Oya, Tetsuo

写真a

Affiliation

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

Position

Associate Professor

E-mail Address

E-mail address

Related Websites

External Links
Scopus Paper Info  
Paper Count: 63 Citation Count: 280 h-index: 7

Click to view the Scopus page. The data was downloaded from Scopus API in July 19, 2026, via http://api.elsevier.com and http://www.scopus.com .

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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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Books 【 Display / hide 】

  • CFRP/CFRTPの界面制御，成形加工技術と部材応用

    大家哲朗, 技術情報協会, 2020.12

    Scope: 第7章第3節

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Papers 【 Display / hide 】

  • Dependence of Localized Necking Behavior on the Specimen Shapes in Tensile Testing of Ultra-Thin Copper Alloy Sheet

    Ueshima N., Oya T., Oikawa K., Ito K., Hyodo H., Yorifuji H.

    Journal of Engineering Materials and Technology (The American Society of Mechanical Engineers)  148 ( 3 ) 031005 2026.07

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  00944289

    　View Summary

    The effect of specimen shape on the fracture angle in tensile testing of copper alloy sheets was investigated. Specimens with a width-to-thickness ratio of more than 30 were investigated, and it was found that relatively thick and narrow copper alloy sheets exhibited a fracture angle oblique to the loading direction. In contrast, the fracture angle was perpendicular to the loading direction in the thinner and wider specimens. To understand the mechanism of the change in fracture direction, digital image correlation (DIC) analysis was performed. The DIC analysis showed that the oblique localizations of the strain rate appeared in two directions in any thickness and width after diffuse necking. In thick specimens, one of the localizations was selected by the oblique fracture. In contrast, two localizations remained until the perpendicular fracture in thin and wide specimens. The analysis of the ratio of local strain rate revealed that the length strain over width strain was basically unchanged until fracture. However, in a few cases, the length strain over width strain drastically changed just before the fracture. These results suggest that the remaining two localized strain rates and the change in the strain state lead to the perpendicular fracture in thin and wide specimen. Regarding the edge of the specimen, the fracture angle tends to be oblique. This is presumably due to the less constrained condition of the edge, which is the possible reason for the oblique fracture of the narrow specimen.

  • An evolutionary algorithm-based numerical material testing system based on a crystal plasticity finite element model

    Koki Komatsu, Tetsuo Oya

    MATEC Web of Conferences (EDP Sciences)  408 2025.05

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

  • 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,  ISSN  21954356

    　View Summary

    In formability evaluation, it is important to accurately predict the onset timing and morphology of fracture in a workpiece from a physical point of view. The authors have developed a material model based on the stress rate direction-dependent constitutive equation, which is a non-normality law model, and applied it to forming analyses. The authors have also developed a forming limit prediction method based on the three-dimensional local bifurcation theory, which can theoretically predict the forming limits of arbitrary sheet and bulk metals. In this study, these methods are applied to evaluate the formability of thin and ultra-thin metallic sheets. The proposed model was applied to a square cylinder drawing analysis, and the accurate evaluation of the local necking allowed us to capture the transition of the fracture zone in response to changes in the amount of corner cut. In addition, appropriate forming parameters for ultra-thin sheets were also investigated. These analyses demonstrated the validity and usefulness of the proposed stress rate direction-dependent constitutive model.

  • 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

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Reviews, Commentaries, etc. 【 Display / hide 】

  • Local bifurcation as forming limit and plastic constitutive equation

    大家哲朗

    ぷらすとす(日本塑性加工学会誌) (日本塑性加工学会)  7 ( 79 ) 425 - 430 2024.07

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

  • 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

  • 積層板のプレス加工における解析方法

    大家哲朗，柳本潤

    Science of machine (養賢堂)  71 ( 5 ) 341 - 348 2019.05

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Joint Work, 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

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Presentations 【 Display / hide 】

  • Simple shear test for a work-hardening curve in the large strain to improve forming simulation accuracy

    Tetsuo Oya

    [International presentation]  LEM21 2025, 

    2025.12
    , 

    Oral presentation (general)

  • The effect of the crystal work-hardening law in numerical material testing method on forming simulations

    Koki Komatsu and Tetsuo Oya

    [International presentation]  LEM21, 

    2025.12
    , 

    Oral presentation (general)

  • Optimization of crystallographic orientation using CP-FEM for AI-assisted material processing

    Koki Komatsu and Tetsuo Oya

    [International presentation]  AWMFT/APSTP2025, 

    2025.11
    , 

    Oral presentation (general)

  • 応力増分方向依存性塑性構成式を用いた分岐理論に基づく薄板材のセレーション挙動解析(第2報)

    大家哲朗，伊藤耿一

    [Domestic presentation]  第76回塑性加工連合講演会, 

    2025.09
    -
    2026.09
    , 

    Oral presentation (general)

  • 逐次累積法に基づく結晶塑性FEM によるBCC 材料の数値材料試験法(第2報)

    小松航喜，大家哲朗

    [Domestic presentation]  第76回塑性加工連合講演会, 

    2025.09
    , 

    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 】

  • SYSTEM DESIGN ENGINEERING PRACTICAL RESEARCH (INTERNATIONAL) B

    2026

  • SYSTEM DESIGN ENGINEERING PRACTICAL RESEARCH (INTERNATIONAL) A

    2026

  • ADVANCED DESIGN AND PRODUCTION SYSTEM

    2026

  • DOCTORAL RESEARCH ON ENGINEERING AND DESIGN

    2026

  • LABORATORY IN SCIENCE

    2026

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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 】

  • 2025.06
    -
    Present

    論文誌編集理事, 日本塑性加工学会

  • 2024.06
    -
    Present

    代議員, 日本塑性加工学会

  • 2018.04
    -
    Present

    商議員(継続中)，庶務幹事(2021〜2022年度)，会計幹事(2023年度〜2024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

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