Omiya, Masaki



Faculty of Science and Technology, Department of Mechanical Engineering (Yagami)



E-mail Address

E-mail address

Related Websites

External Links

Career 【 Display / hide

  • 1998.04

    Tokyo Institute of Technology, Department of Mechanical and Intelligent Systems Engineering, Associate Researcher

  • 2002.04

    Tokyo Institute of Technology, Department of Mechanical and Control Engineering, Associate Researcher

  • 2003.04

    Scientific High School of Tokyo Institute of Technology, 専攻科, Lecturer

  • 2007.04

    Keio University, Department of Mechanical Engineering, Assistant Professor

  • 2008.04

    青山学院大学, 理工学部, 非常勤講師

display all >>

Academic Background 【 Display / hide

  • 1996.03

    Tokyo Institute of Technology, Faculty of Engineering, Department of Mechanical and Production Engineering

    University, Graduated

  • 1998.03

    Tokyo Institute of Technology, Graduate School, Division of Science and Engineering, Department of Mechanical and Production Engineering

    Graduate School, Completed, Master's course

Academic Degrees 【 Display / hide

  • Doctor of Engineering, Tokyo Institute of Technology, Dissertation, 2005.10


Research Areas 【 Display / hide

  • Materials/Mechanics of materials (Machine Material/Material Mechanics)

Research Keywords 【 Display / hide

  • Delamination

  • Coating

  • Interface

  • Fracture

  • Thin film


Books 【 Display / hide

  • 楽しく学ぶ 破壊力学

    成田 史生,大宮 正毅,荒木 稚子, 朝倉書店, 2020.04,  Page: 129

  • Micro- and Opto-Electronic Materials and Structures: Physics, Mechanics, Design, Reliability, Packaging

    OMIYA Masaki, Kluwer Academic Publishers, 2007

  • 有機/金属・無機界面のメカニズム

    OMIYA Masaki, サイエンス&テクノロジー, 2006

    Scope: 202-211

  • 金属ナノ粒子ペーストのインクジェット微細配線

    Masaki OMIYA, Kikuo KISHIMOTO, シーエムシー出版, 2006

    Scope: 227-236

  • Fatigue of Materials

    OMIYA Masaki, 培風館, 2005.03

    Scope: 193-212, 277-325

Papers 【 Display / hide

  • A phase-field ductile fracture model with a variable regularization length parameter

    Han J., Nishi S., Takada K., Muramatsu M., Omiya M., Ogawa K., Oide K., Kobayashi T., Murata M., Moriguchi S., Terada K.

    Transactions of the Japan Society for Computational Engineering and Science (Transactions of the Japan Society for Computational Engineering and Science)  2020   1 - 15 2020

     View Summary

    © 2020 by the Japan Society for Computational Engineering and Science. In the last decade, one of the gradient damage models called “phase-field fracture model” has been receiving attention. The model for brittle fractures has acquired great success, but that for ductile fractures is still under development. In this context, we propose a novel phase-field model with a variable regularization length parameter that is defined as an increasing function of the measure of the plastic strain. Since the regularization length parameter l representing the width of a diffuse crack is known to determine the damaged region around the crack, it has been modified so as to increase depending on the amount of plastic deformation. Thanks to this variable regularization length parameter l∗, the phase-field parameter d is calculated in consideration of the damage due to plastic deformation. The conventional elasto-plastic model with J2 theory in plasticity is employed and couple to our proposed phase-field model. Several numerical examples are conducted to demonstrate the capability of our proposed model and validate the introduction of l∗ in comparison with the experimental result.

  • Role of size of rubber particles on failure mode and impact resistance characteristics of pc/abs blends and their abs constituents with a higher rubber content

    M. Nizar M., Masaki O., Hirotsugu I., Kikuo K.

    Defect and Diffusion Forum (Defect and Diffusion Forum)  402 DDF   1 - 6 2020

    ISSN  10120386

     View Summary

    © 2020 Trans Tech Publications Ltd, Switzerland. This study presents an experimental study on failure modes and resistances of polycarbonate (PC)/Acrylonitrile Butadiene Styrene (ABS) blends and their ABS constituents under a drop weight impact test (DWIT). Failure modes and impact resistances such as impact strength and impact toughness of such blends are generally influenced by molecular weight of the PC, rubber content and size of rubber particle in ABS system. A preliminary study on ABS materials using a DWIT showed that size of rubber particle not only determining their failure modes but also influencing their resistance characteristics. However, in a previous study performed using the similar DWIT on PC/ABS blends with a 10 wt% rubber content, it was revealed that size of rubber particle did not significantly influence their resistances. Their failure modes were even macroscopically very difficult to be distinguished. This study, hence, is aimed to further explore role of the size of rubber particle on failure mode and impact resistance characteristics of the PC/ABS blends and their ABS constituents with a higher rubber content. The impact test results have revealed that with a 20 wt% rubber content, size of rubber particle only influenced the resistances of the PC/ABS blends. It did not significantly contribute to affect failure mode of the PC/ABS blends. Whilst, it significantly influenced failure modes and resistances of the ABS. The DWIT results also re-confirmed that blending a brittle ABS into PC led to produce a tougher PC/ABS blend.

  • R-curve behavior of adhesively bonded composite joints with highly toughened epoxy adhesive under mixed mode conditions

    Kouno Y., Imanaka M., Hino R., Omiya M., Yoshida F.

    International Journal of Adhesion and Adhesives (International Journal of Adhesion and Adhesives)   2020

    ISSN  01437496

     View Summary

    © 2020 Elsevier Ltd The fracture toughness of an adhesively bonded carbon fiber reinforced plastic joint under mixed mode (I and II) conditions was determined by means of the Fernlund–Spelt type double cantilever beam (DCB) test, where a rubber-modified epoxy adhesive was used. The R curves were determined by calculating the energy release rates, GI and GII, based on the beam theory, along with a finite element analysis. The total energy release rate GT (= GI + GII) strongly depended on the I–II mixed mode. This means that it remarkably increased with increasing mode-II component; furthermore, it varied with crack growth from GTC (at the onset of cracking) to GTS (at the steady crack-propagation region). The difference between GTC and GTS increased with the increase in the mode II component. Such R-curve characteristics were discussed based on observation of the fracture surfaces with a scanning electron microscope and the corresponding crack propagation-path behavior.

  • Modelling and hydrogen-induced stress characterization of hydrogen-driven soft actuator using water splitting

    Omiya M., Kurokawa M.

    International Journal of Hydrogen Energy (International Journal of Hydrogen Energy)   2020

    ISSN  03603199

     View Summary

    © 2020 Hydrogen Energy Publications LLC Hydrogen production by water splitting is expected to be a significant power source in future because of its cleanness and environment-friendliness. In this study, an actuator driven by hydrogen produced by water splitting is studied and a hydrogen-induced stress model for a bimorph-type hydrogen actuator is developed. From the examination of the soft actuator having electrodes made of polyvinyl chloride with palladium electrode (Pd-PVC), the stress and bending moment induced by hydrogen absorption during water splitting are quantitatively evaluated. The results show that the thickness of the palladium electrode affects the mechanical performance of the Pd-PVC actuator, with the thinner palladium electrode showing a larger bending moment and tip displacement. A simple mechano-electro-chemical coupling equation is proposed to describe the relationship between bending moment, stress, and the electric charge used for water splitting. A palladium electrode soft actuator can work as a hydrogen generator/storage mechanism and as a mechanical actuator, and it can be useful for the power source of small systems or micro- or nano-devices.

  • Modelling of intracranial behaviour on occiput impact in judo

    Suzuki R., Omiya M., Hoshino H., Kamitani T., Miyazaki Y.

    Computer Methods in Biomechanics and Biomedical Engineering (Computer Methods in Biomechanics and Biomedical Engineering)  22 ( 8 ) 797 - 805 2019.06

    ISSN  10255842

     View Summary

    © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group. Acute subdural hematoma (ASDH) sometimes occurred in judo because of the bridging veins’ failure by rotation of the brain in the skull. However, the relationship between intracranial behaviour and the motion of the body on occiput impact has not yet been clarified. In this study, we developed an intracranial mechanical model based on multibody dynamics and compared it with experimental results. The results show the importance of modelling bridging veins and cerebral spinal fluid to the relative displacement between brain and skull. The proposed model will contribute to accident analyses or the optimum design of supporting devices.

display all >>

Papers, etc., Registered in KOARA 【 Display / hide

Reviews, Commentaries, etc. 【 Display / hide

  • ⅩⅣ.Physics of Adhesion (4)Damage-based Cohesive Zone Model

    OMIYA Masaki

    日本接着学会誌 48 ( 2 )  2012

    Introduction and explanation (scientific journal), Single Work

Presentations 【 Display / hide

  • Influence of Electrode Young's modulus on Deformation Behavior of Ionic Polymer Metal Composite Actuator with Palladium Electrodes

    KAWAI Tomoki, OMIYA Masaki

    Asia-Pacific Conference on Fracture and Strength 2016 (APCFS2016) (Toyama, Japan) , 2016.09, Oral Presentation(general), KSME-MFD, CMES-IMME, AFG, JSME-MMD

  • Measurement of Dynamic Mechanical Properties by Collision of Hard Particles

    KITA Akihiro, OMIYA Masaki, OTA shunpei and KOMOTORI Jun

    Asia-Pacific Conference on Fracture and Strength (APCFS2016) (Toyama, Japan) , 2016.09, Oral Presentation(general), KSME-MFD, CMES-IMME, AFG, JSME-MMD

  • Analysis of Cable Dynamics for Ground Power Operated Gondola Type Space Elevator

    SASAKI Hidemi, OMIYA Masaki, HOSHINO Hiroaki

    The 4th Joint International Conference on Multibody System Dynamics (Montreal, Canada) , 2016.05, Oral Presentation(general)

     View Summary

    A space elevator has been proposed as a future space transportation system. It is the concept of the space elevator to stretch a cable from the surface of the Earth by the centrifugal force of rotation, and to use it for transporting cargo into space.
    Two types of the space elevator have been proposed, based on the operation method. One is a climber type, which is operated by self-climbing carriers that are called “climber”. Second is a gondola type, which is operated by stationary power via the cable. A lot of studies about the climber type have been carried out from 1990s. By contrast, the gondola type has not been studied well, because the gondola type has disadvantages such as the requirement of high mechanical strength for power source elements.
    Therefore, in this report, we suggest Ground Power Operated Gondola Type Space Elevator, as shown in Fig.1, and consider its cable dynamics such as a method which is commonly used for the climber type. The greatest characteristic of the suggested space elevator is the circulating of the cable, which has an advantageous in maintenance of the cable.


  • A study on plastic ηpl approach in J and CTOD estimations for clamped SENT specimens

    Enyang wang, Masaki Omiya

    3rd International Workshops on Advances in Computational Mechanics (Tokyo, Japan) , 2015.10, Oral Presentation(guest/special), Japan Society for Computational Engineering and Science

  • 破壊予測のためのシミュレーション技術

    大宮 正毅

    Mechanical Designユーザー会 (東京都) , 2015.07, Oral Presentation(guest/special), 株式会社メカニカルデザイン

display all >>

Research Projects of Competitive Funds, etc. 【 Display / hide

  • 水素吸蔵型イオン導電性ハイブリッドアクチュエータの機械的・電気化学的特性評価


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 大宮 正毅, Grant-in-Aid for Scientific Research (C), Principal Investigator

  • Mechanical and Electrochemical Damage Mechanism of Ionic Polymer Metal Composite Actuators


    MEXT,JSPS, Grant-in-Aid for Scientific Research, 大宮 正毅, Grant-in-Aid for Scientific Research (C), Principal Investigator

Intellectual Property Rights, etc. 【 Display / hide

  • 最適化計算装置、最適化計算方法及びプログラム

    Application No.: 特願2018-017652  2018.02 

    Patent, Joint, National application

  • 半導体集積回路の配線構造設計装置

    Application No.: 特願2014-211318  2014.10 

    Patent, Joint, National application

  • 構造物荷重伝達計算装置

    Application No.: 特願2013-131205  2013.06 

    Announcement No.: 特開2015-5230  2015.01 

    Patent, Joint, National application

  • 表層密着強度測定方法および装置

    Application No.: 特願2009-223824  2009.09 

    Announcement No.: 特開2011-75286  2011.04 

    Patent, Joint, National application

  • 誘電経路の数値解析装置

    Application No.: 特願2009-191632  2009.08 

    Announcement No.: 特開2011-43982  2011.03 

    Patent, Joint, National application

display all >>

Awards 【 Display / hide

  • 2013 Best Paper Award

    Yusuke Kai, Masaki Omiya, Yuki Kitayama, Hideyuki Kumei, Tomoaki Uchiyama, 2014.06, ASME, American Society of Mechanical Engineer, In-situ Observation of Deformation Behavior of MEA under Humidity Cycles

    Type of Award: International Academic Awards.  Country: USA

  • 日本機械学会関東支部神奈川ブロック貢献賞

    2013.11, 日本機械学会関東支部神奈川ブロック

    Type of Award: Awards of National Conference, Council and Symposium.  Country: 日本

  • 日本機械学会奨励賞(研究)

    OMIYA Masaki, 2007.04, 日本機械学会, 異種接着・接合界面の力学モデルの構築と界面強度評価法の研究

    Type of Award: Awards of National Conference, Council and Symposium

  • Ohji-Ohtsuka-Okamura Award, Japan Society of Material Science

    OMIYA Masaki, 2006.10, 日本材料学会

    Type of Award: Awards of National Conference, Council and Symposium

  • 日本材料学会学術講演優秀発表賞

    OMIYA Masaki, 2006.05, 日本材料学会

    Type of Award: Awards of National Conference, Council and Symposium

display all >>


Courses Taught 【 Display / hide











display all >>

Courses Previously Taught 【 Display / hide

  • 材料力学の基礎

    Keio University, 2016, Spring Semester, Major subject, Lecture, Within own faculty, 1h, 52people

  • 材料強度学

    Keio University, 2016, Autumn Semester, Major subject, Lecture, Within own faculty, 1h

  • 形状情報の表現

    Keio University, 2016, Autumn Semester, Major subject, Laboratory work/practical work/exercise, Within own faculty, 2h

  • 材料と構造の強度学

    Keio University, 2016, Autumn Semester, Major subject, Lecture, 1h

  • マルチディシプリナリ科学特別講義

    Keio University, 2016, Spring Semester, Major subject, Lecture

display all >>


Social Activities 【 Display / hide

  • International Journal of Theoretical and Applied Multiscale Mechanics


Memberships in Academic Societies 【 Display / hide

  • 日本臨床スポーツ医学会, 

  • 日本塑性加工学会, 

  • 自動車技術会構造強度部門, 

  • 自動車技術会, 

  • Japan Society of Material Science, 


display all >>

Committee Experiences 【 Display / hide

  • 2016.05

    委員, 日本材料学会企画・広報委員会

  • 2016.04

    委員長, 自動車技術会構造強度部門委員会

  • 2016.04

    幹事, 日本機械学会材料力学部門

  • 2015.08

    講師, 日本材料学会主催 第25回初心者のための疲労設計講習会

  • 2015.04

    主査, 自動車技術会構造強度部門委員会き裂進展WG

display all >>