Omiya, Masaki

写真a

Affiliation

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

Position

Professor

Related Websites

External Links
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Career 【 Display / hide 】

  • 1998.04
    -
    2002.03

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

  • 2002.04
    -
    2007.03

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

  • 2003.04
    -
    2007.03

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

  • 2007.04
    -
    2010.03

    Keio University, Department of Mechanical Engineering, Assistant Professor

  • 2008.04
    -
    2009.03

    青山学院大学, 理工学部, 非常勤講師

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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

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Academic Degrees 【 Display / hide 】

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

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Research Areas 【 Display / hide 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials (Machine Material/Material Mechanics)

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Research Keywords 【 Display / hide 】

  • Delamination

  • Coating

  • Interface

  • Fracture

  • Thin film

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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

  • 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

  • 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

  • Fatigue of Materials

    OMIYA Masaki, 培風館, 2005.03

    Scope: 193-212, 277-325

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Papers 【 Display / hide 】

  • Design and fabrication of micro and nano surface structures for enhancing metal–polymer adhesion using femtosecond laser treatment

    Omiya M., Nakajima A., Yan J.

    Materials and Design （Materials and Design)  224 2022.12

    ISSN  02641275

    　View Summary

    This study investigated the effects of micro- and nanostructures on the adhesion strength between copper and an encapsulating mold compound (EMC). The shape of the microgrooves was designed based on fracture mechanics theory, and the effect of laser-induced periodic structure surface (LIPSS) formation on the microgroove was investigated using numerical simulations. The designed surface profiles were fabricated using femtosecond laser treatments, and the adhesion strength between copper and the EMC was evaluated. The results show that deep microgrooves improved the adhesion strength owing to the anchor effect. However, the aspect ratio between the pitch and depth of the microgroove had a limitation in enhancing the adhesion strength. The formation of LIPSSs on the mountaintop of the microgroove was very effective; however, an LIPSS on the valley of the microgroove was ineffective. Numerical analyses revealed that LIPSSs suppressed the shear deformation of the EMC and worked as resistance to interface delamination. Based on the findings obtained in this study, combining micro- and nano-scale surface structure formation with femtosecond laser treatments is an effective and eco-friendly method for improving adhesion strength.

  • Effect of rubber modification on fracture toughness of epoxy adhesives under mode I and mode II loading

    Makoto Imanaka, Masaki Omiya, Keisuke Hara, Hayato Nakatani

    Theoretical and Applied Fracture Mechanics （Elsevier)  122   103604 2022.09

    Research paper (scientific journal), Joint Work, Corresponding author, Accepted,  ISSN  01678442

    　View Summary

    In the present study, the effects of rubber modification on the joint strength and fracture toughness of epoxy adhesives under mode I and II loading were investigated using Arcan-type adhesively bonded joints. The results of the fracture tests under mode I loading revealed the occurrence of stress whitening owing to triaxial tensile stresses near the crack tip. The joint strength and fracture toughness were calculated using the J-integral value, where the adhesive layer was considered as an elastic–plastic material. The crack-growth energy was also calculated using the J-integral value, where the adhesive layer was considered as an elastic material. The results revealed that rubber modification under mode I loading induced an increase in the joint strength, fracture toughness, and crack-growth energy. Rubber modification under mode II loading did not induce stress whitening near the crack tip owing to low triaxial tensile stresses. However, macroscopic void growth and significant plastic deformation were observed in the adhesive layer. Rubber modification induced a slight decrease in the joint strength; however, it induced a significant increase in the fracture toughness owing to the growth of the plastic zone in the adhesive layer. The calculated crack-growth energy decreased slightly, in accordance with the joint strength. It was concluded that rubber modification contributed to an increase in the crack-growth resistance under mode I loading and not under mode II loading. Furthermore, a correlation was observed between the joint strength and crack-growth energy.

  • Influence of strength and notch shape on crack initiation and propagation behavior of advanced high strength steel sheets

    Masaki Omiya, Seiya Arakawa, Zhenduo Yao, Mayu Muramatsu, Shinnosuke Nishi, Kenji Takada, Masanobu Murata, Kazuaki Okato, Kensuke Ogawa, Kai Oide, Takaya Kobayashi, Jike Han, Kenjiro Terada

    Engineering Fracture Mechanics （Elsevier)  271   108573 2022.06

    Research paper (scientific journal), Joint Work, Lead author, Corresponding author, Accepted,  ISSN  00137944

    　View Summary

    Advanced high-strength steels (AHSSs) are widely adopted in car body structures to achieve weight reduction for energy efficiency and crash safety. This study investigates the effects of material strength and notch shapes on crack initiation and propagation behaviors in AHSS sheets used in car body structures. Tensile tests were conducted for three types of Japanese grade AHSS (JSC590, JSC980, and JSC1180) specimens and two notch root radii (R0.5 and R5). The crack initiation and propagation behaviors were found to strongly depend on the material strength and notch root radius. The crack generated from the notch root for the R0.5 specimens, whereas it generated from 1 to 2 mm inside the notch root for the R5 specimens. Unstable crack propagation occurred beyond the maximum load for the R5 and JSC1180 specimens, whereas only stable crack propagation occurred for the R0.5 specimens. From the digital image correlation analyses, we found that the specimen notch radius affects the stress triaxiality and equivalent plastic strain around the notch root. The JSC980 material had the highest crack initiation energy, which correlates with the plastic dissipation energy utilized for thickness reduction. The JSC590 material exhibited the highest crack propagation energy, which correlates with the true fracture strain.

  • 圧延方向が及ぼす薄板 Cu-Sn-P 銅合金条材の疲労き裂進展特性への影響

    土屋朱美果，三田夏大，大宮正毅

    日本材料学会第71期学術講演会講演論文集 （日本材料学会)  405   1 - 2 2022.05

    Research paper (conference, symposium, etc.), Joint Work, Last author, Corresponding author

  • Evaluation of thermal fatigue crack propagation in underfill resin materials for electronic packages

    Watanabe Y., Yamaguchi H., Enomoto T., Ogawa K., Kobayashi T., Omiya M.

    Fatigue and Fracture of Engineering Materials and Structures （Wiley)  45 （ 5 ） 1349 - 1360 2022.05

    Research paper (scientific journal), Last author, Corresponding author, Accepted,  ISSN  8756758X

    　View Summary

    To improve the fatigue life of electronic packages, it is necessary to clarify thermal fatigue characteristics of underfill resin materials. In this study, a new setup for measuring thermal fatigue crack growth was developed, and the effects of thermal cycle conditions and silica filler contents on fatigue crack propagation were investigated. The results show that the likelihood of crack initiation increased with the filler content and the temperature of the thermal cycles. Comparing the results with those from mechanical fatigue tests, crack initiation and propagation occurred at lower ΔK and the crack growth rates were higher for thermal fatigue. Observations of the fracture surface revealed that the cracks propagated inside the underfill resin, which resulted in smaller crack growth resistance than that in mechanical fatigue. The addition of fillers introduced a crack propagation path at the interface between fillers and resins and enhanced the crack propagation resistance in thermal fatigue.

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

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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

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

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Presentations 【 Display / hide 】

  • 自動車用高強度薄板鋼板におけるき裂発生・進展挙動計測とその予測

    大宮正毅

    大阪大学接合科学研究所国際連携溶接計算科学研究拠点第 14 回講演会 (大阪) , 

    2022.03
    , 

    Oral presentation (keynote), 大阪大学接合科学研究所

  • Fracture and Strength of Advanced High Strength Steels for Car Body Structures

    Masaki Omiya

    2022 International Joint Symposium on Convergence Technology of Mechanical Engineering (Online) , 

    2022.01
    , 

    Oral presentation (invited, special), Chonnam National University, Hanyang University

  • Hydrogen-assisted ionic polymer metal composite (IPMC) actuator

    M. Omiya, M. Kurokawa

    The 7th Asian Conference on Mechanics of Functional Materials and Structures (ACMFMS2020+1), 

    2021.03
    , 

    Oral presentation (general)

  • Ductile-Brittle Transition of Crack Propagation for Automotive Advanced High Strength Steels

    Masaki Omiya, Mayu Muramatsu, Kenji Takada, Kensuke Ogawa, Kai Oide, Takaya Kobayashi and Kenjiro Terada

    Asian Pacific Congress on Computational Mechanics (APCOM) (Taipei) , 

    2019.12
    , 

    Oral presentation (general)

  • Measurement of J Integral Values of Adhesive Joints between CFRP and Aluminum Alloy by Digital Image Correlation Method under Mixed mode Loadings

    S. Shimamoto, M Omiya

    5th International Conference on Material and Reliability (Jeju) , 

    2019.11
    , 

    Oral presentation (general)

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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

    2018.04
    -
    2021.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Research grant, Principal investigator

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

    2015.04
    -
    2018.03

    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Research grant, Principal investigator

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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

    Date applied： 特願2018-017652  2018.02 

    Patent, Joint

  • 半導体集積回路の配線構造設計装置

    Date applied： 特願2014-211318  2014.10 

    Patent, Joint

  • 構造物荷重伝達計算装置

    Date applied： 特願2013-131205  2013.06 

    Date announced： 特開2015-5230  2015.01 

    Patent, Joint

  • 表層密着強度測定方法および装置

    Date applied： 特願2009-223824  2009.09 

    Date announced： 特開2011-75286  2011.04 

    Patent, Joint

  • 誘電経路の数値解析装置

    Date applied： 特願2009-191632  2009.08 

    Date announced： 特開2011-43982  2011.03 

    Patent, Joint

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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 award (Japan or overseas),  Country： United States

  • 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： Award from Japanese society, conference, symposium, etc.

  • 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： Award from Japanese society, conference, symposium, etc.

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

    OMIYA Masaki, 2006.10, 日本材料学会

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 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： Award from Japanese society, conference, symposium, etc.

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Courses Taught 【 Display / hide 】

  • STRENGTH AND FRACTURE OF MATERIALS

    2023

  • STRENGTH AND FRACTURE OF MATERIALS

    2023

  • SPECIAL LECTURE SERIES ON MULTIDISCIPLINARY AND DESIGN SCIENCE

    2023

  • INTRODUCTION TO MECHANICS OF MATERIALS

    2023

  • INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

    2023

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Courses Previously Taught 【 Display / hide 】

  • 材料力学の基礎

    Keio University

    2016.04
    -
    2017.03
    , 

    Spring Semester, Lecture, Within own ｆaculty, 1h, 52people

  • 材料強度学

    Keio University

    2016.04
    -
    2017.03
    , 

    Autumn Semester, Lecture, Within own ｆaculty, 1h

  • 形状情報の表現

    Keio University

    2016.04
    -
    2017.03
    , 

    Autumn Semester, Laboratory work/practical work/exercise, Within own ｆaculty, 2h

  • 材料と構造の強度学

    Keio University

    2016.04
    -
    2017.03
    , 

    Autumn Semester, Lecture, 1h

  • マルチディシプリナリ科学特別講義

    Keio University

    2016.04
    -
    2017.03
    , 

    Spring Semester, Lecture

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Social Activities 【 Display / hide 】

  • International Journal of Theoretical and Applied Multiscale Mechanics

    2009.01
    -
    Present
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Memberships in Academic Societies 【 Display / hide 】

  • 日本臨床スポーツ医学会, 

    2014.10
    -
    Present

  • 日本塑性加工学会, 

    2008.04
    -
    Present

  • 自動車技術会構造強度部門, 

    2008.03
    -
    Present

  • 自動車技術会, 

    2007.07
    -
    Present

  • Japan Society of Material Science, 

    2007.07
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2022.05
    -
    Present

    支部長, 日本材料学会関東支部

  • 2018.05
    -
    2020.04

    理事, 日本材料学会

  • 2018.04
    -
    2020.03

    庶務幹事, 日本機械学会関東支部

  • 2016.05
    -
    Present

    委員, 日本材料学会企画・広報委員会

  • 2016.04
    -
    2020.03

    委員長, 自動車技術会構造強度部門委員会

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