4, First page：149, Last page：155, Jul. 2022, [Reviewed]
The Japan Society for Composite Materials, Scientific journal
DOI：https://doi.org/10.6089/jscm.48.149
DOI ID：10.6089/jscm.48.149, ISSN：0385-2563, eISSN：1884-8559 - Effect of heat treatment on mechanical properties of carbon-fiber-reinforced themoplastic
Fukushima, Ryota; Yamada, Yohei; Kageyama, Kensuke; Sakai, Takenobu
Advanced Composite Materials, Volume：30, Number：6, First page：527, Last page：543, Jul. 2021, [Reviewed]
Taylor \& Francis, Scientific journal
ORCID：129389372 - Molecular dynamics simulation of weak bonds in carbon fiber reinforced plastic adhesive joints
Reimon Terazawa; Atsushi Tamura; Kensuke Kageyama; Takenobu Sakai
Advanced Composite Materials, Mar. 2021, [Reviewed]
In carbon fiber-reinforced plastic (CFRP) adhesive joints, poor adhesion because of weak bonds may occur due to contamination at the bond line. We reproduced weak bonds by using a molecular dynamics simulation (MD) approach to investigate the mechanisms of weak bonds. Weak-bond models were created by inserting water (H2O), xylene (C8H10), and silicone molecules as contaminants in the two epoxy models. Tensile analysis was performed to evaluate the mechanical properties of the weak-bond models. The results revealed that the insertion of contaminants reduced the strength of these models. Stress concentration occurred due to the concentration of inserted molecules at the bond line. In addition, the yielding behavior was slower in the H2O model than in the C8H10 and silicone models, and the strength of the H2O model decreased significantly even at a small insertion rate compared with the C8H10 and silicone models. The reason for the difference in yielding behavior may be due to the high diffusion of H2O molecules into the whole epoxy resin. The weak-bond model was reproduced using MD, and the mechanisms of weak bonds were clarified by an analysis of van der Waals potential energy.
Taylor and Francis Ltd., English, Scientific journal
DOI：https://doi.org/10.1080/09243046.2021.1893887
DOI ID：10.1080/09243046.2021.1893887, ISSN：1568-5519, SCOPUS ID：85102945906 - Effect of matrix crystallinity of carbon fiber reinforced polyamide 6 on static bending properties
Takenobu Sakai; Nur Safiah Binti Shamsudim; Ryota Fukushima; Kensuke Kageyama
Advanced Composite Materials, First page：1, Last page：14, Aug. 2020, [Reviewed]
Informa UK Limited, Scientific journal
DOI：https://doi.org/10.1080/09243046.2020.1802805
DOI ID：10.1080/09243046.2020.1802805, ISSN：0924-3046, eISSN：1568-5519 - Investigation of Drought Stress Response in Tomato Plants by Simultaneous Measurement of AE and Environment
Kensuke Kageyama; Yoshimasa Hayashi; Anamu Kanno; Takenobu Sakai
ECO-ENGINEERING, Volume：32, Number：1, First page：1, Last page：5, 2020, [Reviewed]
Simultaneous measurement system of AE at the stem and illuminance, temperature and humidity of the ground surface in greenhouse cultivation tomatoes was developed and the simultaneous measurement were carried out at two sites. AE occurrence rate tended to decrease in winter similar to humidity deficit HD. Most AE occurred in the daytime though the daily fluctuation behavior of HD and AE events differed by the site. The rank correlation coefficients, RV1h and RV6h using hourly differentials of AE events and HD, and those from 6h moving average values, respectively were derived. As the result, the strong correlation found between average value of RV1h of the whole period and yield Y, and there was also the weak correlation between monthly average value of RV1h and Y.
SOC ECO-ENGINEERING, ENV SCI & TECH, GRAD SCH LIFE & ENV SCI, Japanese, Scientific journal
DOI：https://doi.org/10.11450/seitaikogaku.32.1
DOI ID：10.11450/seitaikogaku.32.1, ISSN：1347-0485, eISSN：1880-4500, Web of Science ID：WOS:000510837400001 - AE measurement of greenhouse strawberry using electret sensor for activity monitoring
Kensuke Kageyama; Kazuyuki Kojima
2019 IEEE 8th Global Conference on Consumer Electronics, GCCE 2019, First page：585, Last page：586, Oct. 2019
AE measurements of strawberry plants in greenhouse were examined for the activity monitoring. The electret condenser sensor (ECS) could detect many AE events mainly in daytime at the petiole. Number of daily AE event showed weak correlation with the number of fruits. On the other hand, AEs were also detected at nighttime and occasionally exceeded the number of AE at daytime. Such a AEs at nighttime might reflect the cavitation vulnerability of the plants because AE occurrence ratio of nighttime showed a peak to the number of fruits.
Institute of Electrical and Electronics Engineers Inc., English, International conference proceedings
DOI：https://doi.org/10.1109/GCCE46687.2019.9015443
DOI ID：10.1109/GCCE46687.2019.9015443, SCOPUS ID：85081961955 - 分子動力学シミュレーションによるポリカーボネートの体積クリープの静水圧依存性評価
坂井 建宣; 鈴木 将士; 蔭山 健介
Volume：45, Number：1, First page：26, Last page：33, 2019, [Reviewed] - 炭素繊維強化ポリアミドの結晶化が静的曲げ特性に及ぼす影響
坂井 建宣; Nur Safiah; Binti Shamsudim; 福嶋遼太; 蔭山健介
Volume：45, Number：6, First page：223, Last page：229, 2019, [Reviewed] - Evaluation of Degradation State of Used Bedsore Preventing Mattress
Takenobu Sakai; Ryoichiro Ito; Kensuke Kageyama
2018 IEEE 7th Global Conference on Consumer Electronics, GCCE 2018, First page：447, Last page：450, Dec. 2018
Bedsore preventing mattress needs body pressure dispersibility, and this properties related to the mattress's viscoelasticity. In the hospital and rental shop of mattress, the judgement of the degradation of mattress was carried out by manual operation, however, there is no quantitative evaluation method of the degradation has existed. In this study, degradation state of used bedsore preventing mattress was evaluated using dynamic mechanical analysis (DMA) which can measure the material's viscoelasticity.
Institute of Electrical and Electronics Engineers Inc., English, International conference proceedings
DOI：https://doi.org/10.1109/GCCE.2018.8574712
DOI ID：10.1109/GCCE.2018.8574712, SCOPUS ID：85060271944 - Evaluation for Mechanical Properties of Wasted Tire Reinforced PLA
SAKAI, TAKENOBU; KAWAI, KYOSUKE; KAGEYAMA, KENSUKE; TATEYAMA, KOHEI; YAMADA, HIROYUKI; RIOS, SOBERANIS CR; RODROGUEZ-LAVIADA, J; PEREZ-PACHECO, E
強化プラスチックス, Volume：64, Number：1, First page：31, Last page：35, 2018
Scientific journal
ORCID：129389351 - 超音波センサに適した極薄PTFE層を有するシリカ凝集体エレクトレットの製作と特性評価
蔭山健介; 折笠健; アハマド ザリフ; アフィック ビン; ジャマルディン; 坂井建宣
Volume：138, Number：9, First page：441, Last page：447, 2018, [Reviewed] - Preparation and characteristic evaluation of silica-agglomerate electret with ultra-thin PTFE layer for Ultrasonic Sensor
Kageyama, Kensuke; Orikasa, Takeru; Jamaludin, Ahmad Zarif Afiq Bin; Sakai, Takenobu
IEEJ Transactions on Sensors and Micromachines, Volume：138, Number：9, First page：441, Last page：447, Jan. 2018, [Reviewed]
© 2018 The Institute of Electrical Engineers of Japan. Influence of formation of silica agglomerates on a ultra-thin fluororesin electret on the characteristics of the charge-retention and the aero-ultrasonic sensor was investigated. The ultra-thin PTFE layer (thickness was 2.8 μm) was obtained by spin-coating and silica agglomerates were formed by spraying droplets of colloidal silica. The formation of PTFE/silica agglomerate composite layer on PTFE layer resulted the larger and more flat agglomerates than the formation of single layer of silica agglomerates on the PTFE layer. The measurement of the charge retention of the obtained electrets after 24 h at RT and at 250°C revealed that the formation of PTFE/silica-agglomerate composite layer on the ultra-thin PTFE layer enhanced the charge retention. Furthermore, the electret condenser sensor (ECS) fabricated using the silica-agglomerate electret on the ultra-thin PTFE layer exhibited the excellent sensitivity and high resonance frequency compared with conventional ECS with PFA layer (thickness was 12.5 μm).
Scientific journal
DOI：https://doi.org/10.1541/ieejsmas.138.441
DOI ID：10.1541/ieejsmas.138.441, ISSN：1341-8939, ORCID：129389352, SCOPUS ID：85052660116 - 廃タイヤ強化ポリ乳酸複合材料の機械的特性評価
坂井建宣; 川井喬介; 蔭山健介; 立山耕平; 山田浩之; C-R; Rios Soberanis; J. Rodroguez-Laviada; E. Perez-Pacheco
Volume：64, Number：1, First page：31, Last page：35, 2018, [Reviewed]
Japanese, Scientific journal - ＡＥ法を用いた炭素繊維熱可塑性ポリイミドの破壊過程の解明
坂井建宣; 安部聡; 後藤健; 小林訓史; 上田政人; 荻原慎二; 若山修一; 蔭山健介
Volume：17, Number：1, First page：27, Last page：33, Apr. 2017, [Reviewed]
Japanese - Evaluation of Irrigation Response using AE Method for Management of High-Frequency Irrigation of Hydroponic Miniature-Tomato
Kageyama, Kensuke; Sakai, Takenobu
Journal of Acoustic Emission, Volume：34, First page：S65, Last page：S65, 2017, [Reviewed]
Acoustic Emission Group, Scientific journal
ORCID：129389385 - フレキシブル基板を用いた胸部表面振動計測装置の開発
坂井建宣; 柴山正輝; 野方文雄; 蔭山健介
Volume：17, Number：1, First page：39, Last page：44, 2017, [Reviewed] - Fabrication and Characteristic Evaluation of Electret Condenser Sensor for Measurement of Acoustic Emission in Living Tree
KAGEYAMA Kensuke; LU Ziyao; SUGAWARA Takuya; SAKAI Takenobu
Journal of the Japanese Society for Experimental Mechanics, Volume：16, Number：4, First page：295, Last page：300, 2017, [Reviewed]
<p> Electret condenser sensors (ECS) is suitable for detection of ultrasounds propagating air and soft materials because it has an air gap in the element. In this study, ECS were fabricated to detect artificial acoustic emission (AE) propagating a wood plate and AEs at a trunk of acerola. ECS demonstrated the higher S/N ratio from 40 to 100 kHz for the detection of the artificial AEs than a piezoelectric AE sensor (PS) and a wideband acceleration sensor (AC). The AEs detected by ECS showed several frequency peak from 50 to 200 kHz at the AE measurement at a trunk of acerola while the AE detected by PS also showed wide frequency from 100 to 500 kHz. Furthermore, the ECS had the same degree of sensitivity as PS at AE measurement at the trunk of acerola while AC hardly detected the AEs. The AE behavior of ES, however, did not partially coincide with the significant increase of AE events of PS. Hence, the long-term reliability of ES must be investigated for practical use of AE measurement of woody plants.</p>
The Japanese Society for Experimental Mechanics, Japanese
DOI：https://doi.org/10.11395/jjsem.16.295
DOI ID：10.11395/jjsem.16.295, ISSN：1346-4930, CiNii Articles ID：130005300055, CiNii Books ID：AA11822914 - Fabrication and characterization of Silica-aggregate electret with improved wettability of the PFA and the colloidal silica
呉 シンク; 蔭山 健介; 坂井 建宣
Volume：33, First page：1, Last page：6, Oct. 2016, [Reviewed]
Institute of Electrical Engineers of Japan, Japanese
CiNii Articles ID：40021215456 - FilmECS アレイを用いたモーションセンサーの製作と特性評価; FilmECS アレイを用いたモーションセンサーの製作と特性評価; Fabrication and Evaluation of the Motion Sensor using FilmECS Array
Onodera, Masaru; Kageyama, Kensuke
IEEJ Transactions on Sensors and Micromachines, Volume：136, Number：4, First page：120, Last page：126, 2016
Scientific journal
ORCID：129389360 - Fabrication and Evaluation of the Motion Sesor using FilmECS Array
Onodera, M; Kageyama, K
IEEJ Transactions on Sensors and Micromachines, Volume：136, First page：120, Last page：126, 2016
Scientific journal
ORCID：129389316 - Detection of cavitation in stem of miniature tomato using acceleration sensor
KAGEYAMA, Kensuke; HALIM, Iman BA; KIMURA, Kouya; SAKAI, Tatemasa
Advanced Experimental Mechanics, Volume：1, First page：214, Last page：218, 2016, [Reviewed]
The Japanese Society for Experimental Mechanics, Scientific journal
ORCID：129389324 - Charge Retention of Silica-Agglomerate Electret using Electrostatic Spraying at Elevated Temperatures
WU, Chenye; KAGEYAMA, Kensuke; SAKAI, Takenobu
Advanced Experimental Mechanics, Volume：1, First page：120, Last page：125, 2016, [Reviewed]
The Japanese Society for Experimental Mechanics, Scientific journal
ORCID：129389320 - 樹木のアコースティック・エミッション測定を目的としたエレクとレットセンサの製作と特性評価
蔭山健介; 魯子 暁; 菅原拓也; 坂井建宣
Volume：16, Number：3, First page：9, Last page：14, 2016, [Reviewed] - Fabrication and Evaluation of Dual Sensor using Electret Sensor with Film Lamination
ONODERA, Masaru; KAGEYAMA, Kensuke
Journal of the Japanese Society for Experimental Mechanics, Volume：15, Number：1, First page：64, Last page：68, 2015
The Japanese Society for Experimental Mechanics, Scientific journal
ORCID：129389368 - Improvement of heat resistance of silica-agglomerate electret using electrostatic spraying
WU Chenye; KAGEYAMA Kensuke; SAKAI Tatenobu
Mechanical Engineering Journal, Volume：2, Number：3, First page：1, Last page：15, 2015, [Reviewed]
The silica-agglomerate electret could be obtained after spraying negatively charged solution of colloidal silica on a fluororesin film using an electrostatic spraying technique. The surface electric potential was measured after spraying to investigate which method was suitable for preparing the electret. As a result, the method in which a spray gun was installed to a conventional corona-charging setup delivered the electret with the amplitude of the electric surface potential over 0.8 kV. The silica agglomerates using an electrostatic spraying technique (ES electret) showed larger diameter D and lower point density N than those using conventional technique (corona-charging after spraying, CC electret). Furthermore, the prepared electrets were heated to examine the improvement of the heat resistivity by the electrostatic spraying. Then, the obtained silica-agglomerate electret showed better heat resistivity than the conventional silica-agglomerate electret. Then, the charge retention at 250°C R250 of ES electrets prepared in this study was higher than 57 % when the electrets suffered high temperature from 200 to 250 °C for 12.5 min at the heating test. Consequently, it can be concluded that the electrostatic spraying was excellent technique to obtain the silica-agglomerates electret with high heat resistance.
The Japan Society of Mechanical Engineers, English, Scientific journal
DOI：https://doi.org/10.1299/mej.15-00064
DOI ID：10.1299/mej.15-00064, ISSN：2187-9745, CiNii Articles ID：130005071473, Web of Science ID：WOS:000434617000025 - シリカ凝集体を用いた PFA フィルムエレクトレットの耐熱性向上; シリカ凝集体を用いた PFA フィルムエレクトレットの耐熱性向上; Improvement of Heat Resistance of PFA Film Electret using Silica Agglomerates
Kageyama, Kensuke; Mimura, Shouhei; Sakai, Tatemasa
IEEJ Transactions on Sensors and Micromachines, Volume：134, Number：4, First page：122, Last page：128, 2015, [Reviewed]
The silica agglomerates were formed on PFA film by the application of colloidal silica followed by drying to prepared the silica-agglomerates electret. Three methods, inkjet-printing, air-spray and ultrasonic nebulization, were used to apply the colloidal silica on the film. The prepared electrets were heated on a hot plate to investigate the heat resistance. The silica-agglomerates electret showed higher charge retention than the PFA electret over 200℃. The electret on which silica agglomerates were formed by inkjet-printing or air-spray indicated that the charge retention was monotonically increased with the area fraction of silica agglomerates. Furthermore, the prepared electrets were kept under humidity of 60 to 70% to investigate the humidity resistance. The charge retention of the electret n which silica agglomerates were formed by inkjet-printing was not changed while it was gradually decreased when silica agglomerates were formed by ultrasonic nebulization. These results suggested that the application of silica agglomerates was effective method to enhance heat resistance of fluorine resin film.
The Institute of Electrical Engineers of Japan, Japanese, Scientific journal
DOI：https://doi.org/10.1541/ieejsmas.135.122
DOI ID：10.1541/ieejsmas.135.122, ISSN：1341-8939, J-Global ID：201502231933164684, CiNii Articles ID：130005061964, ORCID：129389393 - Measurement of Loading Induced Acoustic Emissions at Stem of Miniature Tomato Plants
KAGEYAMA, Kensuke; TAJIMA, Kansuke
Journal of the Japanese Society for Experimental Mechanics, Volume：14, Number：Special\_Issue, First page：s116, Last page：s121, 2014
The Japanese Society for Experimental Mechanics, Scientific journal
ORCID：129389358 - Deficit Irrigation of Miniature Tomato Based on Estimation of Embolism Risk by Measurements of Acoustic Emission and Stress Wave at Stem
KAGEYAMA Kensuke; MORI Osamu
Proceedings of the Japan Society for Photoelasticity, Volume：13, First page：s85, Last page：s91, Jul. 2013, [Reviewed]
The drought risk evaluation of cultivating plants is the most important factor on deficit irrigation (DI). The DI, however, often causes the cavitation and embolism followed by growth inhibition of the plant. Acoustic emissions (AE) detected on a stem are associated with cavitation. Authors proposed the model in which the change in AE behavior against the change in drought stress reflects the embolism risk. Furthermore, a stress wave velocity (SWV) through stem was measured to guarantee the decrease in the drought stress of a soil-cultivated plant. In this study, the hybrid measurement of AE and SWV at stem of miniature tomato was done for controlling DI. The change ratio of SWV caused by irrigation, RIV depended on the drought stress. The plants suffered severe drought stress showed that the change ratio of AE occurrence rate caused by irrigation, RIAE was increased. The DI using RIV and RIAE was successful to maintain the yield of fruits with high sugar content.
The Japanese Society for Experimental Mechanics, English
DOI：https://doi.org/10.11395/jjsem.13.s85
DOI ID：10.11395/jjsem.13.s85, ISSN：1346-4930, CiNii Articles ID：10031189799, CiNii Books ID：AA11822914 - Fabrication and Evaluation of Electret Condensor Microphone with Film Lamination and Silica Spacers
Kensuke Kageyama; Hideaki Nagashima
JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING, Volume：7, Number：4, First page：655, Last page：665, 2013, [Reviewed]
The electret condenser microphones (FilmECMs) with film lamination and silica agglomerates were fabricated and the influence of the silica agglomerates on the characteristic of the FilmECM was investigated. The silica agglomerates was formed on PFA (perfluoroalkoxy) films by the application of colloidal silica using inkjet printing. The silica agglomerates for spacers formed the microgaps between the insulation films in the gap. Eventually, The silica agglomerates drastically enhanced the sensitivity of FilmECM while the resonance frequency was decreased. The size and the interval of the silica agglomerates influenced on the sensitivity and the resonance frequency. Such a influence can be explained by the density of the contact points of the films and silica agglomerates in the gap of FilmECM. Thereby the FilmECM which had the comparable sensitivity with commercial ECM was obtained. The resonant frequency was much higher than audible frequency (around 50 kHz). Hence, a wideband ECM could be obtained using FilmECM if the poor sealing of the gap and the diffraction of the sound is eliminated.
JAPAN SOC MECHANICAL ENGINEERS, English, Scientific journal
DOI：https://doi.org/10.1299/jamdsm.7.655
DOI ID：10.1299/jamdsm.7.655, ISSN：1881-3054, Web of Science ID：WOS:000326248000013 - Fabrication and characteristic evaluation of electret condensor microphone with PFA film lamination
Kageyama, Kensuke; Nagashima, Hideaki
IEEJ Transactions on Sensors and MicroMachines, Volume：132, Number：1, First page：10, Last page：15, 2012
Scientific journal
ORCID：129389355 - Fabrication and evaluation of electret condenser sensors with layered microgaps for ultrasonic measurement of natural rubbers
KAGEYAMA, Kensuke
Journal of the Japanese Society for Experimental Mechanics, Volume：12, Number：1, First page：37, Last page：42, 2012
The Japanese Society for Experimental Mechanics, Scientific journal
ORCID：129389336 - Correlation of stress wave velocity transmitted through stem with stem structure of miniature tomato
KAGEYAMA, Kensuke; KURITA, Toshikazu
Journal of the Japanese Society for Experimental Mechanics, Volume：12, Number：Special\_Issue, First page：s139, Last page：s144, 2012
The Japanese Society for Experimental Mechanics, Scientific journal
ORCID：129389321 - Estimation for embolism risk of tomato using acoustic emission response to increased drought stress
Kensuke Kageyama; Yosuke Inoue; Hiroshi Kato
Environmental Control in Biology, Volume：47, Number：3, First page：127, Last page：136, 2009, [Reviewed]
Acoustic emission (AE) occurs in the xylem during cavitation. In fact, AE behavior is influenced by changes in drought stress. For this study, four AE sensors were attached to a miniature tomato plants to investigate AE behavior during a long-term. (32 d) change of drought stress. The change ratio of the AE occurrence rate from nighttime to daytime, RDAE roughly corresponded to the soil moisture when the soil moisture was less than 20% (VMC) though only one sample was used for the long-term measurement. Then, AE behavior occurring concomitantly with a rapid change of drought stress, induced by stem cutting, was investigated. The change ratio of AE occurrence rate caused by stem, cutting corresponded to the drought stress, which, was influenced by the cutting timing and soil moisture. The experimental resulte were explained using the model in which severe drought stress induced a transition of the embolism from temporary to permanent status. A. parameter incorporating the change ratio of the AE occurrence rate caused by stem cutting well indicated the degree of embolism risk.
Biotron Institute, English, Scientific journal
DOI：https://doi.org/10.2525/ecb.47.127
DOI ID：10.2525/ecb.47.127, ISSN：1883-0986, CiNii Articles ID：10025589418, SCOPUS ID：79953694243 - Non-Destructive Measurement of Vascular Tissue Development in Stems of Miniature Tomato Using Acoustic Method
Kageyama,K; Watanabe, E; Kato, H
Journal of Solid Mechanics and Materials Engineering, Journal of Solid Mechanics and Materials Engineering, Volume：2, Number：12, First page：1487, Last page：1496, 2008, [Reviewed]
The guided wave effect resembling that of annual rings found in woods and the cortical region of bones is believed to be observable in vascular tissues of herbaceous plants. The properties of acoustic waves traveling through the vascular tissue in the stem of a miniature tomato were measured using a piezoelectric pulser and receiver. The thickness of the vascular tissues and the stem's water content were measured. The detected acoustic waves showed a guided wave effect. The apparent sound velocity, va, was related to the vascular tissue thickness, tv. These results reveal that the detected acoustic waves traveled along the vascular tissues in stems. The maximum peak intensity of the detected acoustic waves, Imax was also related to t. Furthermore, wilting of the examined plants decreased the Imax, although va was not changed. The decrease in Imax might result from cavitations and embolisms with a subsequent increase in air pores in xylem tissues. These results demonstrate that the measurement of acoustic waves traveling through vascular tissue is a useful tool for the non-destructive evaluation of vascular tissue development and embolism density in xylem tissues.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jmmp.2.1487
DOI ID：10.1299/jmmp.2.1487, ISSN：1880-9871, CiNii Articles ID：130000079146 - Fabrication and Evaluation of Electret Condenser Microphone using Poled Ferroelectric Ceramics
Kageyama, K; Kato, H; Watanabe, S
Journal of Solid Mechanics and Materials Engineering, Journal of Solid Mechanics and Materials Engineering, Volume：2, Number：7, First page：877, Last page：887, 2008, [Reviewed]
PZT ceramics can emit a high electric field externally if surface charges are removed. For this study, the PZT surface charges were removed by heating. Then the electret microphones laminated with electrodes, insulation films, and a PZT element (disk) were prepared. Several contact conditions between laminated layers were examined to elucidate their influence on the microphones' sensitivity. The fabricated samples showed the same level of output (ΔVout) as a commercial electret microphone (sensitivity: 5.6 mV·Pa-1 [-45dB]), although the vibration amplitude of the fabricated samples was much smaller than that of the commercial microphone. The output measurement of laminating films under several conditions revealed that the interface gap between the layers had an important role in increasing the output. That of the fabricated samples, however, was degraded because of insufficient removal of surface charges and/or poor insulation properties. Furthermore, the output was temporarily decreased during heating between 50 and 180°C, but recovered after cooling to room temperature. Such behavior is explainable according to the pyroelectricity of PZT.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jmmp.2.877
DOI ID：10.1299/jmmp.2.877, ISSN：1880-9871, CiNii Articles ID：130000079310 - Detection of Weak Ultrasound Generated by Nano- and Femtosecond Laser Irradiation Using Piezoelectric Sensors
Kageyama, K; Kambara, T; Nakai, Y
Journal of Solid Mechanics and Materials Engineering, Volume：1, Number：9, First page：1128, Last page：1135, 2007, [Reviewed]
The possibility of detecting laser-generated ultrasound using slight temperature increases with piezoelectric sensors was investigated. The ultrasound noise generated by nanosecond laser irradiation with a theoretically 1 K temperature-rise was detected clearly by the piezoelectric AE sensors using a built-in head amplifier. The amplitude of the first arrival peaks obtained using the side and front sensors decreased monotonically with the source-sensor separation. The amplitude of ultrasound generated by femtosecond laser irradiation was greater than that by nanosecond laser irradiation with same pulse energy, but no great difference existed in the frequency spectrum of the ultrasonic waveforms.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jmmp.1.1128
DOI ID：10.1299/jmmp.1.1128, ISSN：1880-9871, CiNii Articles ID：130000078983 - Correlation between acoustic emissions generated from cavitation in rubber tree leaf veins
Kensuke Kageyama; Mitsuru Kaminaga; Hiroshi Kato
Environmental Control in Biology, Volume：45, Number：1, First page：59, Last page：65, 2007, [Reviewed]
Cavitation causes embolisms followed by a considerable decrease in xylem conductance: embolisms pose a serious obstacle to the continued uptake of water. Assuming that acoustic emissions (AEs) with high similarity would be generated from cavitation at the same element when refilling occurred, this study investigated the generation of such an AE in. a rubber tree's leaf vein. Cross-correlation analyses between the filtered AE waveforms showed the existence of AEs with a cross-correlation coefficient greater than 0.97. That result indicated that some AEs came from the same element in a leaf vein where cavitation and refilling occurred repeatedly. Assuming that a pair of AEs with, a high cross-correlation coefficient corresponded to the same embolism, the relationship between daily diameter change (DDC) and number of embolisms showed a better linear relation than that between DDC and total events of AE.
Biotron Institute, English, Scientific journal
DOI：https://doi.org/10.2525/ecb.45.59
DOI ID：10.2525/ecb.45.59, ISSN：1883-0986, CiNii Articles ID：10026886595, SCOPUS ID：79953695647 - TADASHI KAMBARA"), YASUYUKI KANAI', TAKAO M. KOJIMA", YOICHI NAKAI"), AKIRA YONEDA?), YASUNORI YAMAZAKI''
KAGEYAMA, KENSUKE
Journal of Acoustic Emission, Volume：24, First page：97, Last page：97, 2006
Acoustic Emission Group, Scientific journal
ORCID：129389396 - Elastic waves from fast heavy-ion irradiation on solids
Kambara, Tadashi; Kanai, Yasuyuki; Kojima, T; Nakai, Yoichi; Yoneda, Akira; Yamazaki, Yasunori; Kageyama, Kensuke
PROGRESS IN ACOUSTIC EMISSION, Volume：13, First page：277, Last page：277, 2006
Scientific journal
ORCID：129389382 - Variation in electrical properties of laminates with woven carbon fabric and ferroelectric or piezoelectric particulate epoxy due to tensile loading
K Kageyama; T Yoshikawa; H Kato
MATERIALS TRANSACTIONS, Volume：46, Number：3, First page：697, Last page：703, Mar. 2005, [Reviewed]
Measurement of electrical properties of fiber-reinforced plastics (FRPs) is an attractive method for predicting fatigue life and recording strain in FRPs. In this study, we prepared ferroelectric specimens laminated with woven carbon fabric and BaTiO3 particulate epoxy. We measured those specimens' electrical properties during tensile testing. Electrical resistance increased slightly and the electrical capacitance decreased as the tensile stress increased up to 500MPa. As the tensile stress increased above 500MPa, the electrical resistance and electrical capacitance increased. The electrical resistance and capacitance may be dependent on the applied tensile stress because of delamination between an epoxy layer and a carbon fabric layer, and fiber breakage in carbon fabric layers. Capacitance degradation from the beginning of tensile testing indicates that the addition of BaTiO3 Particles into epoxy layers induced the delamination. Subsequently, piezoelectric specimens laminated with woven carbon fabric and poled lead zirconate titanate (PZT) particulate epoxy were prepared for repeated loading tests. Thereby, we investigated the relationship between loading and piezoelectric signals. Variation in the capacitance of epoxy layers rather than that in the polarization of PZT particles may be the generation mechanism of measured signals in the piezoelectric specimens. The peak interval in the piezoelectric signal waveforms was deeply related to the applied tensile stress. The peak intensity tended to increase with loading cycles.
JAPAN INST METALS, English, Scientific journal
DOI：https://doi.org/10.2320/matertrans.46.697
DOI ID：10.2320/matertrans.46.697, ISSN：1345-9678, eISSN：1347-5320, CiNii Articles ID：10015579456, Web of Science ID：WOS:000228796300051 - Decrease in fatigue life of Sn-3.8 wt-% Ag-1.2 wt-% Cu alloy solder joints due to thermal cycling
Kato, H; Matsubara, K; Kageyama, K
Materials science and technology, Volume：19, Number：10, First page：1403, Last page：1410, 2003
Taylor \& Francis, Scientific journal
ORCID：129389400 - Development of local immersion method for real-time ultrasonic measurement in fatigue process
Min, X-H; Kato, H; Saito, H; Kageyama, K
JOURNAL OF JSNDI, Volume：52, Number：12, First page：697, Last page：702, 2003
JAPANESE SOCIETY FOR NON-DESTRUCTIVE INSPECTION, Scientific journal
ORCID：129389345 - Preparation and Mechanical Properties of Alumina-Zirconia Composites with Agglomerated Structures Using Pre-Sintered Powder
Kensuke Kageyama; Youhei Harada; Hiroshi Kato
Materials Transactions, Volume：44, Number：8, First page：1571, Last page：1576, 2003, [Reviewed]
It is known that thermal residual stress in particulate ceramics results from the mismatch of thermal expansion coefficients of particulates and matrix and contributes to toughening of ceramic composites. In this study, alumina-zirconia composites with agglomerated structures were prepared using alumina or alumina-zirconia powder to obtain large-sized compressive zones in particulate ceramics without degrading flexural strength. Agglomerated powder was obtained by pre-sintering. Then several samples used different fraction and size of agglomerated powder were prepared by pressureless sintering. Microstructure and crack paths of prepared samples were examined by scanning electron microscopy (SEM)
flexural strength and fracture toughness of samples were evaluated by four-point flexural test and controlled surface flow method, respectively. Alumina-rich agglomerated structures and a zirconia-rich matrix were formed in samples that were produced using pre-sintered powder. Addition of zirconia to pre-sintered alumina powder prevented coarsening of alumina grains in agglomerated structures. Grain coarsening and cracking caused the decrease in flexural strength of samples with agglomerated structures. Agglomerated structures enhanced fracture toughness. In particular, a specimen using 21.1 vol% of pre-sintered alumina-rich powder of 32 to 150 μm exhibited increase in fracture toughness by approximately 30% without sacrificing average flexural strength. A SEM observation of crack paths showed that grain bridging did not occur in samples. Thereby, we inferred that the compressive residual stress zone in agglomerated structures played an important role in raising fracture toughness.
Japan Institute of Metals (JIM), English, Scientific journal
DOI：https://doi.org/10.2320/matertrans.44.1571
DOI ID：10.2320/matertrans.44.1571, ISSN：1345-9678, eISSN：1347-5320, CiNii Articles ID：10011913999, SCOPUS ID：0141991929, Web of Science ID：WOS:000185315300014 - Proposal of a new analytical procedure for transverse lamina cracking in multidirectionally laminated composites
Kageyama, K; Kato, T; Abe, S
Journal of the Japan Society for Composite Materials(Japan), Volume：28, Number：1, First page：11, Last page：20, 2002
Scientific journal
ORCID：129389405 - Elastic wave from fast heavy ion irradiation on solids
Kambara, T; Kageyama, K; Kanai, Y; Kojima, TM; Nanai, Y; Yoneda, A; Yamazaki, Y
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume：193, Number：1-4, First page：371, Last page：375, 2002
North-Holland, Scientific journal
ORCID：129389346 - Influence of thermal cycling on fatigue strength of Cu/Sn/Cu solder joints
Kato, H; Masaki, T; Kageyama, K
Materials science and technology, Volume：17, Number：10, First page：1306, Last page：1312, 2001
Taylor \& Francis, Scientific journal
ORCID：129389386 - Relationship between Ultrasonic Parameters and Local Strain in Plastically Deformed Brass Plates
Kato, H; Itoi, N; Kageyama, K
JOURNAL OF JSNDI, Volume：50, Number：1, First page：34, Last page：40, 2001
JAPANESE SOCIETY FOR NON-DESTRUCTIVE INSPECTION, Scientific journal
ORCID：129389369 - National Institute of Advanced Industrial Science and Technology
Hayashi, S
unpublished research, 2001
Scientific journal
ORCID：129389364 - SHORT ULTRASONIC PULSE FROM FAST HEAVY-ION IMPACT ON METALS
KAMBARA, Tadashi; KANAI, Yasuyuki; others
Atomic collision research in Japan, Volume：26, First page：103, Last page：105, 2000
Scientific journal
ORCID：129389410 - The Nondestructive Evaluation of Crack Nucleation and Propagation of PZT Using Piezoelectric Signals
Kageyama, K; Kato, H; Matsunaga, Y
BOOK-INSTITUTE OF MATERIALS, Volume：749, First page：43, Last page：50, 2000
INSTITUTE OF MATERIALS, Scientific journal
ORCID：129389350 - Acoustic emission from fast heavy-ion irradiation on solids
Kambara, T; Kanai, Y; Kojima, TM; Nakai, Y; Yoneda, A; Kageyama, K; Yamazaki, Y
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Volume：164, First page：415, Last page：419, 2000
North-Holland, Scientific journal
ORCID：129389387 - Influence of solder thickness on interfacial structures and fatigue properties of Cu/Sn/Cu joints
Kato, H; Horikawa, S; Kageyama, K
Materials science and technology, Volume：15, Number：7, First page：851, Last page：856, 1999
Taylor \& Francis, Scientific journal
ORCID：129389398 - ACOUSTIC EMISSION FROM FAST HEAVY-ION IRRADIATION ON SOLIDS
KOJIMA, TM; KAGEYAMA, K; others
Atomic collision research in Japan, Volume：25, First page：58, Last page：60, 1999
Scientific journal
ORCID：129389388 - Effect of metallic oxides containing composite electrodes on crystallization and ferroelectric properties of Pb (Zr0. 52, Ti0. 48) O3 thin films deposited by the sol-gel method
Doi, Hidekazu; Kageyama, Kensuke
Journal of sol-gel science and technology, Volume：16, First page：21, Last page：27, 1999
Kluwer Academic Publishers, Scientific journal
ORCID：129389377 - Influence on crack nucleation and propagation on the piezoelectric properties of PZT
Kageyama, Kensuke; Kato, Hiroshi; Hatamoto, Takashi; Asanuma, Takaharu
Nippon Kinzoku Gakkaishi (1952), Volume：63, Number：10, First page：1231, Last page：1237, 1999
Scientific journal
ORCID：129389373 - Influence on crack nucleation and propagation on the piezoelectric properties of PZT
Kageyama, Kensuke; Kato, Hiroshi; Hatamoto, Takashi; Asanuma, Takaharu
Nippon Kinzoku Gakkaishi (1952), Volume：63, Number：10, First page：1231, Last page：1237, 1999
Scientific journal
ORCID：129389349 - Evaluation of Mechanical Properties of Sintered Alumina with Recycling Powder
KAGEYAMA Kensuke; KATO Hiroshi; OHI Kenzi; KOBAYASHI Susumu
Journal of the Ceramic Society of Japan, Volume：107, Number：1245, First page：482, Last page：486, 1999, [Reviewed]
Recycling alumina powder was used to prepare sintered alumina. Virgin alumina samples were fabricated by atmospheric sintering and were crushed into powder under 500 μm in grain size by thermal shock treatment and automatic mortar crushing. Then, the crushed alumina powder was mixed with virgin alumina powder and was subjected to re-sintering to renewed alumina. The renewed alumina samples were subjected to four-point bending test and SEM observation of microstructure. Relative density and bending strength of renewed alumina decreased as the volume fraction of recycled alumina powder increased. Samples over 200 MPa of average bending strength, however, were obtained by mixing 50 vol% recycled alumina powder with grain size<32 μm, which was much larger than that of virgin alumina powder. SEM observation indicated that pore distribution was inhomogeneous and pores were located along large polycrystal grain boundaries. Pores, consequently, formed cracks which markedly decreased bending strength. Furthermore, 10 vol%-glass containing renewed alumina samples were fabricated by a procedure similar to that of monolithic alumina. These samples showed higher bending strength than monolithic renewed alumina.
The Ceramic Society of Japan, Japanese
DOI ID：10.2109/jcersj.107.482, ISSN：0914-5400, CiNii Articles ID：110002289764, CiNii Books ID：AN10040326 - Chemical reaction assisted transient liquid phase bonding of alumina in combination with cold isostatic pressing
H Kato; K Kageyama
MATERIALS SCIENCE AND TECHNOLOGY, Volume：14, Number：7, First page：712, Last page：718, Jul. 1998, [Reviewed]
A new method of transient liquid phase (TLP) bonding of alumina specimens has been developed rising a mixture of aluminium powder and silica powder as insert materials. A chemical reaction of aluminium with silica occurs in the interlayer to produce alumina and silicon. Some of the specimens were subjected to cold isostatic pressing (cipping) before bonding to improve the bonding strength. Specimens with an interlayer of powder mixture were joined for Al/SiO2 ratios of 1:0.84 and 1:0.42, but did not join for an interlayer with a theoretical ratio of 1:167. When specimens were subjected to cipping before bonding, bonds were far stronger than bonds without cipping in a temperature range from room temperature to elevated temperatures above the melting point of aluminium. In the mechanical test (bending test), fracture occurs at the boundary between the alumina matrix and the interlayer at room temperature, and in the interlayer at temperatures above the melting point of aluminium. MST/3817.
INST MATERIALS, English, Scientific journal
ISSN：0267-0836, Web of Science ID：WOS:000075075000014 - Strength Test Methods for Polymer based Composite Materials- VI-Fracture Toughness Test method
Kageyama, K
Journal of the Japan Society for Composite Materials(Japan), Volume：24, Number：6, First page：205, Last page：211, 1998
Scientific journal
ORCID：129389401 - Numerical simulation of toughening by crack deflection and bowing of ellipsoidal particle dispersed glass matrix composites
K Kageyama; H Kato
JOURNAL OF THE JAPAN INSTITUTE OF METALS, Volume：61, Number：4, First page：291, Last page：297, Apr. 1997, [Reviewed]
A numerical simulations of crack bowing and deflections was performed on glass matrix-alumina particulate composite to evaluate relationship between the aspect ratio of the ellipsoidal particle and the toughening by crack bowing and crack deflections. Three models of the crack extension process were set up. First, only crack bowing occurs (bowing model); secondly, only crack deflection occurs (deflection model); and thirdly, both of them occur (mixture model). The numerical simulation revealed that in the case of the bowing model, the fracture toughness of composites increased monotonously with the fracture toughness of the particle but in the case of sphere particle dispersed glass and the deflection mixture models, it increased by 30% at most.
Then, the fracture toughness of the composites whose aspect ratios were changed from 0.2 to 5 was calculated. The fracture toughness of the composites in the bowing model was almost unchanged from that of the sphere particle dispersed composites. Meanwhile, when the major axis of ellipsoidal particles was normal to the crack plain, the toughening of the composites in the deflection and mixture models became higher than those of the sphere particles dispersed composites as the particle is inhomogenized. Nevertheless, when the major axis of ellipsoidal particles was parallel to the crack plain, the fracture toughness of the composites was lower than that of the sphere particle dispersed composites and thus the fracture toughness of the composites was also inhomogenized as the particle was inhomogenized.
JAPAN INST METALS, Japanese, Scientific journal
ISSN：0021-4876, eISSN：1880-6880, Web of Science ID：WOS:A1997XD26400006 - Introduction to mechanics of composite materials. V. Preliminaries of fracture mechanics of composite materials
Kageyama, K
Journal of the Japan Society for Composite Materials(Japan), Volume：22, Number：5, First page：193, Last page：199, 1996
Scientific journal
ORCID：129389359 - Numerical simulation of toughening by crack deflection and bowing of glass matrix-alumina particulate composite
K Kageyama; M Enoki; T Kishi
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：103, Number：12, First page：1251, Last page：1257, Dec. 1995, [Reviewed]
A numerical simulation of crack bowing and deflection was performed on glass matrix-alumina particulate composite to evaluate the effects on these toughening mechanisms of composite and was compared with the experimental data of previous works by the authors. The numerical simulation revealed that a crack deflection was predominant in the fracture process of glass matrix-alumina particulate composite and that the crack bowing hardly emerged. If it is assumed that the crack extended into an alumina particle, the crack bowing emerges. With an increase in the difference of the fracture toughness between the particles and the matrix, the toughening by crack bowing becomes more effective and is more effective than that by crack deflection. Under the assumption that the interfacial precipitation promotes the crack bowing, the results of the numerical simulation were in agreement with experimental data of the present authors.
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, English, Scientific journal
DOI：https://doi.org/10.2109/jcersj.103.1251
DOI ID：10.2109/jcersj.103.1251, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:A1995TL95100009 - Mechanical properties of alumina particulate and platelet-reinforced glass composites with a crystalline phase at the interface
Kensuke Kageyama; Manabu Enoki; Teruo Kishi
Journal of the Ceramic Society of Japan. International ed., Volume：103, Number：3, First page：208, Last page：212, Mar. 1995
Alumina particulate and platelet-reinforced glass matrix composites with an anorthite phase precipitated at the interface were fabricated by hot pressing. In order to evaluate the mechanical properties of the materials, four-point bending tests in air and in vacuum, and indentation fracture tests in air were performed. The acoustic emission (AE) signals of the alumina particulate glass composite were measured during bending tests in air. The relative density and the elastic modulus of the samples sintered by hot pressing were higher than those of the samples sintered under atmospheric pressure. The bending strength of the samples with larger amount of precipitated phase decreased compared with that of the samples without precipitation both for tests in air and in vacuum due to coarse precipitation but there was a monotonic increase of fracture toughness because of the interfacial precipitation. SEM observation of the crack paths indicated that the crack propagated through the precipitated phase. The results of AE location were related to the bending strength behavior of the particulate samples.
Fuji Marketing Research Co Ltd, English, Scientific journal
ISSN：0912-9200, SCOPUS ID：0029266240 - MECHANICAL-PROPERTIES OF ALUMINA PARTICULATE AND PLATELET-REINFORCED GLASS COMPOSITES WITH A CRYSTALLINE PHASE AT THE INTERFACE
K KAGEYAMA; M ENOKI; T KISHI
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Volume：103, Number：3, First page：205, Last page：210, Mar. 1995, [Reviewed]
Alumina particulate and platelet-reinforced glass matrix composites with an anorthite phase precipitated at the interface were fabricated by hot pressing. In order to evaluate the mechanical properties of the materials, four-point bending tests in air and in vacuum, and indentation fracture tests in air were performed. The acoustic emission (AE) signals of the alumina particulate glass composite were measured during bending tests in air. The relative density and the elastic modulus of the samples sintered by hot pressing were higher than those of the samples sintered under atmospheric pressure. The bending strength of the samples with larger amount of precipitated phase decreased compared with that of the samples without precipitation both for tests in air and in vacuum due to coarse precipitation but there was a monotonic increase of fracture toughness because of the interfacial precipitation. SEM observation of the crack paths indicated that the crack propagated through the precipitated phase. The results of AE location were related to the bending strength behavior of the particulate samples.
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI, English, Scientific journal
DOI：https://doi.org/10.2109/jcersj.103.205
DOI ID：10.2109/jcersj.103.205, ISSN：1882-0743, eISSN：1348-6535, Web of Science ID：WOS:A1995RD46200001 - EFFECT OF 2ND-PHASE PARTICLES ON MICROFRACTURE PROCESS IN CERAMIC PARTICULATE GLASS MATRIX COMPOSITE
K KAGEYAMA; M ENOKI; T KISHI; K IKUINA; M KIMURA
JOURNAL OF THE JAPAN INSTITUTE OF METALS, Volume：59, Number：2, First page：140, Last page：144, Feb. 1995, [Reviewed]
Ceramics particulate glass matrix composites are attracting attention as materials for highly dense multilayered substrates. The low fracture strength and toughness of glass, however, present a problem. The influence of several dispersed particles on microfracture therefore was studied for ceramic particulate glass matrix composites. The four-point bending and fracture toughness (SEPB) tests were carried out in vacuum, air and water, and the AE was measured at the four-point bending test and analyzed one dimensional AE location. As results, the microfracture process was changed, depending on the thermal expansion and the elastic modulus of dispersed particles. For alumina particulate glass matrix composites, the microcracking did not occur after the final fracture, because microcracks already occurred during the fabrication due to the thermal expansion mismatch between dispersed particles and glass matrix. For cordierite and silica glass particulate glass matrix composites, on the other hand, adequate microcrackings (100-200 AE events) occurred at loading and the microcrack toughening enhanced. Furthermore, the microcrack toughening did not improve the average bending strength, but the scatter of bending strength decreased significantly.
JAPAN INST METALS, English, Scientific journal
ISSN：0021-4876, eISSN：1880-6880, Web of Science ID：WOS:A1995QW00400004 - 界面結晶を析出させたアルミナ粒子又はプレートレツト分散ガラス基複合材料の力学的特性
蔭山健介; 榎学; 岸輝雄
Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌), 1995
Scientific journal
ORCID：129389384 - Numerical Simulation of Toughening by Crack Deflection and Bowing of Glass Matrix-Alumina Particulate Composite.
蔭山健介; 榎学; 岸輝雄
日本セラミックス協会学術論文誌, Volume：103, Number：12, 1995, [Reviewed]
ISSN：0914-5400, J-Global ID：200902193405259723 - EVALUATION OF MICROFRACTURE DUE TO STRESS CORROSION OF PARTICULATE GLASS COMPOSITE BY ACOUSTIC EMISSION
K KAGEYAMA; M ENOKI; T KISHI
NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VI, First page：263, Last page：270, 1994, [Reviewed]
PLENUM PRESS DIV PLENUM PUBLISHING CORP, English, International conference proceedings
Web of Science ID：WOS:A1994BC23T00033 - CONTROLLING PROPAGATION OF MICROFRACTURES BY ANORTHITE CRYSTAL PRECIPITATION IN ALUMINA PARTICULATE GLASS COMPOSITE
K KAGEYAMA; M ENOKI; T KISHI; K IKUINA; M KIMURA
JOURNAL OF THE JAPAN INSTITUTE OF METALS, Volume：57, Number：7, First page：756, Last page：760, Jul. 1993, [Reviewed]
The relationship between the effect of crystallization by anorthite and mechanical properties was investigated by the 4-points bending test and fracture toughness testing (SEPB) in alumina particulate glass composite. PbO-borosilicate glass and CaO-borosilicate glass composite were prepared and crystallized in the interface between glass and alumina or particulate by anorthite and alumina. As crystallized, the bending strength decreased in vacuum because of the initial defects, and increased in air and water because of a decrease of the stress corrosion. On the other hand, the bending strength decreased in all environment where the glass is particulate by anorthite and alumina. By using the AE method, in the noncrystallized specimens, even particulate by anorthite, it was found that the microcrack extended rapidly because of stress corrosion if one microcrack processed. However, if the crystallization occur in the interface between glass and alumina, the crack extension stopped, leading to an increase of the bending strength. Because fracture toughness increased in all environment by the crystallization treatment, it was demonstrated to control the microfracture by crystallization and hence develop the method to obtain the material having the higher reliability in both air and water.
JAPAN INST METALS, Japanese, Scientific journal
ISSN：0021-4876, eISSN：1880-6880, Web of Science ID：WOS:A1993LP50900005 - NUMERICAL-SIMULATION OF FORMATION PROCESS OF TRANSFORMED ZONE AND R-CURVE BEHAVIOR IN PARTIALLY-STABILIZED ZIRCONIA
K KAGEYAMA; M ENOKI; T KISHI
JOURNAL OF THE JAPAN INSTITUTE OF METALS, Volume：56, Number：7, First page：764, Last page：769, Jul. 1992, [Reviewed]
Numerical simulation of the shape and width of the transformed zone and R-curve behavior in partially stabilized zirconia was carried out. The toughening mechanism by transformation has been theoretically studied by McMeeking et al. However, the result by their model is not coincident with the experimental data in Ce-TZP by Yu et al. because they assumed that the transformation volume fraction is low and the stress field is generated only from the main crack tip. In this paper, we assume that the stress filed is generated from both main crack tip and transformed particles, and that the transformation distribution is discontinuous by each particle. As a result, we have two formation processes of the transformed zone. In the case of the low transformation volume fraction, the R-curve behavior agrees with the analysis by McMeeking et al. and the width of the transformed zone with crack extension is almost constant. In the case of the high fraction, however, the transformed zone extends and elongates along the crack tip, and the shape changes and the width of the transformed zone extends discontinuously. It demonstrates a step-like R-curve behavior.
JAPAN INST METALS, Japanese, Scientific journal
ISSN：0021-4876, eISSN：1880-6880, Web of Science ID：WOS:A1992JF68200005 - Computer Simulation of the Growth of Ni on a Ni (111) Surface
Kaneko, Takeo; Kageyama, Kensuke; Sasaki, Tsutomu; Yamamoto, Ryoichi
Japanese Journal of Applied Physics, Volume：28, Number：10R, First page：1900, Last page：1900, 1989
IOP Publishing, Scientific journal
ORCID：129389338
- エレクトレットAEセンサを用いた植物の活動モニタリング—Activity Monitoring of Living Plants Using Electret AE-sensor—特集 適用範囲が広がるエレクトレット技術
蔭山 健介
Volume：46, Number：2, First page：60, Last page：64, Mar. 2022
Japanese
ISSN：0386-2550, CiNii Books ID：AN00128613 - Performance Evaluation of Flexible Electret Sensor Array for Ultrasonic Object Detection in Short Distance
Kensuke Kageyama; Tsubasa Okawa; Takenobu Sakai
2018 IEEE 7TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE 2018), First page：824, Last page：825, 2018
Ultrasonic object detection in short distance could contribute the monitoring of human life activity and remote operation of home appliances. In this study, Ultrasonic sensor array using flexible electret elements were fabricated to detect objects in short distance. The reflection waves were clearly detected at short distance. The object (PVC pipe) detection was examined using the ultrasound generated by the ECS array. The estimated distance was good agreement with the true value though large errors were observed for the estimated angles because only three receivers were used for ECS array.
IEEE, English
ISSN：2378-8143, Web of Science ID：WOS:000459859500291 - Effect of temperature and strain rate on damage accumulation behavior of unidirectional CFRP
Takenobu Sakai; Satoru Abe; Kensuke Kageyama
33rd Technical Conference of the American Society for Composites 2018, Volume：1, First page：439, Last page：444, 01 Jan. 2018
© Copyright© (2018) by DEStech Publications, Inc. All rights reserved. Carbon Fiber reinforced plastics (CFRP) is consisted with the carbon fiber and matrix resin. It has reported to consider that the matrix resin's properties also depends on CFRP's mechanical properties in the recent research. Matrix resin's considerable mechanical property is viscoelasticity that depends on time and temperature. In this study, we focused on the effect of temperature and strain rate on the damage accumulation behavior of unidirectional CFRP laminate, and tensile tests with acoustic emission technique were carried out at three different temperature with three different strain rate. As the results of tensile tests, lower temperature and higher strain rate showed higher tensile strength, that is, it is understood that tensile strength depended on the matrix's viscoelastic properties. Crack initiation behavior, which was defined at the point of rapid increase in cumulative AE energy, was depended on the temperature and strain rate. To understand the details of AE information, the frequency analysis was done. In the frequency analysis, the resonant frequency of AE sensors effects on the frequency properties of the detected signals, so we tried to erase the effect of sensors by deconvolution of AE sensor's frequency properties from detected signals. As the results of deconvolution, we could distinguished the failure modes as matrix cracking, fiber/matrix interfacial debonding and fiber breaking. Using these results, matrix cracking, fiber/matrix interfacial debonding were effected by temperature and strain rate, however, fiber breaking was not affected. Consequently, the crack accumulation behavior of each failure mode depended on the temperature and strain rate as the same tendency of matrix's viscoelastic properties.
SCOPUS ID：85059307841 - AE Measurement Approach for Activity Monitoring of Foliage Plants
Kensuke Kageyama; Kazuyuki Kojima; Takehiro Nakamura
2017 IEEE 6TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE), 2017
AE measurements of foliage plants were examined for the activity monitoring. The electret condenser sensor (ECS) could detect many AE events mainly in daytime at stem of Schefflera and Olive tree. AE behaviors of these plants were strongly influenced by the drought stress Number of detected AE also largely fluctuated by the weather conditions. As a result, AE method could be useful approach to enhance healing effect of foliage plants by visualization of the activity change of the plants.
IEEE, English
ISSN：2378-8143, Web of Science ID：WOS:000426994600106 - CFRP の損傷蓄積挙動に及ぼすひずみ速度の影響
坂井建宣; 安部聡; 上田政人; 小林訓史; 荻原慎二; 若山修一; 蔭山健介
Number：論文番号OS16-09, Oct. 2016
Japanese - 廃タイヤのリサイクルのためのポリ乳酸複合材料の創製
坂井建宣; 川井喬介; 立山耕平; SOBERANIS C‐R Rios; RODROGUEZ‐LAVIADA J; PEREZ‐PACHECO E; 川田良暁; 蔭山健介; 山田浩之
日本実験力学会講演論文集, Number：15, First page：160, Last page：162, 28 Aug. 2015
Japanese
ISSN：1346-4922, J-Global ID：201502214381674550 - 超音波AEを用いた植物のストレス応答測定 : 乾燥ストレス変動が植物茎部での超音波AE発生挙動に及ぼす影響 (特集 超音波技術で測る)
蔭山 健介
Volume：27, Number：4, First page：6, Last page：9, Jul. 2015
Japanese
ISSN：0916-2410, CiNii Articles ID：40020544104, CiNii Books ID：AN10068970 - 周波数解析による変形性膝関節症の診断
坂井建宣; 児玉勝也; 川田良暁; 蔭山健介; 戸沢優介; 長谷和徳; 若山修一; 安藤聡子; 中村拓也; 太田進
応力・ひずみ測定と強度評価シンポジウム講演論文集, Volume：46th, First page：1, Last page：5, 10 Jan. 2015
Japanese
J-Global ID：201502208076131669 - OS0718 Influence of Irradiation Angle and Surface Roughness on Surface Reflection Characteristics
KATO Hiroshi; SAWABE Takeshi; KAGEYAMA Kensuke
Volume：2012, First page："OS0718, Last page：1"-"OS0718-2", 22 Sep. 2012
The ultrasonic wave was irradiated on the surface of the glass and aluminum alloy specimens at different incident angles, and the back reflection from the surface was obtained. When the ultrasonic wave was irradiated on the mirror finished surface of the glass, the surface reflection profile showed the complex change, and the intensity was decreased with increasing irradiation angle. When the ultrasonic wave was irradiated on the polished surface of the aluminum alloy plate, the reflection intensity was decreased with decreasing surface roughness with slight fluctuation.
The Japan Society of Mechanical Engineers, Japanese
CiNii Articles ID：110009937338, CiNii Books ID：AA12322087 - 1304 Effect of Mold Size on Initial Solidification from Zn-2mass%Al Alloy Substrate
Kaneko Hiroshi; Kato Hiroshi; Kageyama Kensuke
Volume：2012, Number：18, First page：413, Last page：414, 08 Mar. 2012
The Zn-2mass%Al alloy installed in a tubular mold of different inner diameters (the specimen diameter) was solidified from the substrate in the temperature gradient. With decreasing specimen diameter, the transition from the planar growth to the columnar growth occurred in the shorter period during furnace cooling. However, when the specimen diameter decreased to 0.1mm, there were two transition periods: the early transition and the delayed transition. It was thought that the smaller specimen diameter restricted the perturbation behavior of the interface to change the stability condition of the interface, and caused the split of the transition period.
The Japan Society of Mechanical Engineers, Japanese
CiNii Articles ID：110009955390, CiNii Books ID：AA11902161 - 205101 Ultrasonic measurement of plated aluminum alloy specimen under fatigue testing
KITAMI Kouji; KATO Hiroshi; KAGEYAMA Kensuke
Volume：2011, Number：17, First page：131, Last page：132, 17 Mar. 2011
The ultrasonic measurement of the surface propagating wave (SPW) was carried out under fatigue testing with aluminum alloy specimens with / without a plated layer. The surface waveform was changed with increasing damage in the path of the APW, and when the fracture occurred in the path of the SPW, the wave intensity was decreased in the final stage of the fatigue life. In case of the specimen with the plated layer, the frequency of the SPW shifted to the higher frequency range with increasing number of fatigue cycles.
The Japan Society of Mechanical Engineers, Japanese
CiNii Articles ID：110009663784, CiNii Books ID：AA11902161 - アルミニウム合金複合材中に内在する鋳造欠陥の超音波検出
大塚 翔太; 加藤 寛; 蔭山 健介
Volume：158, First page：53, Last page：53, 2011
Japanese
DOI：https://doi.org/10.11279/jfeskouen.158_53
DOI ID：10.11279/jfeskouen.158_53, CiNii Articles ID：130005400847 - Zn-2mass%Al合金の初期凝固組織に及ぼす鋳型寸法の影響
金子 洋; 加藤 寛; 蔭山 健介
Volume：158, First page：102, Last page：102, 2011
Japanese
DOI：https://doi.org/10.11279/jfeskouen.158_102
DOI ID：10.11279/jfeskouen.158_102, CiNii Articles ID：130005400872 - アルミニウム合金複合材鋳物の疲労損傷過程の超音波評価
大塚 翔太; 加藤 寛; 蔭山 健介
Volume：159, First page：90, Last page：90, 2011
Japanese
DOI：https://doi.org/10.11279/jfeskouen.159_90
DOI ID：10.11279/jfeskouen.159_90, CiNii Articles ID：130005401026 - 埼玉大学 大学院理工学研究科 人間支援・生産科学研究部門材料工学研究室
加藤 寛; 蔭山 健介
Volume：10, Number：4, First page：459, Last page：459, 25 Dec. 2010
Japanese
ISSN：1346-4930, CiNii Articles ID：10027693097, CiNii Books ID：AA11822914 - ハイブリッドセンシングによる草本植物のアコースティック・エミッション発生因子の解明と水分状態診断への応用
蔭山 健介
Number：5(18年度), First page：670, Last page：671, 2007 - ハイブリッドセンシングによる草本植物のアコースティック・エミッション発生因子の解明と水分状態診断への応用
蔭山 健介
総合研究機構研究プロジェクト研究成果報告書, Number：5(18年度), First page：670, Last page：671, 2007 - Topographical mapping of surface and interface profiles by using acoustic interferometry
Hiroshi Kato; Satoru Ohmura; Satoru Toyooka; Yoshiaki Kawada; Kensuke Kageyama
MATERIALS TRANSACTIONS, Volume：47, Number：6, First page：1572, Last page：1576, Jun. 2006
The model is presented to explain formation of interference fringes appearing in acoustic images obtained by the acoustic microscopy. In the model, the residual vibration in the vibrator is overlapped by the vibration due to the ultrasonic wave reflected from the surface of the solid. The model was confirmed by the periodical change in the output of the vibrator with the water path. Then acoustic images of an inclined glass plate were observed to examine the influence of the inclination angle, the focal position and the wave frequency on the fringe spacing. A height difference corresponding to the fringe spacing was about a half wavelength of the ultrasonic wave in water. The interference fringes were also observed with a specimen with a deep notch under bending test and showed a good agreement with moire fringes. The presented model suggests that the interference fringes are also formed corresponding to profiles of a reverse surface and a boundary between dissimilar substances. This was confirmed by acoustic images of copper plates with a tapered edge and a shallow groove on the reverse surface, and also those of a copper plate with a dint on the reverse surface, covered by tin alloy solder.
JAPAN INST METALS, English
DOI：https://doi.org/10.2320/matertrans.47.1572
DOI ID：10.2320/matertrans.47.1572, ISSN：1345-9678, eISSN：1347-5320, CiNii Articles ID：10018160684, Web of Science ID：WOS:000239650700028 - Acoustic visualization of cold flakes and crack propagation in aluminum alloy die-cast plate
AKMA Ahamed; H Kato; K Kageyama; T Komazaki
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, Volume：423, Number：1-2, First page：313, Last page：323, May 2006
Acoustic images received at different depths of aluminum alloy (ADC12) die-cast plates containing coarse cold flakes were compared with microstructures at the same depth. The bright and dark regions in the acoustic images coincided with the oxide layer on the initially solidified surface of the cold flake and the body of the cold flake, respectively. These results show the ability of nondestructive detection of cold flakes by the ultrasonic microscopy. The specimens were then fabricated to contain the cold flake at a center, and subjected to three-point bending test. When the coarse cold flake existed apart from the tensile side surface of the specimen, a crack initiated at a small cold flake on the side surface and propagated in the specimen. In this case the bending strength was almost the same as the tensile strength (285 MPa) of the die-cast plate. When the cold flake existed on the tensile side surface or at a position less than 0.5 mm inside the surface, the crack propagated along the oxide layer of the cold flake. In this case, the bending strength decreased from the tensile strength when the cold flake approached the side surface. A relation between the bending strength and the position of the cold flake in the specimen was discussed from the standpoint of the fracture mechanics. (c) 2006 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English
DOI：https://doi.org/10.1016/j.msea.2006.02.042
DOI ID：10.1016/j.msea.2006.02.042, ISSN：0921-5093, CiNii Articles ID：120001370901, Web of Science ID：WOS:000237817400055 - ナノPZT 粒子分散層と絶縁コーティングカーボンクロス層により形成された自己診断積層CFRP の開発<論文>
蔭山 健介
Volume：39, First page：9, Last page：14, 2006 - ナノＰＺＴ粒子分散層と絶縁コーティングカーボンクロス層により形成された自己診断積層のＣＦＲＰの開発
蔭山 健介
Number：4(17年度), 2006 - 鉛フリーはんだ接合材における疲労き裂の音響可視化
加藤 寛; 小林寛嗣; 蔭山健介
Volume：45, Number：1, First page：223, Last page：336, 2006
Japanese
ISSN：1347-7234, CiNii Articles ID：40007432569, CiNii Books ID：AA11995570 - Influence of Overaging on Fatigue Strength and Ultrasonic Parameters of Aluminum Alloy A2024-T3
MIN Xiao-Hua; KATO Hiroshi; WATANABE Naoki; KAGEYAMA Kensuke
Journal of the Japanese Society for Experimental Mechanics, Volume：6, Number：3, First page：282, Last page：288, 2006
The aluminum alloy A2024-T3 was overaged at 573 K for different aging times, and then subjected to the hardness measurement and the fatigue testing. The hardness decreased successively with increasing aging time, but the fatigue life largely decreased to a half of the initial life after aging for 2 h or longer. The ultrasonic measurement was carried out with overaged specimens to examine changes in ultrasonic parameters with the aging time. The peak intensity (PI) gradually decreased with increasing aging time, but the average gradient of the transfer function (AGTF) largely decreased and became almost constant after aging for 2 h or longer. The ultrasonic measurement was also carried out in-process during the fatigue testing by using the water bag. The ultrasonic parameters (PI and AGTF) increased with the number of fatigue cycles (N) with considerable scatter, and the average rate of AGTF in the fatigue process (d(AGTF)/dN) increased with the aging time up to 4 h.
The Japanese Society for Experimental Mechanics, English
DOI：https://doi.org/10.11395/jjsem.6.282
DOI ID：10.11395/jjsem.6.282, ISSN：1346-4930, CiNii Articles ID：10018779779, CiNii Books ID：AA11822914 - Influence of Receiver Plate on the Sensitivity for AE Measurement of Tomato Using Piezoelectric Sensor
K. Kageyama; H. Kato
First page：359, Last page：366, 2006 - ナノPZT 粒子分散層と絶縁コーティングカーボンクロス層により形成された自己診断積層CFRP の開発<論文>
蔭山 健介
埼玉大学紀要, 工学部, 第1部論文集, Volume：39, First page：9, Last page：14, 2006
CFRP laminates specimens with Nano-PZT particulate epoxy resin layers and insulating coating carbon layers were prepared. Two types of insulating coating were examined and one liquid type epoxy adhesive showed excellent insulation of carbon layers. CFRP laminates specimens suffered tensile or fatigue testing and signals of electric current generated by hitting specimens were measured simultaneously. The electric signal tended to increase with loading or fatigue cycles and sudden increase in the signals coincided to the occurrence of delamination between epoxy matrix and carbon layers. Tensile testing showed that the addition of PZT particles upgrade the increase in the electric signals due to delaminations. On the other hand, fatigue testing showed that the influence of the addition of PZT particles on the electric signal behavior was small.
Japanese
ISSN：1880-4446, CiNii Articles ID：120001370409 - ナノＰＺＴ粒子分散層と絶縁コーティングカーボンクロス層により形成された自己診断積層のＣＦＲＰの開発
蔭山 健介
総合研究機構研究プロジェクト研究成果報告書, Number：4(17年度), 2006 - 鉛フリーはんだ接合材における疲労き裂の音響可視化
加藤 寛; 小林寛嗣; 蔭山健介
銅及び銅合金, Volume：45, Number：1, First page：223, Last page：336, 2006
Japanese
ISSN：1347-7234, CiNii Articles ID：40007432569, CiNii Books ID：AA11995570 - Influence of Overaging on Fatigue Strength and Ultrasonic Parameters of Aluminum Alloy A2024-T3
X.H. Min; H. Kato; N. Watanabe; K. Kageyama
Journal of JSEM, Volume：6, Number：3, First page：282, Last page：288, 2006
The aluminum alloy A2024-T3 was overaged at 573 K for different aging times, and then subjected to the hardness measurement and the fatigue testing. The hardness decreased successively with increasing aging time, but the fatigue life largely decreased to a half of the initial life after aging for 2 h or longer. The ultrasonic measurement was carried out with overaged specimens to examine changes in ultrasonic parameters with the aging time. The peak intensity (PI) gradually decreased with increasing aging time, but the average gradient of the transfer function (AGTF) largely decreased and became almost constant after aging for 2 h or longer. The ultrasonic measurement was also carried out in-process during the fatigue testing by using the water bag. The ultrasonic parameters (PI and AGTF) increased with the number of fatigue cycles (N) with considerable scatter, and the average rate of AGTF in the fatigue process (d(AGTF)/dN) increased with the aging time up to 4 h.
The Japanese Society for Experimental Mechanics, English
DOI：https://doi.org/10.11395/jjsem.6.282
DOI ID：10.11395/jjsem.6.282, ISSN：1346-4930, CiNii Articles ID：10018779779, CiNii Books ID：AA11822914 - Influence of Receiver Plate on the Sensitivity for AE Measurement of Tomato Using Piezoelectric Sensor
Kageyama, K; Kato, H
PROGRESS IN ACOUSTIC EMISSION, Volume：13, First page：359, Last page：359, 2006
ORCID put code：129389392 - 10103 Nondestructive Evaluation of Cracking Process in Aluminum Alloy Die-Casts Containing Cold Flakes
Aziz Ahamed A. K. M.; Kato Hiroshi; Kageyama K.
Volume：2005, Number：11, First page：187, Last page：188, 17 Mar. 2005
Aluminum alloy die-cast plates (ADC12) were subjected to scanning acoustic microcopy measurement for developing a nondestructive method to detect cold flakes in the die-cast. Acoustic images inside the aluminum die-cast specimen were obtained at 0.1mm interval from 0.5mm to 2mm depth, and compared with optical micrographs of cross-sections at the same depth as the acoustic images. The acoustic images of the cold flakes were good agreement with those observed in micrograph. Then the crack appearance inside the specimen was observed through ultrasonic microscopy during the bending test. The crack can easily start from the surface oxide layer or near the surface (0.1mm〜0.3mm inside), when the oxide layer is perpendicular to the applied stress. But no major effect of the oxide layer parallel to the applied stress on the crack initiation even in the near surface. A crack did not initiate from the inside cold flakes.
The Japan Society of Mechanical Engineers, English
CiNii Articles ID：110006205738, CiNii Books ID：AA11902161 - Real-time ultrasonic measurement during tensile testing of aluminum alloys
XH Min; H Kato; N Narisawa; K Kageyama
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, Volume：392, Number：1-2, First page：87, Last page：93, Feb. 2005
A real-time ultrasonic measurement was carried out for aluminum alloy (A2024-T3) specimens during tensile testing with local immersion method by using a water bag to obtain ultrasonic parameters. The sound velocity increased with increasing strain in the elastic deformation, and then decreased with increasing plastic strain during tensile testing. From a relation between the sound velocity and the elastic strain, the acousto-elastic constant was calculated to be 8.5 x 10(-6) MPa-1. The surface roughness and the hardness were measured for specimens taken out from testing machine after required strain. The peak intensity of the bottom echo spectrum and the average gradient of the transfer function (AGTF) obtained from the bottom echo spectrum decreased with increasing plastic strain. The decrease in the ultrasonic parameters was explained from the change in the dislocation density and arrangement by using Granato and Lucke string model. The peak frequency of the bottom echo spectrum did not change with increasing plastic strain. The ultrasonic parameters were measured off-line with specimens taken out from testing machine after required strain by the conventional immersion method, and decreased with increasing plastic strain as those obtained in real-time. When specimens were annealed, the hardness continuously decreased with increasing annealing time, and the yield strength and the sound velocity slightly increased after smaller annealing time, and then decreased with increasing annealing time. For annealed specimens, the peak intensity and AGTF obtained by the real-time measurement also decreased with increasing plastic strain, and the rates of the ultrasonic parameters increased with increasing annealing time. (C) 2004 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English
DOI：https://doi.org/10.1016/j.msea.2004.10.019
DOI ID：10.1016/j.msea.2004.10.019, ISSN：0921-5093, Web of Science ID：WOS:000227139400011 - 1457 Nondestructive Detection and Strength Evaluation of Aluminum Alloy Die-Casts with Casting Defects
Ahamed A.K.M. Aziz; Kato Hiroshi; Kageyama K.
The proceedings of the JSME annual meeting, Volume：2005, First page：331, Last page：332, 2005
Cold flakes, a kind of casting defects, were observed through acoustic microscopy in aluminum alloy die-cast plates (ADC12). Then specimens were prepared and subjected to the tensile test having a cold flake in the middle with different direction, position and shape of cold flakes. The tensile strength of the specimen was decreased when the cold flake was exposed to the side surface and also decreased with increasing size of the cold flake.
The Japan Society of Mechanical Engineers, English
DOI：https://doi.org/10.1299/jsmemecjo.2005.1.0_331
DOI ID：10.1299/jsmemecjo.2005.1.0_331, CiNii Articles ID：110006190330, CiNii Books ID：AA11461871 - PMC-19: Evaluation of Damage and Stress of Woven Carbon Fabric Laminates with Piezoelectric Particulate Epoxy Using Electric Properties(PMC-III: POLYMERS AND POLYMER MATRIX COMPOSITES)
KAGEYAMA K.; YOSHIKAWA T.; KATO H.
JSME Materials and Processing Conference (M&P), Volume：2005, First page：CD-ROM, Last page：11, 2005
The Japan Society of Mechanical Engineers, English
CiNii Articles ID：110006209635, CiNii Books ID：AA11902558 - ナノPZT粒子分散絶縁層により形成された埋め込み型センサを有する自己診断FRPの開発
蔭山 健介
Volume：16年度, 2005 - Evaluation of Damage and Stress of Woven Carbon Fabric Laminates with Piezoelectric Particulate Epoxy Using Electric Properties.
K. Kageyama; T. Yoshikawa; H. Kato
Proceedings of The 2nd JSME/ASME International Conference on Materials and Processing 2005, First page：CD-ROM, 2005 - ナノPZT粒子分散絶縁層により形成された埋め込み型センサを有する自己診断FRPの開発
蔭山 健介
総合研究機構研究プロジェクト研究成果報告書, Volume：16年度, 2005 - Nondestructive detection of cold flakes in aluminum alloy die-cast plate with ultrasonic measurement
H Kato; T Suzuki; Y Annou; K Kageyama
MATERIALS TRANSACTIONS, Volume：45, Number：7, First page：2403, Last page：+, Jul. 2004
Aluminum alloy die-cast plates (ADC 12) were subjected to ultrasonic measurement to obtain a relation between the intensity distribution of the ultrasonic wave and positions of cold flakes appearing in the plate for developing a nondestructive method to detect cold flakes in the die-casts. Die-cast plates of 170 mm in length, 50 mm in width and 6.8 mm in thickness were produced with wider gates to introduce larger cold flakes in the plate. Then the ultrasonic measurement was carried out with the immersion method by using a probe generating a longitudinal wave of 20 MHz in frequency. Intensity distributions of the ultrasonic wave were obtained from the surface to the bottom. The cross section analysis was carried out to examine the distribution of the cold flake. From the cross section analysis, three types of cold flakes were observed: the type A with a straight boundary of initial solidification with oxide thin layer, the type B with a straight boundary without oxide layer, and the type C of an irregular and wavy boundary without oxide layer. In the case of the type C, the oxide layer was thought to be out of the observed section. The ultrasonic wave was slightly reflected from the front and rear boundaries between the cold flake and the matrix, and it was found that the position and the thickness of the cold flake can be detected by ultrasonic measurement.
JAPAN INST METALS, English
DOI：https://doi.org/10.2320/matertrans.45.2403
DOI ID：10.2320/matertrans.45.2403, ISSN：1345-9678, eISSN：1347-5320, CiNii Articles ID：10013337752, Web of Science ID：WOS:000223245300076 - Observation o Cavitation in Leaf Vein of Rubeer Tree Using AE Method
K. Kageyama; K. Higashi; H. Kat
First page：287, Last page：292, 2004 - Ultrasonic evaluation of fatigue damaging process of Cu plates joined with Sn-3.8wt%Ag-1.2wt%Cu alloy solder
ZM Jin; H Kato; K Kageyama
ADVANCES IN NONDESTRUCTIVE EVALUATION, PT 1-3, Volume：270-273, Number：273, First page：1189, Last page：1195, 2004
The lead free Sn-3.8wt%Ag-1.2wt%Cu solder joints were subjected to fatigue testing. In the fatigue testing, the ultrasonic measurement and the acoustic microscopy were carried out to obtain relations among ultrasonic parameters, acoustic images and fracture surfaces at different fatigue cycles. The peak intensity of the Fourier spectrum of the interfacial echo increased with increasing number of the fatigue cycle. Especially at a number of the fatigue cycle greater than 700,000, the peak intensity of the Fourier spectrum rapidly increased to fracture. Comparing the 14 estimated area of the bonded region to the fracture surface of solder joints, the area of the contour map with the intensity of 0.65 similar to 0.7 or higher was in good agreement with that of the bonded region in the fracture surface. Following increasing number of the fatigue cycle, estimated area of bonded region decreased. From images of acoustic microscopy, three different regions of brightness were obtained: a dark region, a bright region and a region changed from dark to bright. Three different regions were compared with SEM observation. The dark region was a region of good bonding, and the fracture surface showed a shear flow pattern. The bright region was a region of poor bonding or no bonding. The region changed from dark to bright was a region where the crack was initiated and propagated, and at the fracture surface, penny shaped cracks appeared.
TRANS TECH PUBLICATIONS LTD, English
ISSN：1013-9826, Web of Science ID：WOS:000223978300194 - Observation o Cavitation in Leaf Vein of Rubeer Tree Using AE Method
K. Kageyama; K. Higashi; H. Kat
Progress in Acoustic Emission XII, The Japanese Society for Non-Destructive Inspection, First page：287, Last page：292, 2004 - Ultrasonic evaluation of fatigue damaging process of lead free-solder joints
金 哲明; 加藤 寛; 蔭山 健介
Volume：2003, Number：9, First page：193, Last page：194, 13 Mar. 2003
The fatigue damaging process on the Cu/Sn-3.8Ag-1.2Cu/Cu solder joints was evaluated through ultrasonic measurment. Copper plates were bonded with Sn-3.8Ag-1.2Cu foil (solder thickness of 60μm) and they were subjected to fatigue testing with a shear stress amplitude of 7.2MPa and 8.5MPa and a frequency of 3.6Hz. The ultrasonic wave reflected from the boundary between the solder layer and the substrate was analyzed to evaluate area of the joined region and bonding character at the joined region. The total area of solder joints was deceased with increasing number of the loading cycle in the fatigue testing, and Fourier spectra of the reflected wave were changed at the joined region.
The Japan Society of Mechanical Engineers, Japanese
CiNii Articles ID：110002496998, CiNii Books ID：AA11902161 - Measurement of Vital Reaction of Spiderwort Suffered Bending Force
加藤 寛; 赤松 義明; 蔭山 健介
Volume：2001, Number：1, First page：137, Last page：140, 30 May 2001
Japanese
CiNii Articles ID：10007535488, CiNii Books ID：AA11592632 - Improvement of Mechanical Properties of Alumina Particulate Composites Using Polycrystarlline Alumina Powder
2001 - Improvement of Mechanical Properties of Alumina Particulate Composites Using Polycrystarlline Alumina Powder
Adavances in Fracture Research, 2001 - Change in Ultrasonic Properties of Wood with Damaging under Compressive Loading
加藤 寛; 奥西 麻衣子; 蔭山 健介
Volume：1999, Number：1, First page：183, Last page：184, 26 May 1999
Japanese
CiNii Articles ID：10002582258, CiNii Books ID：AA11592632 - Toughness and fracture mechanism of particle dispersion glass base composite material.
岸輝雄; 榎学; 蔭山健介
材料強度と破壊総合シンポジウム論文集, Volume：40th, 1995
ISSN：0911-6540, J-Global ID：200902160337470008 - Numerical Simulation of Toughening of Alumina Particulate Glass Matrix Composite by Interfacial Precipitation
Volume：46, First page：765, Last page：776, 1995 - 界面結晶析出による多層基板用ガラスセラミックスの作製と力学的特性評価
蔭山健介; 榎学; 岸輝雄
Volume：114th, 1994
ISSN：1342-5730, J-Global ID：200902159323265969 - 粒子分散ガラス基複合材料のき裂の偏向・湾曲による高靭化の数値解析
蔭山健介; 榎学; 岸輝雄
Volume：115th, 1994
ISSN：1342-5730, J-Global ID：200902162003084789 - 先端材料の力学的特性に及ぼすミクロ組織因子 セラミックス基礎合材料の微視破壊過程の確率論的取り扱い
榎学; 蔭山健介; 岸輝雄
Volume：115th, 1994
ISSN：1342-5730, J-Global ID：200902195914404140 - 1.Environmental effects to microscopic fracture process of ceramics base composite materials.
榎学; 蔭山健介; 岸輝雄
材料強度と破壊総合シンポジウム論文集, Volume：39th, 1994
ISSN：0911-6540, J-Global ID：200902165602354610 - Evaluation of microfracture process in ceramic particulate glass matrix composite by the AE method.
蔭山健介; 榎学; 岸輝雄
日本機械学会材料力学部門講演会講演論文集, Volume：1994-B, 1994
J-Global ID：200902179137940096 - Numerical simulation of toughening of alumina particulate glass matrix composite by interfacial precipitation
Kageyama, K; Enoki, M; Kishi, T
Ceramic Transactions, Volume：46, First page：765, Last page：776, 1994
ORCID put code：129389380 - 界面結晶析出によるセラミックス粒子分散ガラス基複合材料の力学的特性向上
蔭山健介; 榎学; 岸輝雄; 生稲一洋; 木村光
Volume：113th, 1993
ISSN：1342-5730, J-Global ID：200902121972426630 - セラミックス粒子分散ガラス基複合材料の第二相粒子による微視破壊過程の変化
蔭山健介; 榎学; 岸輝雄; 生稲一洋; 木村光
Volume：112th, 1993
ISSN：1342-5730, J-Global ID：200902162281133235 - Evaluation of Mechanical Reliability of Ceramic Particulate Glass Matrix Composite for Multi-layered Substrates by AE Method.
蔭山健介; 榎学; 岸輝雄
アコースティック・エミッション総合コンファレンス論文集, Volume：9th, 1993
J-Global ID：200902192080228447 - アルミナ-ガラス複合材料の結晶化による応力腐食の抑制
蔭山健介; 榎学; 岸輝雄; 生稲一洋; 木村光
Volume：111th, 1992
ISSN：1342-5730, J-Global ID：200902031461950340
■ Lectures, oral presentations, etc.
- INFLUENCE OF DROUGHT STRESS INDUCED BY CUTTING STEM ON AE BEHAVIOR IN MINIATURE TOMATO
2008 - INFLUENCE OF DROUGHT STRESS INDUCED BY CUTTING STEM ON AE BEHAVIOR IN MINIATURE TOMATO
PROGRESS in ACOUSTIC EMISSION, 2008 - 草本植物の種の違いによるAE発生挙動の変化
2007 - 音響測定によるミニトマト茎内部の維管束組織の非破壊評価
2007 - 草本植物の種の違いによるAE発生挙動の変化
第16回アコースティック・エミッション総合コンファレンス論文集, 2007 - 音響測定によるミニトマト茎内部の維管束組織の非破壊評価
日本実験力学会講演論文集, 2007 - 植物の茎部における径変化とAEの同時測定
2006 - Influence of Receiver Plate on the Sensitivity for AE Measurement of Tomato using Piezoelectric Sensor
2006 - 植物の茎部における径変化とAEの同時測定
アコースティックエミッション特別研究委員会，日本非破壊検査協会, 2006 - Influence of Receiver Plate on the Sensitivity for AE Measurement of Tomato using Piezoelectric Sensor
Progress in Acoustic Emission XIII, 2006 - 高速重イオン照射による超音波観測
2005 - Evaluation of Damage and Stress of Woven Carbon Fabric Laminates with Piezoelectric Particulate Epoxy Using Electric Properties.
2005 - 高速重イオン照射による超音波観測
日本物理学会講演概要集, 2005 - Evaluation of Damage and Stress of Woven Carbon Fabric Laminates with Piezoelectric Particulate Epoxy Using Electric Properties.
Proceedings of The 2nd JSME/ASME International Conference on Materials and Processing 2005, 2005 - Observation o Cavitation in Leaf Vein of Rubeer Tree Using AE Method
2004 - Observation o Cavitation in Leaf Vein of Rubeer Tree Using AE Method
Progress in Acoustic Emission XII, 2004
■ Research projects
- 振動防除システムの構築：振動による樹木害虫の検知と行動制御
01 Apr. 2022 - 31 Mar. 2025
Grant amount(Total)：4160000, Direct funding：3200000, Indirect funding：960000
Grant number：22K05661 - Development of activity monitoring of microbes using acoustic emission
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory), Grant-in-Aid for Challenging Research (Exploratory), 30 Jul. 2020 - 31 Mar. 2023
Saitama University
Grant amount(Total)：6370000, Direct funding：4900000, Indirect funding：1470000
Grant number：20K21859 - Development of activity monitoring of living plants using electret AE sensor
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), 01 Apr. 2019 - 31 Mar. 2022
Kageyama Kensuke, Saitama University
Grant amount(Total)：12480000, Direct funding：9600000, Indirect funding：2880000
AE sensor that can adhere even to a complex shaped stem and can detect plant AE was developed and demonstrated that it can detect plant AE regardless of the size and hardness of the stem to which it is attached. Stand-alone AE device combined with solar cells and batteries was developed. Then, IoP device that can measure plant AE anytime and anywhere demonstrated that plant AE can be measured for a long period of time without power supply. Furthermore, by visualizing plant AE occurence behavior and environmental changes, we monitored plant activity and quantified the environmental impact of plants, thereby clarifying the usefulness of activity monitoring using plant AE.
Grant number：19H04280 - Development of printable and flexible ultrasonic-sensor-array using silica-agglomerate electret
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, 01 Apr. 2016 - 31 Mar. 2019
KAGEYAMA Kensuke, Saitama University
Grant amount(Total)：3770000, Direct funding：2900000, Indirect funding：870000
Ultrathin electret less than 4 μm which exhibited high electric charge retention and fine patterned by laser irradiation was obtained using PTFE and silica agglomerates. It is considered that this electret could contribute to the performance improvement of an electret condenser sensor (ECS). On the other hand, an airborne ultrasonic sensor array was fabricated in a cylindrical shape using flexible ECS using a silica aggregate electret and demonstrated the excellent performance in object position detection in omni-directions, especially at a short distance. In addition, it was shown that this ECS can also improve the performance by frequency modulation called pulse compression method.
Grant number：16K14183 - Development of super-wideband electret condensor sensor with flexible dual structure
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 01 Apr. 2012 - 31 Mar. 2015
KAGEYAMA Kensuke, Saitama University
Grant amount(Total)：5330000, Direct funding：4100000, Indirect funding：1230000
Flexible electret condensor sensor (Flexible ECS) was fabricated. As a result, the flexible ECS was obtained and it could be folded. The fabricated ECS could measure a heart sound and detect a ultrasonic AE due to cavitation in living plants. Furthermore, dual sensor with lamination of two elements was fabricated. The dual sensor could measure the hardness of soft materials using transmitting and receiving waveform and center frequency. These results can conclude that a flexible ECS with super-wideband of 1 Hz to 100 kHz could be developed optimizing the shape and structre of the element.
Grant number：24500196 - Development of Measuring Technique of Embolism Density in Herbaceous Plants Using Hybrid Acoustic Sensing
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), 2008 - 2010
KAGEYAMA Kensuke, Saitama University
Grant amount(Total)：5200000, Direct funding：4000000, Indirect funding：1200000
Hybrid acoustic measurement system was fabricated to detect simultaneously the guided wave travelling a stem and the acoustic emission due to cavitation. As a result, the travelling velocity and the attenuation of the guided waves through a stem were deeply related to the structure of the vascular tissue and the water potential of the stem. Embolism density (vulnerability of cavitation) could be evaluated by the hybrid acoustic measurement during irrigation with several sensors. Thereby, the hybrid acoustic measurement enhanced the water use efficiency of a miniature tomato.
Grant number：20580283 - Development of Magnetic Camera Using Hole Sensor and Magnetic Fluid
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), 2000 - 2001
KAGEYAMA Kensuke; SHOUJI Tetsuo; SHIBASAKI Ichiro; KATO Hiroshi, Saitama University
Grant amount(Total)：13300000, Direct funding：13300000
The high sensitivity hole sensor installed in XYZ three axial stage with resolution approximately 100 μ m scaning in three dimensions was assembled on an experimental basis for non-contact measurement of ferromagnetic materials. It measured the magnetic distribution around the steel sheet (the S45C) as a sample in the external magnetic field and the possibility of visualization of the ferromagnet with non- contact measurement was considered. As a result, it was difficult to observe of three dimensional shape of the S45C samples such as change of depth of the samples with conventional technique. In addition, although it is possible to detect the ferromagnetic samples, it was found that detection sensitivity of the penetration hole in the samples decreased rapidly with the increase of distance of the samples and the sensor. Next, the steel sheet (the S45C) and magnetic fluid was as the magnetic lens and was set at the back of the sensor to expect that it could focused the magnetic flux to the sensor. And, when the several types of shape of the magnetic lens was applied to testing, it indicated the possibility to detect the change of three dimensional shape of the ferromagnetic materials. On the other hand, FEM analysis of visualization measurement of the ferromagnetic material by this kind of magnetic lens did not obtain the tendency which is similar call by result experimental data. The further consideration of several conditions such as fluctuation of the external magnetic field sufficiently are needed to optimize of magnetic lens shape and visualize the magnetic materials. Using the results of this study, it is expected to develop the technology which visualizes the burying ferromagnetic materials like in the concrete.
Grant number：12555022 - PZT粒子分散自己診断複合材料の開発
1999 - 1999
Grant amount(Total)：2200000, Direct funding：2200000
Grant number：11750598 - 圧電特性を利用した自己診断材料の開発
1996 - 1996
Grant amount(Total)：1000000, Direct funding：1000000
Grant number：08750802