Performance information

• Energy Absorption Characteristics of Rigid Polymer Lattice Structure under Multiple Compressions　　　　　　　　　　　　　　　
  Tomohisa Kojima; Daiki Hotta; Tomoaki Tsuji
  Journal of the Japanese Society for Experimental Mechanics, Volume：25, Number：1, First page：in press, Jun. 2025, [Reviewed], [Lead, Corresponding], ［Domestic magazine］
  The Japanese Society for Experimental Mechanics, Japanese, Scientific journal
• Derivation of the basic structures of orthogonally symmetric lattice structures and finite element analysis of their compressive properties　　　　　　　　　　　　　　　
  Tomohisa Kojima; Yuta Takase; Tomoaki Tsuji
  Transactions of the JSME, Volume：89, Number：927, First page：23-00213, Nov. 2023, [Reviewed], [Lead, Corresponding], ［Domestic magazine］
  The Japan Society of Mechanical Engineers, Japanese, Scientific journal
  DOI：https://doi.org/10.1299/transjsme.23-00213
  DOI ID：10.1299/transjsme.23-00213
• Development of LaSAT and bonding strength evaluation of epoxy adhesive over a wide range of loading rates
  Aoi Takagi; Yoshikatsu Kimoto; Akihiro Shinozaki; Hiroyuki Yamada; Tomohisa Kojima; Akio Yonezu
  The Journal of Adhesion, Volume：100, Number：7, First page：576, Last page：598, Jul. 2023, [Reviewed], ［International magazine］
  Informa UK Limited, English, Scientific journal
  DOI：https://doi.org/10.1080/00218464.2023.2236028
  DOI ID：10.1080/00218464.2023.2236028, ISSN：0021-8464, eISSN：1545-5823
• Compressive Properties of Polymer Lattice Structures with Different Unit Cell Geometries at Low Strain Rates　　　　　　　　　　　　　　　
  Tomohisa Kojima; Takahiro Kawano; Tomoaki Tsuji
  Journal of the Japanese Society for Experimental Mechanics, Volume：23, Number：2, First page：138, Last page：144, Jun. 2023, [Reviewed], [Lead, Corresponding], ［Domestic magazine］
  The Japanese Society for Experimental Mechanics, Japanese, Scientific journal
  DOI：https://doi.org/10.11395/jjsem.23.138
  DOI ID：10.11395/jjsem.23.138
• Compressive behavior and energy absorption capacity of a lattice structure generated by topology optimization
  Tomohisa Kojima; Yuta Takase; Tomoaki Tsuji
  International Journal of Materials and Product Technology, Volume：66, Number：3/4, First page：252, Last page：265, Apr. 2023, [Reviewed], [Lead, Corresponding], ［International magazine］
  Inderscience Publishers, English, Scientific journal
  DOI：https://doi.org/10.1504/IJMPT.2022.10050727
  DOI ID：10.1504/IJMPT.2022.10050727, ISSN：0268-1900, eISSN：1741-5209
• Effect of shatterproof polymer film application on the fracture types and strength of glass subject to bending load　　　　　　　　　　　　　　　
  Tomohisa Kojima; Ryohei Momokawa; Takuma Matsuo; Mitsuo Notomi
  Engineering Failure Analysis, Volume：148, First page：107220, Last page：107220, Mar. 2023, [Reviewed], [Lead, Corresponding], ［International magazine］
  Elsevier BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.engfailanal.2023.107220
  DOI ID：10.1016/j.engfailanal.2023.107220, ISSN：1350-6307
• Dynamic Cavitation Inception by Wave Propagation Across Solid–Fluid Interface with Varying Solid Surface Wettability
  Tomohisa Kojima; Kazuaki Inaba
  Journal of Pressure Vessel Technology, Transactions of the ASME, Volume：145, Number：2, First page：021401 (10 pages), Jan. 2023, [Reviewed], [Lead, Corresponding], ［International magazine］
  Abstract
  
  Fluid–structure interaction (FSI) problems are important because they may induce serious damage to structures. In some FSI problems, the interaction mechanism is strongly dependent on the wave propagation across the solid–fluid interface. In this study, we attempted a quantitative evaluation of the effect of the solid surface wettability on the wave propagation across the solid–fluid interface with FSI in the case of longitudinal wave propagation vertically toward the interface. During the experiments, while the water was continuously compressed by the solid buffer motion, cavitation bubbles appeared being originated from the buffer–water interface as a result of the transmitted tensile wave propagating across the interface in a cycle. It was confirmed that interfacial boundary condition as wettability could change the wave transmission behavior owing to changes in the cavitation occurrence. It was also confirmed that the worse the wettability, the more severe the cavitation intensity, and the greater the difference between the energy lost by the buffer and the energy stored in the water. Consequently, the effect of the cavitation inception on the wave propagation at the solid–fluid interface with FSI could be quantitatively evaluated by considering the energy transferred from the solid to the water.
  The American Society of Mechanical Engineers, English, Scientific journal
  DOI：https://doi.org/10.1115/1.4056438
  DOI ID：10.1115/1.4056438, ISSN：0094-9930, eISSN：1528-8978, 共同研究・競争的資金等ID：12051615
• Prolonging rubber fatigue life using hysteresis of strain-induced crystallization of natural rubber　　　　　　　　　　　　　　　
  Manabu Okui; Akihiro Kojima; Itsuki Hisamichi; Shotaro Kuriyama; Tomohisa Kojima; Tomoaki Tsuji; Taro Nakamura
  Polymer Testing, Volume：117, First page：107800, Last page：107800, Jan. 2023, [Reviewed], ［International magazine］
  Elsevier BV, Japanese, Scientific journal
  DOI：https://doi.org/10.1016/j.polymertesting.2022.107800
  DOI ID：10.1016/j.polymertesting.2022.107800, ISSN：0142-9418
• Damping properties of pre-stressed shape-memory polymer sandwich beam
  Tomohisa Kojima; Daigo Sato; Mitsuo Notomi
  International Journal of Materials and Product Technology, Volume：64, Number：1, First page：78, Last page：92, Jan. 2022, [Reviewed], [Lead, Corresponding], ［International magazine］
  Inderscience Publishers, English, Scientific journal
  DOI：https://doi.org/10.1504/IJMPT.2022.10043898
  DOI ID：10.1504/IJMPT.2022.10043898, ISSN：0268-1900, ORCID：107945746, SCOPUS ID：85123181725
• Puncture Impact Test on Glass Plate Fitted with Shatterproof Window Film
  Tomohisa KOJIMA; Mitsuo NOTOMI; Tomoaki TSUJI
  Journal of the Society of Materials Science, Japan, Volume：70, Number：11, First page：796, Last page：801, Nov. 2021, [Reviewed], [Lead, Corresponding], ［Domestic magazine］
  The Society of Materials Science, Japan, Japanese, Scientific journal
  DOI：https://doi.org/10.2472/jsms.70.796
  DOI ID：10.2472/jsms.70.796, ISSN：0514-5163, ORCID：104830836, SCOPUS ID：85120380174
• Numerical Simulation on Dynamic Fracture of Glass Plate Fitted with Polymeric Film　　　　　　　　　　　　　　　
  Tomohisa Kojima; Masahiro Suzuki; Mitsuo Notomi
  Advanced Materials Research, Volume：1166, First page：57, Last page：64, Sep. 2021, [Reviewed], [Lead, Corresponding], ［International magazine］
  The impact resistance improvement is important for window glass to protect people from injury. Although it has been proved that the impact resistance of a glass plate can be improved easily by fitting a thin polymeric film, its mechanism has not been clarified yet. The purpose of this study is to clarify the reinforcing mechanism of the impact resistance of a glass plate by fitting a polymeric film. To clarify it, a numerical simulation model was built using ANSYS Autodyn to simulate the dynamic fracture of a glass plate fitted with a polymeric film. The simulation model and results were examined by comparing them to the experimental result in the previous study. The Johnson-Holmquist (JH2) damage model was used for the constitutive law of the glass plate. A polymeric film with 0.2 mm thickness (3% with the glass plate) was modeled at the non-impact surface of the glass plate. The nodes of the glass plate at the interface with the film connected the nodes of the film by perfect bonding. By comparing the simulation results to the experiment, it was indicated the importance of modeling the remaining fragments of the glass plate and the adhesive layer of the film in simulating the dynamic fracture of the glass plate fitted with polymeric film.
  Trans Tech Publications, English, Scientific journal
  DOI：https://doi.org/10.4028/www.scientific.net/AMR.1166.57
  DOI ID：10.4028/www.scientific.net/AMR.1166.57, ISSN：1662-8985, ORCID：100642067
• Internal Strain Measurement Method of Gel by Applying Particle Image Velocimetry and Digital Image Correlation　　　　　　　　　　　　　　　
  Tomohisa KOJIMA; Takumi NAKAMURA; Tomoaki TSUJI; Mitsuo NOTOMI; Hiroto Fujiya
  Journal of the Japanese Society for Experimental Mechanics, Volume：21, Number：1, First page：35, Last page：40, Mar. 2021, [Reviewed], [Lead, Corresponding], ［Domestic magazine］
  Japanese, Scientific journal
  DOI：https://doi.org/10.11395/jjsem.21.35
  DOI ID：10.11395/jjsem.21.35, ISSN：1346-4930, ORCID：94133136, 共同研究・競争的資金等ID：13912839
• Evaluation of dynamic fracture toughness of a bonded bi-material interface subject to high-strain-rate shearing using digital image correlation　　　　　　　　　　　　　　　
  Tomohisa Kojima; Yuta Kimura; Shuichi Arikawa; Mitsuo Notomi
  Engineering Fracture Mechanics, Volume：241, First page：107391, Last page：107391, Jan. 2021, [Reviewed], [Lead, Corresponding], ［International magazine］
  Elsevier BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.engfracmech.2020.107391
  DOI ID：10.1016/j.engfracmech.2020.107391, ISSN：0013-7944
• Formulation of stress concentration factor and shape optimization of gooseneck joint under uniaxial tensile load
  Takumi NAKAMURA; Yuko ARAI; Tomohisa KOJIMA; Tomoaki TSUJI
  Transactions of the JSME (in Japanese), Volume：86, Number：886, First page：19-00388, Jun. 2020, [Reviewed]
  Japan Society of Mechanical Engineers, Japanese, Scientific journal
  DOI：https://doi.org/10.1299/transjsme.19-00388
  DOI ID：10.1299/transjsme.19-00388, eISSN：2187-9761
• Numerical analysis of wave propagation across Solid–Fluid interface with Fluid–Structure interaction in circular tube
  Tomohisa Kojima; Kazuaki Inaba
  International Journal of Pressure Vessels and Piping, Volume：183, First page：104099, Apr. 2020, [Reviewed], [Lead, Corresponding], ［International magazine］
  English, Scientific journal
  DOI：https://doi.org/10.1016/j.ijpvp.2020.104099
  DOI ID：10.1016/j.ijpvp.2020.104099, ORCID：72882591, SCOPUS ID：85083296236, 共同研究・競争的資金等ID：12051615
• Fracture mode of glass plate subject to low-velocity impact: experimental investigation and finite element simulation　　　　　　　　　　　　　　　
  Tomohisa KOJIMA; Masahiro SUZUKI; Yuta TAJIRI; Kazuhiro UTAKAWA; Mitsuo NOTOMI
  Mechanical Engineering Journal－Bulletin of the JSME, Volume：6, Number：6, First page：19-00316 (14 pages), Dec. 2019, [Reviewed], [Lead, Corresponding]
  English, Scientific journal
  DOI：https://doi.org/10.1299/mej.19-00316
  DOI ID：10.1299/mej.19-00316, ISSN：2187-9745, ORCID：77299410
• Improving the Impact Resistance of Glass Plate by Sticking Thin Film
  Tomohisa Kojima; Kazuhiro Utakawa; Mitsuo Notomi
  Journal of the Japanese Society for Experimental Mechanics, Volume：18, Number：2, First page：103, Last page：109, Jun. 2018, [Reviewed], [Lead, Corresponding]
  Japanese, Scientific journal
  DOI：https://doi.org/10.11395/jjsem.18.103
  DOI ID：10.11395/jjsem.18.103, ISSN：1346-4930, ORCID：77299793
• Dynamics of Wave Propagation Across Solid-Fluid Movable Interface in Fluid-Structure Interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi; Farid Triawan; Kikuo Kishimoto
  Journal of Pressure Vessel Technology－Transactions of the ASME, Volume：139, Number：3, First page：031308 (9 pages), Jun. 2017, [Reviewed], [Lead]
  A theoretical model for wave propagation across solid-fluid interfaces with fluid-structure interaction (FSI) was explored by conducting experiments. Although many studies have been conducted on solid-solid and fluid-fluid interfaces, the mechanism of wave propagation across solid-fluid interfaces has not been well examined. Consequently, our aim is to clarify the mechanism of wave propagation across a solid-fluid interface with the movement of the interface and develop a theoretical model to explain this phenomenon. In the experiments conducted, a free-falling steel projectile was used to impact a solid buffer placed immediately above the surface of water within a polycarbonate (PC) tube. Two different buffers (aluminum and polycarbonate) were used to examine the relation between wave propagation across the interface of the buffer and water and the interface movement. With the experimental results, we confirmed that the peak value of the interface pressure can be predicted via acoustic theory based on the assumption that projectile and buffer behave as an elastic body with local deformation by wave propagation. On the other hand, it was revealed that the average profile of the interface pressure can be predicted with the momentum conservation between the projectile and the buffer assumed to be rigid and momentum increase of fluid. The momentum transmitted to the fluid gradually increases as the wave propagates and causes a gradual decrease in the interface pressure. The amount of momentum was estimated via the wave speed in the fluid-filled tube by taking into account the coupling of the fluid and the tube.
  ASME, English, Scientific journal
  DOI：https://doi.org/10.1115/1.4035376
  DOI ID：10.1115/1.4035376, ISSN：0094-9930, eISSN：1528-8978, Web of Science ID：WOS:000399914800016

• Development of LaSAT and Bonding Strength Evaluation of Epoxy Adhesive over a Wide Range of Loading Rates　　　　　　　　　　　　　　　
  Akio Yonezu; Yoshikatsu Kimoto; Akihiro Shinozaki; Shotaro Yasuda; Tomohisa Kojima; Hiroyuki Yamada
  Proceedings of JSME International Conference on Materials and Processing 2022, Volume：1, Number：Th‐1B‐2, First page：1, Last page：5, Nov. 2022, [Reviewed], [International magazine]
  The Japan Society of Mechanical Engineers, English, Summary international conference
• Dynamic Compressive Behavior of Polymeric Micro‐lattice Structure Fabricated by Optical 3D Printer　　　　　　　　　　　　　　　
  Ryoya Kuriyama; Takahiro Kawano; Tomohisa Kojima; Hiroyuki Yamada; Kohei Tateyama; Tomoaki Tsuji
  Proceedings of JSME International Conference on Materials and Processing 2022, Volume：1, Number：We‐2B‐2, First page：1, Last page：3, Nov. 2022, [Reviewed], [Corresponding], [International magazine]
  The Japan Society of Mechanical Engineers, English, Summary international conference
• Finite Element Analysis on Plastic Collapse Behavior of Topology-Optimized Cellular Structure Subject to Compressive Loading　　　　　　　　　　　　　　　
  Yuta Takase; Takahiro Kawano; Tomohisa Kojima; Tomoaki Tsuji
  Proceedings of the ASME 2021 International Mechanical Engineering Congress and Exposition, Volume：12, Nov. 2021, [Reviewed], [Corresponding], [International magazine]
  English, Summary international conference
  DOI：https://doi.org/10.1115/IMECE2021-70744
  DOI ID：10.1115/IMECE2021-70744
• Evaluation of Compressive and Energy Absorption Characteristic of a Closed-cell Polymeric Foam subject to Dynamic Loading
  Takahiro Kawano; Yuta Takase; Tomohisa Kojima; Hiroyuki Yamada; Kohei Tateyama; Tomoaki Tsuji
  EPJ Web of Conferences, Volume：250, First page：03004, Last page：03004, Sep. 2021, [Reviewed], [Corresponding], [International magazine]
  Foamed plastics have been used in many engineering fields because of their superiority in low density, energy absorption, thermal insulation, and acoustic damping capacities. With foams, it is known that the microstructure of cells directly relates to macroscopic deformation behaviour. However, mechanical properties based on microstructures composed of non-uniform cells have not been fully understood. This study aims to clarify the mechanical properties grounded on microstructures of foamed plastics subjected to dynamic loading. The quasi-static and dynamic compression test was carried out using foamed plastic with anisotropy in the cell structure, then the strain rate dependence of deformation and energy absorption characteristics was investigated. It was confirmed that the local buckling of the cells was the dominant deformation mode in the plastic collapse of the test piece. It was also confirmed that cell buckling was initiated around the middle in the height after the plastic collapse, then propagated to the whole specimen in both the quasi-static and dynamic tests by using digital image correlation. The stress-strain relationships and the amount of absorbed energy showed strain rate dependence owing to the deformation mode in which the local buckling of the cells is dominant.
  EDP Sciences, English
  DOI：https://doi.org/10.1051/epjconf/202125003004
  DOI ID：10.1051/epjconf/202125003004, eISSN：2100-014X
• Compressing behavior of a topology-optimized cellular structure　　　　　　　　　　　　　　　
  Tomohisa Kojima; Yuta Takase; Takahiro Kawano; Tomoaki Tsuji
  Proceedings of the 7th Asian Conference on Mechanics of Functional Materials and Structures, Mar. 2021, [Reviewed], [Lead, Corresponding], [International magazine]
  English
• The Stress Measurement System by using the Phosphorescence Light Intensity from Elasticoluminescent Materials　　　　　　　　　　　　　　　
  Tomoaki Tsuji; Tomohisa Kojima
  Proceedings of the 7th Asian Conference on Mechanics of Functional Materials and Structures, Mar. 2021, [Reviewed], [Last], [International magazine]
  English
• Observation of Dynamic Deformation and Fracture Behavior of Bonded Material by Digital Image Correlation and Evaluation of Dynamic Fracture Toughness　　　　　　　　　　　　　　　
  Yuta Kimura; Tomohisa Kojima; Shuichi Arikawa; Mitsuo Notomi
  Proceedings of the 15th international Symposium on Mechanics, Aerospace and Informatics Engineering 2021, Volume：1, Jan. 2021, [Reviewed], [Invited], [International magazine]
  English
• Puncture Impact Behavior of Glass Plate Fitted With a Polymeric Film
  Tomohisa Kojima
  Proceedings of the ASME 2020 International Mechanical Engineering Congress and Exposition, Volume：12, Number：IMECE2020-23662, First page：1, Last page：6, Nov. 2020, [Reviewed], [Lead, Last, Corresponding], [International magazine]
  
  Glass plates are used extensively as windows in structures, cars, and airplanes. However, because it is a brittle material with low practical strength, improving its resistance to puncture impact loading is important for safety and security. Although it is known that fitting a polymeric film to the glass plate is an easy and effective way to reinforce it against impact loads, the effect of the film fitting has not enough been evaluated quantitatively. In this study, puncture impact behavior was investigated with a glass plate fitted with a polymeric film. When the general puncture impact testing method is applied to a glass plate, the measured load profile would be intensely oscillated by resonance. Therefore, in this study, the modified testing method utilizing the steel incident bar was adopted. By dropping the steel weight, impact loads were applied to the glass plate with the film through the steel incident bar. The applied impact load was estimated from the strain gauge outputs at the incident bar. The stress distribution and crack propagation in the thickness direction of the specimen were observed using the photoelastic method and shadowgraph method with the high-speed video camera. The numerical analysis model capable of reproducing the experiment was built. The obtained load-displacement curves did not include vibrations because of resonance. By the method used in this study, it is possible to quantitatively evaluate the effect of film-fitting on the glass plate.
  American Society of Mechanical Engineers, English
  DOI：https://doi.org/10.1115/imece2020-23662
  DOI ID：10.1115/imece2020-23662
• Examination of optimum conditions of stretching, polarization and annealing when producing piezoelectric PVDF film　　　　　　　　　　　　　　　
  M. Yamaguchi; T. Baba; T. Kojima; T. Tsuji
  Proceedings of the 10th TSME International Conference on Mechanical Engineering, Volume：1, Number：1, First page：140, Last page：144, Dec. 2019, [Reviewed]
  English
• FEM Analysis of 3D Printable Pleated Pneumatic Artificial muscle　　　　　　　　　　　　　　　
  S. Kuriyama; I. Hisamichi; F. Ito; A. Kojima; M. Okui; T. Kojima; T. Nakamura; T. Tsuji
  Proceedings of the 10th TSME International Conference on Mechanical Engineering, Volume：1, Number：1, First page：149, Last page：155, Dec. 2019, [Reviewed]
  English
• The Relationship between the Stress and the Fluorescence Lifetime of Fluorescence Material　　　　　　　　　　　　　　　
  K. Nogawa; T. Kojima; H. Toda; K. Yoshino; T. Tsuji
  Proceedings of the 10th TSME International Conference on Mechanical Engineering, Volume：1, Number：1, First page：145, Last page：148, Dec. 2019, [Reviewed]
  English
• Fracture Mode of Glass Plate Laminated with Polymeric Film　　　　　　　　　　　　　　　
  Ryohei Momokawa; Tomohisa Kojima; Mitsuo Notomi
  Proceedings of the 14th International symposium on Mechanics, Aerospace and Informatics Engineering 2019, Volume：1, First page：21, Last page：23, Sep. 2019, [Reviewed], [Corresponding], [International magazine]
  English
• Numerical simulation on the Impact Fracture of Glass Plate Stuck with Polymeric Film　　　　　　　　　　　　　　　
  Tomohisa KOJIMA; Masahiro SUZUKI; Mitsuo NOTOMI
  Proceedings of the 10th International Symposium on Impact Engineering 2019 (ISIE2019), Volume：1, Number：1, First page：pp.181, Last page：187, Jul. 2019, [Reviewed], [Lead, Corresponding]
  English
• A Study for Theoretical Modeling of Cavitation Inducement From the Solid-Fluid Interface With Fluid-Structure Interaction
  Tomohisa Kojima; Kazuaki Inaba; Yuto Takada
  Proceedings of the ASME 2018 Pressure Vessels and Piping Conference (PVP2018), Volume：4, Number：PVP2018-84811, First page：1, Last page：10, Jul. 2018, [Reviewed], [Lead, Corresponding]
  English
  DOI：https://doi.org/10.1115/PVP2018-84811
  DOI ID：10.1115/PVP2018-84811
• Effect of Solid Surface Wettability on the Formation of Cavitating Wave Front with Fluid-Structure Interaction
  Tomohisa Kojima; Kazuaki Inaba; Yuto Takada; Farid Triawan
  Proceedings of the 10th International Symposium on Cavitation (CAV2018), First page：336, Last page：339, May 2018, [Reviewed], [Lead, Corresponding]
  English
  DOI：https://doi.org/10.1115/1.861851_ch65
  DOI ID：10.1115/1.861851_ch65
• WAVE PROPAGATION ACROSS THE INTERFACE OF FLUID-STRUCTURE INTERACTION WITH VARIOUS SURFACE CONDITIONS OF SOLID MEDIUM　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi
  PROCEEDINGS OF THE ASME 2016 PRESSURE VESSELS AND PIPING CONFERENCE, Volume：4, Number：PVP2016-63746, First page：1, Last page：10, 2017, [Reviewed], [Lead]
  This study aims to clarity the effect of surface conditions of solid on wave propagation at solid-fluid interface with fluid structure interaction. Although many studies have been done to develop the theoretical models of fluid-structure interaction caused by wave propagation, they do not take into account the surface conditions of the solid medium on the solid-fluid interface where interaction occurs. In this study, we experimentally investigated the wave propagation across the solid-fluid interface with several value of surface wettabilities and roughnesses of solid. We conducted an impact experiment with a free-falling projectile which hit the cylindrical solid buffer placed on top of the water surface within the elastic tube standing on the ground. During the experiments, cavitation bubbles were generated from the interface of the buffer and water That generation was inhibited according to the decrease of the value of the contact angle (improve of the wettability) of the buffer surface. The amplitude of transmitted pressure wave from the buffer to water become smaller than the theoretical value according to the decrease of the value of the contact angle on the buffer surface (the smallest value was 55% of the theoretical value). Concerning the surface roughness, the amplitude of transmitted pressure wave becomes smaller than the theoretical value according to the shape of the buffer surface become more different from flat surface (the smallest value was 75% of the theoretical value). These experimental results indicate that by taking into account the surface condition of the solid on the interface, more accurate model of fluid-structure interaction or ways to reduce the damage of structures by fluid-structure interaction would be proposed.
  AMER SOC MECHANICAL ENGINEERS, English
  DOI：https://doi.org/10.1115/PVP2016-63746
  DOI ID：10.1115/PVP2016-63746, Web of Science ID：WOS:000397071300003
• Numerical study on wave propagation across solid-fluid interface with fluid-structure interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Farid Triawan; Kikuo Kishimoto
  Proceedings of Japan-Taiwan Workshop on Mechanical and Aerospace Engineering 2016, Volume：I2, First page：pp.1, Last page：6, Nov. 2016, [Reviewed], [Lead]
  English
• WAVE PROPAGATION ACROSS SOLID-FLUID INTERFACE WITH FLUID-STRUCTURE INTERACTION　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi
  PROCEEDINGS OF THE ASME 2015 PRESSURE VESSELS AND PIPING CONFERENCE, Volume：5, Number：PVP2015-45752, First page：1, Last page：10, 2015, [Reviewed], [Lead]
  This paper reports on investigations conducted with a view towards developing a theoretical model for wave propagation across solid-fluid interfaces with fluid-structure interaction. Although many studies have been conducted, the mechanism of wave propagation close to the solid-fluid interface remains unclear Consequently, our aim is to clarify the mechanism of wave propagation across the solid-fluid interface with fluid structure interaction and develop a theoretical model to explain this phenomenon. In experiments conducted to develop the theory, a free-falling steel projectile is used to impact the top of a solid buffer placed immediately above the surface of water within a polycarbonate tube. The stress waves created as a result of the impact.of the projectile propagated through the buffer and reached the interface of the buffer and water (fluid) in the tube. Two different buffers (polycarbonate and aluminum) were used to examine the interaction effects. The results of the experiments indicated that the amplitude of the interface pressure increased in accordance with the characteristic impedance of the solid medium. This cannot be explained by the classical theory of wave reflection and transmission. Thus, it is clear that on the solid-fluid interface with fluid-structure interaction, classical theories alone cannot precisely predict the generated pressure.
  AMER SOC MECHANICAL ENGINEERS, English
  DOI：https://doi.org/10.1115/PVP2015-45752
  DOI ID：10.1115/PVP2015-45752, ORCID put code：25837929, Web of Science ID：WOS:000375807800016

• Strain rate dependence of the compressive strength of polymer lattice structures with typical unit cell topologies　　　　　　　　　　　　　　　
  Tomohisa Kojima; Takahiro Kawano; Hidaka Ishii; Kohei Tateyama; Hiroyuki Yamada; Kensuke Kaheyama; Tomoaki Tsuji
  The 14th Asia-Pacific Conference on Fracture and Strength, Nov. 2024, The Japan Society of Mechanical Engineers, [International conference]
  Nov. 2024 - Nov. 2024, English, Oral presentation, Matsue, Shimane, Japan
• Making Research Paper Evaluation of Compressive Characteristics of Microlattice Structures Using Dynamic Explicit FEM　　　　　　　　　　　　　　　
  Kota Yasue; Tomoaki Tsuji; Tomohisa Kojima
  JSME 31th Materials and Processing Conference, Nov. 2024, The Japan Society of Mechanical Engineers, [Domestic conference]
  Nov. 2024 - Nov. 2024, Japanese, Oral presentation, Toyama, Toyama, Japan
• Evaluation of Strain Rate Dependent Compressive Properties of Mechanical Metamaterials with Multistable Structures　　　　　　　　　　　　　　　
  Rin Nagai; Tomoaki Tsuji; Hiroyuki Yamada; Tomohisa Kojima
  JSME 31th Materials and Processing Conference, Nov. 2024, The Japan Society of Mechanical Engineers, [Domestic conference]
  Nov. 2024 - Nov. 2024, Japanese, Oral presentation, Toyama, Toyama, Japan
• Evaluation of tensile properties of Kagome lattice structures　　　　　　　　　　　　　　　
  Kim Jaehyeok; Kensuke Kageyama; Tomohisa Kojima
  JSMS Kanto Branch 2024 Student Research Exchange Presentation, Oct. 2024, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2024 - Oct. 2024, Japanese, Poster presentation, Meguro-ku, Tokyo, Japan
• Evaluation of mechanical properties of Kirigami-induced 3D honeycomb structure　　　　　　　　　　　　　　　
  Ryo Togashi; Kensuke Kageyama; Tomohisa Kojima
  JSMS Kanto Branch 2024 Student Research Exchange Presentation, Oct. 2024, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2024 - Oct. 2024, Japanese, Poster presentation, Meguro-ku, Tokyo, Japan
• Tensile analysis of Kagome lattice structure using finite element method　　　　　　　　　　　　　　　
  Sotaro Masuda; Kensuke Kageyama; Tomohisa Kojima
  JSMS Kanto Branch 2024 Student Research Exchange Presentation, Oct. 2024, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2024 - Oct. 2024, Japanese, Poster presentation, Meguro-ku, Tokyo, Japan
• Investigation of stress wave propagation characteristics in fractal structure　　　　　　　　　　　　　　　
  Yuma Kawamoto; Kensuke Kageyama; Tomohisa Kojima
  JSMS Kanto Branch 2024 Student Research Exchange Presentation, Oct. 2024, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2024 - Oct. 2024, Japanese, Poster presentation, Meguro-ku, Tokyo, Japan
• Finite element analysis of the dynamic collapse behavior of brittle micro-lattice structure　　　　　　　　　　　　　　　
  Kota Yasue; Kohei Tateyama; Hiroyuki Yamada; Tomoaki Tsuji; Tomohisa Kojima
  JSMS Kanto Branch Lecture on Material Strength Research for Battery Development, Oct. 2024, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2024 - Oct. 2024, Japanese, Poster presentation, Bunkyo-ku, Tokyo, Japan
• Strain Rate Dependence of Tensile Properties of the Polymers Fabricated by Additive Manufacturing with Optical Method　　　　　　　　　　　　　　　
  Tomohisa Kojima; Ryoya Kuriyama; Hidaka Ishii; Hiroyuki Yamada; Kensuke Kageyama; Tomoaki Tsuji
  The 14th Symposium on Impact Problems of Materials, Oct. 2024, The Society of Materials Science, Japan, [Domestic conference]
  Oct. 2024 - Oct. 2024, Japanese, Oral presentation, Kyoto, Kyoto, Japan
• Modeling of strain rate-dependent compression properties of rigid polymer foam in relation to foaming properties　　　　　　　　　　　　　　　
  Tomohisa Kojima; Takahiro Kawano; Yuta Takase; Kohei Tateyama; Hiroyuki Yamada; Kensuke Kageyama; Tomoaki Tsuji
  The 4th International Workshops on Advances in Computational Mechanics (IWACOM-IV), Sep. 2024, The Japan Society for Computational Engineering and Science, [Invited], [International conference]
  Sep. 2024 - Sep. 2024, English, Invited oral presentation, Kitakyushu, Fukuoka, Japan
• Mechanical Characterization of Polymeric Lattice Structure Subject to Dynamic Loading　　　　　　　　　　　　　　　
  Tomohisa Kojima; Ryoya Kuriyama; Takahiro Kawano; Hiroyuki Yamada; Kohei Tateyama; Tomoaki Tsuji
  11th International Symposium on Impact Engineering (ISIE2023), Dec. 2023, [Invited], [International conference]
  Dec. 2023 - Dec. 2023, English, Invited oral presentation, Perth, Austria
• Numerical analysis of the response of a multistable mechanical metamaterial to dynamic loading　　　　　　　　　　　　　　　
  Rin Nagai; Tomoaki Tsuji; Tomohisa Kojima
  11th International Symposium on Impact Engineering (ISIE2023), Dec. 2023, [International conference]
  Dec. 2023 - Dec. 2023, English, Oral presentation, Perth, Australia
• Determination of Wood Modulus as Orthotropic by Antisymmetric Indentation by using Cylindrical Indenter　　　　　　　　　　　　　　　
  Tomoaki Tsuji; Tomohisa Kojima; Kohei Saito
  7th Joint-Symposium on Mechanics of Advanced Materials & Structures, Dec. 2023, [Invited], [International conference]
  Dec. 2023 - Dec. 2023, English, Invited oral presentation, Chengdu, China
• Numerical analysis of dynamic compression of micro-lattice structure using explicit method　　　　　　　　　　　　　　　
  Kota Yasue; Tomoaki Tsuji; Tomohisa Kojima
  JSMS Kanto Branch 2023 Student Research Exchange Presentation, Oct. 2023, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2023 - Oct. 2023, Japanese, Poster presentation, Bunkyo-ku, Tokyo, Japan
• Strain rate-dependent Mechanical Properties of Additively Manufactured Polymer Structures Fabricated by Optical Fabrication Method　　　　　　　　　　　　　　　
  Ryoya Kuriyama; Takahiro Kawano; Kohei Tateyama; Hiroyuki Yamada; Tomoaki Tsuji; Tomohisa Kojima
  第9回材料WEEK 材料シンポジウム「若手学生研究発表会（学生・企業研究交流会）」, Oct. 2023, The Society of Materials Science, Japan, [Domestic conference]
  Oct. 2023 - Oct. 2023, Japanese, Poster presentation, Kyoto, Kyoto, Japan
• Fatigue Life Measurement of Strain-Induced Crystallized Rubber Materials　　　　　　　　　　　　　　　
  Takumi Aso; Sota Shiokawa; Tomohisa Kojima; Tomoaki Tsuji
  JSME M&M2023 Materials and Mechanics Conference, Sep. 2023, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2023 - Sep. 2023, Japanese, Oral presentation, Tsukuba, Ibaraki, Japan
• Evaluation of compressive properties of micro-lattice structures with orthotropic symmetry by finite element analysis　　　　　　　　　　　　　　　
  Tomohisa Kojima; Yuta Takase; Tomoaki Tsuji
  JSME M&M2023 Materials and Mechanics Conference, Sep. 2023, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2023 - Sep. 2023, Japanese, Oral presentation, Tsukuba, Ibaraki, Japan
• Evaluation of strain rate dependent compressive behavior of additively manufactured polymeric lattice structure　　　　　　　　　　　　　　　
  Tomohisa Kojima; Ryoya Kuriyama; Takahiro Kawano; Hiroyuki Yamada; Kohei Tateyama; Tomoaki Tsuji
  2023 M&M/CMD Symposium for Young Researchers, Aug. 2023, The Japan Society of Mechanical Engineers, [Domestic conference]
  Aug. 2023 - Aug. 2023, Oral presentation, Kanazawa, Ishikawa, Japan
• Evaluation of Strain Rate Dependent Compressive Properties of Rigid Polymer Foam　　　　　　　　　　　　　　　
  Tomohisa Kojima; Takahiro Kawano; Yuta Takase; Hiroyuki Yamada; Kohei Tateyama; Tomoaki Tsuji
  令和4年度第3回 応力・ひずみ測定部門講演会, Mar. 2023, 応力・ひずみ測定部門, The Japanese Society for Non-Destructive Inspection, [Domestic conference]
  Mar. 2023 - Mar. 2023, Japanese, Oral presentation, Chita, Aichi, Japan
• Starting research in the field of impact engineering (from fluid-structure interaction to metamaterials)　　　　　　　　　　　　　　　
  Tomohisa Kojima
  JSMS Committee on IMPACT 168th Committee Meeting and Lecture, Mar. 2023, JSMS Committee on IMPACT, [Invited], [Domestic conference]
  Mar. 2023 - Mar. 2023, Japanese, Public discourse, Kyoto, Kyoto, Japan
• Investigation of wave propagation phenomena across the solid-fluid interface and trial of underwater pressure wave attenuation by lattice metamaterials　　　　　　　　　　　　　　　
  Tomohisa Kojima
  The 13th meeting of the Research Group on Integration of Different Fields in Mechanics of Materials, Mar. 2023, Materials & Mechanics Division, The Japan Society of Mechanical Engineers, [Invited], [Domestic conference]
  Mar. 2023 - Mar. 2023, Japanese, Public discourse, Bunkyo-ku, Tokyo, Japan
• Finite Element Analysis of Stress Wave Propagation in Micro-lattice Structures Subjected to Dynamic Loading　　　　　　　　　　　　　　　
  Yugo Sakiyama; Tomohisa Kojima; Tomoaki Tsuji
  JSME 35th Computational Mechanics Division Conference, Nov. 2022, The Japan Society of Mechanical Engineers, [Domestic conference]
  Nov. 2022 - Nov. 2022, Japanese, Oral presentation, Online, Japan
• Investigation of lattice structure with superior shear resistance by using topology optimization　　　　　　　　　　　　　　　
  Rin Nagai; Yuta Takase; Tomohisa Kojima; Tomoaki Tsuji
  JSMS Kanto Branch 2022 Student Research Exchange Presentation, Oct. 2022, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2022 - Oct. 2022, Japanese, Poster presentation, Yokohama, Kanagawa, Japan
• Life prediction by tensile fatigue test of rubber under constant load　　　　　　　　　　　　　　　
  Takumi Aso; Sota Shiokawa; Tomohisa Kojima; Tomoaki Tsuji
  JSMS Kanto Branch 2022 Student Research Exchange Presentation, Oct. 2022, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Oct. 2022 - Oct. 2022, Japanese, Poster presentation, Yokohama, Kanagawa, Japan
• Evaluation of Dynamic Compressive Behavior of a Closed-cell Rigid Polymer Foam　　　　　　　　　　　　　　　
  Tomohisa KOJIMA; Yuta TAKASE; Takahiro KAWANO; Hiroyuki YAMADA; Kohei TATEYAMA; Tomoaki TSUJI
  JSME M&M2022 Materials and Mechanics Conference, Sep. 2022, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2022 - Sep. 2022, Japanese, Oral presentation, Hirosaki, Aomori, Japan
• Stress Concentration Factor and Tensile Strength of Gooseneck Joint under Uniaxial Tensile Load　　　　　　　　　　　　　　　
  Takumi NAKAMURA; Hajime OZAWA; Tomohisa KOJIMA; Tomoaki TSUJI
  JSME M&M2022 Materials and Mechanics Conference, Sep. 2022, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2022 - Sep. 2022, Japanese, Oral presentation, Hirosaki, Aomori, Japan
• マイクロラティス構造の音響特性評価　　　　　　　　　　　　　　　
  Yugo Sakiyama; Yuta Takase; Tomohisa Kojima; Tomoaki Tsuji
  JSMS Kanto Branch 2021 Student Research Exchange Presentation, Dec. 2021, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Dec. 2021 - Dec. 2021, Japanese, Oral presentation, Online, Japan
  共同研究・競争的資金等ID：32467580
• Evaluation of dynamic fracture toughness of a metal/polymer bonding interface subject to high-strain-rate shearing using digital image correlation　　　　　　　　　　　　　　　
  Tomohisa Kojima; Yuta Kimura; Shuichi Arikawa; Mitsuo Notomi
  1st Virtual ESIS TC4 Conference on Fracture of Polymers, Composites and Adhesives, Sep. 2021, Elsevier, and the European Structural Integrity Society - Technical Committee 4, [International conference]
  Sep. 2021 - Sep. 2021, English, Poster presentation, Online
• Finite element analysis of compression and plastic collapse behavior of cellular structure designed by topology optimization　　　　　　　　　　　　　　　
  Yuta Takase; Takahiro Kawano; Tomohisa Kojima; Tomoaki Tsuji
  JSME 34th Computational Mechanics Division Conference, Sep. 2021, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2021 - Sep. 2021, Japanese, Oral presentation, Online, Japan
• Visualization of push-cutting deformation by sharp blades using particle image velocimetry and digital image correlation　　　　　　　　　　　　　　　
  Hiroyuki Yamada; Asuki Ejiri; Nagahisa Ogasawara; Tomohisa Kojima
  JSME M&M2021 Materials and Mechanics Conference, Sep. 2021, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2021 - Sep. 2021, Japanese, Oral presentation, Online, Japan
• Internal strain measurement of gel by digital image correlation using particle images　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kaho Kotani; Tomoaki Tsuji
  JSME M&M2021 Materials and Mechanics Conference, Sep. 2021, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2021 - Sep. 2021, Japanese, Oral presentation, Online, Japan
• Relationship Between Initial Strain Load and Fatigue Life of the Rubber with Strain-induced Crystallization　　　　　　　　　　　　　　　
  Sota Shiokawa; Shotaro Kuriyama; Tomoaki Tsuji; Tomohisa Kojima; Akihiro Kojima
  JSME M&M2021 Materials and Mechanics Conference, Sep. 2021, The Japan Society of Mechanical Engineers, [Domestic conference]
  Sep. 2021 - Sep. 2021, Japanese, Oral presentation, Online, Japan
• Evaluation of Compressive and Energy Absorption Characteristic of a Closed-cell Polymeric Foam subject to Dynamic Loading　　　　　　　　　　　　　　　
  Takahiro KAWANO; Yuta TAKASE; Tomohisa KOJIMA; Hiroyuki YAMADA; Kohei TATEYAMA; Tomoaki TSUJI
  日本材料学会第70期学術講演会, May 2021, The Society of Materials Science, Japan, [Domestic conference]
  May 2021 - May 2021, Japanese, Oral presentation, Online, Japan
• Observation of Dynamic Deformation and Fracture Behavior of Bonded Material by Digital Image Correlation and Evaluation of Dynamic Fracture Toughness　　　　　　　　　　　　　　　
  Yuta Kimura; Tomohisa Kojima; Shuichi Arikawa; Mitsuo Notomi
  The 15th international Symposium on Mechanics, Aerospace and Informatics Engineering 2021, Jan. 2021, Gyeongsang National University, Korea and School of Science and Technology, Meiji University, Japan, [Invited], [International conference]
  Jan. 2021 - Jan. 2021, English, Keynote oral presentation, Online
• 3次元セル構造体のエネルギ吸収特性評価　　　　　　　　　　　　　　　
  Takahiro Kawano; Tomohisa Kojima; Tomoaki Tsuji
  JSMS Kanto Branch 2020 Student Research Exchange Presentation, Dec. 2020, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Dec. 2020 - Dec. 2020, Japanese, Oral presentation, Online, Japan
• ゴムの引張疲労試験による寿命予測式の算出　　　　　　　　　　　　　　　
  Sota Shiokawa; Shotaro Kuriyama; Tomoaki Tsuji; Tomohisa Kojima
  JSMS Kanto Branch 2020 Student Research Exchange Presentation, Dec. 2020, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Dec. 2020 - Dec. 2020, Japanese, Oral presentation, Online, Japan
• トポロジー最適化を用いたエネルギー吸収材としてのセル構造体の設計　　　　　　　　　　　　　　　
  Yuta Takase; Tomohisa Kojima; Tomoaki Tsuji
  JSMS Kanto Branch 2020Student Research Exchange Presentation, Dec. 2020, The Society of Materials Science, Japan, Kanto Branch, [Domestic conference]
  Dec. 2020 - Dec. 2020, Japanese, Oral presentation, Online, Japan
• Evaluation by Numerical Simulation on the Impact Energy Absorption Mechanism of Glass Plate Stuck with Anti-scattering Film　　　　　　　　　　　　　　　
  Masahiro SUZUKI; Tomohisa KOJIMA; Mitsuo NOTOMI
  材料力学における異分野融合に関する研究会 第11回研究会（ミニシンポジウム ）, Dec. 2020, 材料力学における異分野融合に関する研究会, Materials and Mechanics Division, The Japan Society of Mechanical Engineers, [Domestic conference]
  Dec. 2020 - Dec. 2020, Japanese, Oral presentation, Online
• Puncture Impact Testing of Glass Plate Fitted with Shatterproof Film　　　　　　　　　　　　　　　
  Tomohisa Kojima; Mitsuo Notomi; Tomoaki Tsuji
  The 16th Asia-Pacific Conference on Fracture and Strength (APCFS2020), Nov. 2020, Division of Materials and Fracture, The Korean Society of Mechanical Engineers, [International conference]
  Nov. 2020 - Nov. 2020, English, Oral presentation, Jeju, Korea and online, Korea, Republic of
• Puncture Impact Test on Glass Plate Fitted with Shatterproof Film　　　　　　　　　　　　　　　
  Tomohisa Kojima; Mitsuo Notomi; Tomoaki Tsuji
  The 13th Symposium for Impact Behavior of Materials, Oct. 2020, The Society of Materials Science, Japan, [Domestic conference]
  Oct. 2020 - Oct. 2020, Japanese, Oral presentation, Online, Japan
• Thermal stress measurement using image correlation method　　　　　　　　　　　　　　　
  Hajime Ozawa; Takumi Nakamura; Tomohisa Kojima; Tomoaki Tsuji
  日本材料学会第 69 期学術講演会, May 2020, The Society of Materials Science, Japan, [Domestic conference]
  May 2020 - May 2020, Japanese, Oral presentation, Japan
• Stress measurement by using the fluorescence　　　　　　　　　　　　　　　
  Noriyuki KOGO; Tomoaki TSUJI; Tomohisa KOJIMA
  The 51st Symposium on Stress-strain Measurement and Strength Evaluation, Jan. 2020, Technical Committee on Stress and Strain Measurement, The Japanese Society for Non-Destructive Inspection, [Domestic conference]
  Japanese, Oral presentation, Tokyo, Japan
• Internal Strain Measurement of Gel by Digital Image Correlation　　　　　　　　　　　　　　　
  Tomohisa KOJIMA; Masaki FUKAWA; Mitsuo NOTOMI; Hiroto FUJIYA
  The 51st Symposium on Stress-strain Measurement and Strength Evaluation, Jan. 2020, Technical Committee on Stress and Strain Measurement, The Japanese Society for Non-Destructive Inspection, [Domestic conference]
  Japanese, Oral presentation, Tokyo, Japan
• Effect of dynamic cavitation inception on wave propagation across the solid-fluid interface with fluid-structure interaction　　　　　　　　　　　　　　　
  Kazuaki Inaba; Tomohisa Kojima
  JSME M&M2019 Materials and Mechanics Conference, Nov. 2019, The Japan Society of Mechanical Engineers, [Domestic conference]
  Japanese, Oral presentation, Fukuoka, Japan
• Phosphorescence light decay curve from mechanoluminescence material subjected to hydrostatic load　　　　　　　　　　　　　　　
  Tomoaki Tsuji; Tomohisa Kojima
  JSME M&M2019 Materials and Mechanics Conference, Nov. 2019, The Japan Society of Mechanical Engineers, [Domestic conference]
  Japanese, Oral presentation, Fukuoka, Japan
• Numerical Simulation on the Impact Fracture of Glass Plate Stuck with Window Polyester Film　　　　　　　　　　　　　　　
  Masahiro SUZUKI; Tomohisa KOJIMA; Mitsuo NOTOMI
  JSME M&M2019 Materials and Mechanics Conference, Nov. 2019, The Japan Society of Mechanical Engineers, [Domestic conference]
  Japanese, Oral presentation, Fukuoka, Japan
• 窓用飛散防止フィルムを貼付したフロートガラスの破壊モード特性　　　　　　　　　　　　　　　
  Ryohei Momokawa; Tomohisa Kojima; Mitsuo Notomi
  JSMS Kanto Branch 2019 Student Research Exchange Presentation, Sep. 2019, The Society of Materials Science, Japan, [Domestic conference]
  Japanese, Poster presentation, Hiyoshi, Japan
• Numerical Simulation Model for Impact Fracture of a Glass Plate Subject to Low-Velocity Impact　　　　　　　　　　　　　　　
  Tomohisa KOJIMA; Masahiro SUZUKI; Yuta TAJIRI; Mitsuo NOTOMI
  JSME 32nd Computational Mechanics Division Conference (CMD2019), Sep. 2019, The Japan Society of Mechanical Engineers, [Domestic conference]
  Japanese, Oral presentation, Kawagoe, Japan
• Observation of Dynamic Deformation and Fracture Behavior of Bonded Material by Digital Image Correlation and Investigation of Fracture Toughness　　　　　　　　　　　　　　　
  Shuichi Arikawa; Yuta Kimura; Tomohisa Kojima
  8th International Conference MECHANICS AND MATERIALS IN DESIGN (M2D 2019), Sep. 2019, [International conference]
  English, Oral presentation, University of Bologna, Italy
• Evaluation of the cavitation formation at the solid-fluid interface in fluid-structure interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba
  JSME M&M Symposium 2019 for Young Researchers, Aug. 2019, Materials & Mechanics Division, The Japan Society of Mechanical Engineers, [Domestic conference]
  Japanese, Oral presentation, Izunokuni, Japan
• The Mechanical Relationship between Concussion and American Football Helmet　　　　　　　　　　　　　　　
  Tomohisa Kojima; Mitsuo Notomi; Hiroto Hujiya
  The 29th Annual Meeting of the Japanese Society of Clinical Sports Medicine, Nov. 2018, The Japanese Society of Clinical Sports Medicine, [Domestic conference]
  Japanese, Poster presentation, Sapporo, Japan, Japan
• Design of auxetic structure and evaluation of shock absorption　　　　　　　　　　　　　　　
  Akihisa Takahashi; Toshitake Tateno; Tomohisa Kojima
  Japan Society for Design Engineering 2018 autumn annual conferences, Sep. 2018, Japan Society for Design Engineering (JSDE), [Domestic conference]
  Japanese, Oral presentation, Tottori, Japan
• Effect of Fiber Orientation on Mechanical Property of CFRP fabricated by AM　　　　　　　　　　　　　　　
  T. Tanaka; T. Tateno; T. Kojima
  41st Solid Mechanics Conference (SOLMECH 2018), Aug. 2018, Institute of Fundamental Technological Research, Polish Academy of Sciences, [International conference]
  English, Oral presentation, Warsaw, Poland
• Corrosion Behaviors of Magnesium Film Coated with Biocompatible Materials Under Pseudo-Biological Environment　　　　　　　　　　　　　　　
  S. Manzaki; T. Kojima; M. Notomi
  41st Solid Mechanics Conference (SOLMECH 2018), Aug. 2018, Institute of Fundamental Technological Research, Polish Academy of Sciences, [International conference]
  English, Oral presentation, Warsaw, Poland
• The Fracture Mode of a Glass Plate Stuck with Thin Film Under a Low-Velocity Impact　　　　　　　　　　　　　　　
  T. Kojima; K. Utakawa; M. Notomi
  41st Solid Mechanics Conference (SOLMECH 2018), Aug. 2018, Institute of Fundamental Technological Research, Polish Academy of Sciences, [International conference]
  English, Oral presentation, Warsaw, Poland
• Two-dimensional Axisymmetric Simulation of Wave Propagation Across Solid-fluid Interface with Fluid-structure Interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Farid Triawan; Kazuaki Inaba; Kikuo Kishimoto
  M&M2017 MATERIALS AND MECHANICS CONFERENCE, Oct. 2017, The Japan Society of Mechanical Engineers, [Domestic conference]
  Japanese, Oral presentation, Sapporo, Japan
• Mechanics of Fluid-Structure Interaction associated with Wave Propagation across Solid-Fluid Interface　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi; Kikuo Kishimoto
  2015 Joint-Symposium on Mechanics of Advanced Materials & Structures (JSMAMS 2015), Nov. 2015, [International conference]
  English, Public symposium, Tokyo, Japan
• Effect of Surface Condition of Solid Materials on Wave propagation at Solid-Fluid Interface with Fluid-Structure Interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi; Kikuo Kishimoto
  M&M2015 MATERIALS AND MECHANICS CONFERENCE, Nov. 2015, The Japan Society of Mechanical Engineers, [Domestic conference]
  Japanese, Oral presentation, Tokyo, Japan
• Effect of wave propagation across solid-fluid interface on fluid-structure interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi; Kikuo Kishimoto
  2015 Beihang Univ.-Tokyo Tech Joint Workshop on Nano/Micro-Engineering, Oct. 2015, [International conference]
  English, Public symposium, Beijing, China
• Wave Propagation across Solid-Fluid Interface with Fluid-Structure Interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi; Kikuo Kishimoto
  UK-Japan Symposium on Materials Under Extreme Conditions: Effects of Temperature, High Strain Rate and Irradiation, Sep. 2015, [International conference]
  English, Oral presentation
• Wave Propagation across Solid-Fluid Interface with Fluid-Structure Interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi; Kikuo Kishimoto
  UK-Japan Symposium on Materials Under Extreme Conditions: Effects of Temperature, High Strain Rate and Irradiation, Sep. 2015, [International conference]
  English, Poster presentation, Oxford, UK
• Wave propagation on the interface of fluid-structure interaction　　　　　　　　　　　　　　　
  Tomohisa Kojima; Kazuaki Inaba; Kosuke Takahashi; Kikuo Kishimoto
  The 11th Doctoral student forum hosted by Eight-University Engineering Association, Oct. 2014, [Domestic conference]
  Japanese, Poster presentation

• Apr. 2024 - Present
  Experiments of Mechanical Engineering I (Stress and strain measurement), Saitama University, Undergraduate special subjects
• Apr. 2024 - Present
  Advanced Materials and Design, Saitama University, Postgraduate courses
• Apr. 2024 - Present
  Material engineering II, Saitama University, Undergraduate special subjects
• Apr. 2021 - Mar. 2024
  精密機械工学実験（鋼の熱処理と顕微鏡組織観察）, Chuo University, Undergraduate special subjects
• Apr. 2019 - Mar. 2021
  精密機械工学実験（CAD・CAE・CAM）, Chuo University, Undergraduate special subjects
• Apr. 2017 - Mar. 2021
  機械材料学2, Meiji University, Undergraduate special subjects
• Apr. 2017 - Mar. 2020
  材料力学演習, Meiji University, Undergraduate special subjects
• Apr. 2017 - Mar. 2019
  機械システム設計実習, Meiji University, Undergraduate special subjects
• Apr. 2017 - Mar. 2019
  機械設計製図2, Meiji University, Undergraduate special subjects

• 2024

• Dec. 2019 - Present, Society of Automotive Engineers of Japan
• Oct. 2018 - Present, THE SOCIETY OF MATERIALS SCIENCE, JAPAN
• Mar. 2018 - Present, The Japanese Society for Experimental Mechanics
• Jul. 2016 - Present, ASME
• Jun. 2015 - Present, THE JAPAN SOCIETY OF MECHANICAL ENGINEERS
• Jul. 2021 - Jun. 2024, DYMAT – European association for the promotion of research into the dynamic behaviour of materials and its applications
• Dec. 2019 - Nov. 2021, Japan Boiler Association
• Oct. 2018 - Apr. 2019, The Japanese Society of Clinical Sports Medicine

• Creation of an ultra-lightweight impact-absorbing metamaterial based on fractal structures　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Apr. 2024 - Mar. 2027
  Saitama University
  Grant amount(Total)：4550000, Direct funding：3500000, Indirect funding：1050000
  Grant number：24K07220
• Development of high strain rate testing equipment using underwater pressure wave to evaluate high strain rate properties of materials　　　　　　　　　　　　　　　
  Fluid Power Technology Promotion Foundation, Apr. 2024 - Mar. 2025
  Tomohisa Kojima, Saitama University, Principal investigator
  Competitive research funding
• Development of a cushioning package using a Kirigami-induced three-dimensional structure　　　　　　　　　　　　　　　
  Fuji Seal Foundation, Apr. 2024 - Mar. 2025
  Tomohisa Kojima, Saitama University, Principal investigator
  Competitive research funding
• Investigation into the mechanism of interfacial strength of polymeric resin/metal adhesive joint at ultra-high loading rates　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Apr. 2021 - Mar. 2025
  Chuo University
  Grant amount(Total)：17680000, Direct funding：13600000, Indirect funding：4080000
  Grant number：23K20905
• Creation of functional lattice structure for energy absorption of underwater pressure waves　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, Apr. 2021 - Mar. 2024
  Tomohisa Kojima, Chuo University, Principal investigator
  Grant amount(Total)：4680000, Direct funding：3600000, Indirect funding：1080000
  Grant number：21K14048
  講演・口頭発表等ID：36019178
• Design of micro-lattice structure design for superior impact energy absorption performance　　　　　　　　　　　　　　　
  Chuo University, Diversity Research Support, Support for Young Researchers, Support for Young Researchers, Oct. 2022 - Sep. 2023
  Tomohisa Kojima, Chuo University, Principal investigator
• 高い衝突安全性能を有するポリマーラティス構造部材の創出　　　　　　　　　　　　　　　
  Suzuki Foundation, 令和2年度 若手 科学技術研究助成, Apr. 2021 - Mar. 2022
  Tomohisa Kojima, Chuo University, Principal investigator
• Dynamic cavitation inception on the solid-fluid interface with fluid-structure interaction　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, Apr. 2018 - Mar. 2021
  Tomohisa Kojima, Principal investigator
  Grant amount(Total)：4160000, Direct funding：3200000, Indirect funding：960000
  Prediction of cavitation inception is extremely important for the lifetime evaluation of fluid machinery. In this study, an analogy between crack growth in fracture mechanics of solids and growth of cavitation bubble in a fluid is considered with the intention of applying it to the inception and propagation of cavitation wavefront under pressure wave propagation to propose a new theory for predicting the generation of dynamic cavitation wavefront. Experiments were conducted in which pressure waves were propagated to a bubble nucleus at a solid-fluid interface, then, the critical pressure for the bubble growth was determined. Referring Griffith's energy equilibrium derivation process showed that it is possible to derive an indicator that accurately predicts cavitation generation by considering the energy stored in the fluid itself due to compression caused by pressure fluctuations.
  Grant number：18K13662
  論文ID：40592305, 受賞ID：48546123
• Internal strain measurement of human brain model with actual human head shape and its application to concussion prevention in American Football　　　　　　　　　　　　　　　
  CASIO SCIENCE PROMOTION FOUNDATION, The 37th Research Grant, Dec. 2019 - Nov. 2020
  Tomohisa Kojima, Chuo University, Principal investigator
  Competitive research funding
  論文ID：32003720, 受賞ID：39812320
• Dynamic behavior and low velocity transverse impact response of fluid-conveying functionally graded shells under mechanical and thermal loads　　　　　　　　　　　　　　　
  The Japan Society for the Promotion of Science (JSPS), Bilateral Joint Research Projects, Joint Research with India (DST), Jun. 2017 - Mar. 2019
  Kazuaki Inaba; Amit Karmakar; Kikuo Kishimoto; Tomohisa Kojima; Ming Ji; Ziyi Su; Dipten Misra; Apurba Das, Others
  Competitive research funding

• 3D Printed Functional Structures　　　　　　　　　　　　　　　
  contribution
  The Saitama Shimbun, Saitama Newspaper, Sai-Tech column 590, 29 Jan. 2025 - 29 Jan. 2025
  general
• Impact Absorption Technology Enabled by 3D Printing　　　　　　　　　　　　　　　
  contribution
  SAITAMA Employers' Association, SAITAMA Employers' Association News No. 444, Plaza to meet researchers at Saitama University, 24 Jan. 2025 - 24 Jan. 2025
  company
• Introduction of Myself and My Research　　　　　　　　　　　　　　　
  contribution
  The Society of Materials Science, Japan, Journal of the Society of Materials Science, Japan, Members Communication, 15 Jul. 2022 - 15 Jul. 2022
  scientific_organization
• Presentation at 6th Technical Reception of the Resona Foundation for Small and Medium Enterprise Promotion　　　　　　　　　　　　　　　
  lecturer
  The Resona Foundation For Small And Medium Enterprise Promotion, 6th Technical Reception "The Frontiers of Digital Manufacturing", 09 Mar. 2022 - 09 Mar. 2022
  company
• Presentation at the 2019 Alumni Meeting of the Department of Precision Mechanics, Chuo University　　　　　　　　　　　　　　　
  lecturer
  The Graduate's Association of the Department of Precision Mechanics, Chuo University, The 2019 Alumni Meeting of the Department of Precision Mechanics, Chuo University, 28 Sep. 2019 - 28 Sep. 2019

• Evaluation of dynamic fracture toughness of a bonded bi-material interface subject to high-strain-rate shearing using digital image correlation　　　　　　　　　　　　　　　
  Other than myself, Advances in Engineering, Advances in Engineering website, Mechanical Engineering, Sep. 2021, [Internet]