Oya, Tetsuo

写真a

Affiliation

Faculty of Science and Technology, Department of System Design Engineering (Yagami)

Position

Associate Professor

Related Websites

External Links
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Career 【 Display / hide 】

  • 2005.04
    -
    2008.03

    豊田工業大学

  • 2008.04
    -
    2010.03

    東京大学生産技術研究所

  • 2009.09
    -
    2011.03

    玉川大学

  • 2010.04
    -
    2014.03

    東京大学生産技術研究所

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Academic Background 【 Display / hide 】

  • 2000.03

    Tohoku University, Faculty of Engineering, 機械電子工学科

    University, Graduated

  • 2005.03

    Tohoku University, Graduate School, Division of Information Science, システム情報科学専攻

    Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • Dr., Tohoku University, Coursework, 2005.03

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Research Areas 【 Display / hide 】

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering (Plasticity/Production Engineering/Processing Studies)

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Design engineering (CAE/Design Engineering)

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Research Keywords 【 Display / hide 】

  • Theory of plasticity, Crystal plasticity

  • Forming analysis, Forming limit prediction

  • Press forming CAE, Numerical material testing

  • Optimal design, Product design

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Research Themes 【 Display / hide 】

  • Forming limit prediction based on bifurcation theory, 

    2014
    -
    Present

  • Numerical material testing based on finite element polycrystal model, 

    2016
    -
    Present

  • Cooling design based on multiphysics simulation, 

    2020
    -
    2023

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Papers 【 Display / hide 】

  • Numerical Material Testing Method for Hexagonal Close-Packed Metals Based on a Strain-Rate-Independent Finite Element Polycrystal Model

    Vago G., Oya T.

    Crystals 13 ( 9 )  2023.09

    Research paper (scientific journal), Joint Work, Accepted

  • Forming analysis on the effect of ultra-thinning of sheet metals based on a stress rate direction-dependent constitutive model

    T. Oya, K. Ito, G. Uemura and N. Mori

    Lecture Notes in Mechanical Engineering (Springer)     243 - 253 2023.09

    Research paper (international conference proceedings), Joint Work, Lead author, Accepted

  • Formability evaluation based on a constitutive model with stress rate direction dependency considering bifurcation modes

    T. Oya, K. Ito, G. Uemura and N. Mori

    IOP Conference Series: Materials Science and Engineering  ( 1284 )  2023.06

    Research paper (international conference proceedings), Joint Work, Lead author, Accepted

  • Formability mechanism of CFRP sheets using multiscale model based on microscopic characteristics of thermosetting resin

    Oya T., Nishino A.

    Multiscale and Multidisciplinary Modeling, Experiments and Design (Multiscale and Multidisciplinary Modeling, Experiments and Design)  4 ( 1 ) 65 - 76 2021.03

    　View Summary

    This study was undertaken to attempt to establish the press-forming of carbon fiber-reinforced plastic (CFRP) sheets through a forming simulation. Since press-forming induces large plastic deformation of a material, a reliable simulation requires accurate modeling of the plastic deformation of resin. However, there has been little research on the deformation mechanism of thermosetting resins under large plastic forming, which is targeted in this study, and therefore no appropriate plastic deformation model of a resin has been established. Thus, a new model was constructed for a thermosetting resin on the basis of plastic deformation characteristics considering the microscopic mechanism. In the proposed model, the breakage of molecular chains of a thermosetting resin is considered. A molecular dynamics simulation of epoxy resin determined the effect of this molecular chain breakage. It was confirmed that the proposed model can appropriately represent the mechanical characteristics of an actual thermosetting resin. Furthermore, using this model, the numerical analysis of a CFRP sheet through its representative volume element was carried out, and the result explained the improved formability of CFRP at high temperatures, as observed in related experiments.

  • A novel multiscale computational methodology for numerical material testing based on finite element polycrystal model

    Oya T., Araki N.

    Materials Today Communications (Materials Today Communications)  33 2022.12

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

    　View Summary

    In this paper, a novel computational procedure for numerical material testing method based on a strain rate-independent crystal plasticity model and an optimization scheme is presented. In order to simulate deformation of materials that exhibit mechanical anisotropy with high accuracy, it is necessary to apply material models that include many material parameters. Therefore, if difficult-to-perform material tests such as biaxial tests can be replaced by numerical material tests, the cost and time required for experiments can be significantly reduced. The proposed method was developed using a crystal plasticity-based finite element model, known as finite element polycrystal model (FEPM), and an optimization scheme based on a genetic algorithm (GA) for microscopic parameters. FEPM is a model that performs analysis while determining the activity of all slip systems without using the strain rate-dependent constitutive law that is commonly used and is suitable for numerical material testing because it has less physical ambiguity. In the optimization process, deformation anisotropy is related to the grain orientation expressed by the Euler angle, and yield stress anisotropy is related to the work-hardening coefficients of the slip system. In addition, by generating pseudo-anisotropic crystal orientation by numerical rolling, the need for crystal orientation observation is eliminated. In this paper, after giving a description of the proposed method, experimental verifications on aluminum alloys to prove the effectiveness of the proposed method are presented.

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Reviews, Commentaries, etc. 【 Display / hide 】

  • 有限要素多結晶モデルによる結晶塑性解析の特徴と実例

    大家哲朗

    ぷらすとす(日本塑性加工学会誌) 6 ( 61 ) 24 - 28 2023.01

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

  • 熱硬化性CFRPのプレス成形性向上に向けた樹脂の力学的挙動のマルチスケール解析

    大家哲朗

    CFRP/CFRTPの界面制御、成形加工技術と部材応用 (技術情報協会)     213 - 223 2020.12

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Lead author

  • Problems and Solutions of Plastic Constitutive Equation Based on Associated Flow Rule

    OYA Tetsuo, ITO Koichi

    Journal of the Japan Society for Technology of Plasticity (The Japan Society for Technology of Plasticity)  57 ( 662 ) 188 - 193 2016.03

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

  • On the Theory of Fracture Prediction in Metal Forming

    OYA Tetsuo, ITO Koichi

    Journal of the Japan Society for Technology of Plasticity (The Japan Society for Technology of Plasticity)  56 ( 658 ) 914 - 919 2015.11

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

  • Fundamentals in Generating Surfaces of Industrial Design (2) Expression by Subdivision Surfaces

    HIGASHI Masatake, OYA Tetsuo

    Journal of the Japan Society for Precision Engineering (The Japan Society for Precision Engineering)  80 ( 10 ) 914 - 917 2014.10

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

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Presentations 【 Display / hide 】

  • 成形限界予測に及ぼす材料特性および応力増分方向依存性の影響

    大家哲朗

    第74回塑性加工連合講演会 (富山市) , 

    2023.11
    , 

    Oral presentation (general), 日本塑性加工学会

  • 非関連流れ則および応力増分方向依存性塑性構成式に基づく極薄板材の引張り解析(第2報)

    大家哲朗，伊藤耿一，植村元，森尚逹

    第73回塑性加工連合講演会, 

    2022.11
    , 

    Oral presentation (general)

  • 塑性加工中の多結晶材料の加工硬化挙動に及ぼす微視構造の影響(第3報)

    大家哲朗，伊藤耿一

    第73回塑性加工連合講演会, 

    2022.11
    , 

    Oral presentation (general)

  • マルチフィジクス解析を用いた形状最適化によるγ線コンバータの上流部設計

    山本寛人，大家哲朗

    日本機械学会第35回計算力学講演会（CMD2022）, 

    2022.11
    , 

    Oral presentation (general)

  • 引張り変形下における極薄板の塑性変形挙動 -FEM 解析への非関連流れ則に基づく応力増分方向依存性塑性構成式の導入

    大家哲朗

    日本機械学会 M&M2022 材料力学カンファレンス, 

    2022.09
    , 

    Oral presentation (general)

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

  • プレス加工DXの促進に資する塑性理論モデルと数値材料試験法の構築

    2023.09
    -
    2026.03

    天田財団, Commissioned ｒesearch, Principal investigator

  • プロセスチェイン統合型塑性加工CAEシステムの構築

    2023.04
    -
    2026.03

    日本学術振興会, 科学研究費助成事業, Research grant, Principal investigator

  • 微視的変形機構を考慮したマルチスケール数値材料試験による一般化材料モデルの構築

    2018.04
    -
    2021.03

    日本学術振興会, Grant-in-Aid for Scientific Research, Research grant, Principal investigator

  • 高精度破断予測を目的とした異方性塑性構成式に関する研究

    2015.10
    -
    2018.03

    天田財団, 一般研究開発助成, Research grant, Principal investigator

  • 熱硬化CFRP の連続薄板化・100℃成形加工・塑性接合による極限軽量構造の具現化

    2014.04
    -
    2019.03

    日本学術振興会, Grant-in-Aid for Scientific Research, Research grant, Coinvestigator(s)

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Awards 【 Display / hide 】

  • 東京・南関東支部奨励賞

    2017.04, 日本塑性加工学会

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

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Courses Taught 【 Display / hide 】

  • DESIGN LITERACY EXERCISE

    2024

  • BASIC EXERCISE ON SYSTEM DESIGN ENGINEERING

    2024

  • BACHELOR'S THESIS

    2024

  • DIGITAL SYNTHESIS OF FORMING PROCESSES

    2024

  • STRUCTURAL SYSTEM

    2024

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Courses Previously Taught 【 Display / hide 】

  • デザインリテラシー演習

    Keio University

    2018.04
    -
    2019.03
    , 

    Spring Semester, Seminar, Lecturer outside of Keio, 70people

  • 非線形固体力学

    Keio University

    2018.04
    -
    2019.03
    , 

    Autumn Semester, Lecture, Lecturer outside of Keio, 10people

  • 設計・計画の最適化数理

    Keio University

    2018.04
    -
    2019.03
    , 

    Autumn Semester, Lecture, Lecturer outside of Keio, 50people

  • 構造システム工学

    Keio University

    2018.04
    -
    2019.03
    , 

    Autumn Semester, Lecture, Within own ｆaculty, 40people

  • 自然科学実験物理学編

    Keio University

    2018.04
    -
    2019.03
    , 

    Autumn Semester, Laboratory work/practical work/exercise, Lecturer outside of Keio

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Memberships in Academic Societies 【 Display / hide 】

  • 自動車技術会, 

    2014.06
    -
    Present

  • 日本設計工学会, 

    2012.05
    -
    Present

  • 日本鉄鋼協会, 

    2012.03
    -
    Present

  • 日本塑性加工学会, 

    2008.05
    -
    Present

  • 精密工学会, 

    2005.06
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2024.06
    -
    Present

    代議員, 日本塑性加工学会

  • 2018.04
    -
    Present

    商議員，庶務幹事(2021〜2022年度)，会計幹事(2023年度〜), 日本塑性加工学会　東京・南関東支部

  • 2016.04
    -
    Present

    創形創質工学部会・運営委員, 日本鉄鋼協会

  • 2021.04
    -
    2024.03

    校閲委員, 日本塑性加工学会

  • 2012.05
    -
    2020.05

    校閲委員，特別投稿担当幹事, 日本設計工学会

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