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Development of multiscale polycrystal plasticity model based on discrete dislocation dynamics

Research Project

Project/Area Number 26790081
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Computational science
Research InstitutionTokyo University of Science

Principal Investigator

Takahashi Akiyuki  東京理科大学, 理工学部, 准教授 (00366444)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords転位 / 離散転位動力学 / マルチスケール / 多結晶 / 弾性異方性 / 離散転位塑性 / 多結晶金属 / 並列計算 / 応力ーひずみ関係 / 均質化 / 重ね合わせの原理
Outline of Final Research Achievements

A multiscale polycrystal dislocation plasticity model was developed by applying the superposition principle and homogenization theory to 3D dislocation dynamics. The model was then implemented into a parallel computer environment using a hybrid parallelization model. The stress field in a bi-crystal with a dislocation loop was calculated. The numerical result agrees well with the analytical solution.
Plastic deformation of a copper polycrystal was simulated. The flow stress calculated with the elastic anisotropy becomes higher than that calculated with the elastic isotropy. In order to reveal the mechanism, the force acting on dislocations was calculated. It could be found that, the stress arisen from the externally applied deformation (strain) in elastically anisotropic single crystals is larger than that in elastically isotropic single crystals. In polycrystals, dislocation sources with low Schmid factors are activated by the stress concentration at crystal grain boundaries.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (10 results)

All 2015 2014

All Journal Article (2 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] 多結晶金属の塑性変形における弾性異方性の影響の基礎的検討2015

    • Author(s)
      鈴木祐哉,高橋昭如
    • Journal Title

      第20回計算工学講演会講演論文集

      Volume: 20

    • NAID

      40020497291

    • Related Report
      2015 Annual Research Report
  • [Journal Article] FCC金属中のすべり面間相互作用の3次元転位動力学モデリング2015

    • Author(s)
      河手遥,高橋昭如
    • Journal Title

      日本機械学会第28回計算力学講演会講演論文集

      Volume: 28

    • Related Report
      2015 Annual Research Report
  • [Presentation] Influence of Elastic Anisotropy on Flow Stress of Polycrystalline Metals: A Dislocation Dynamics Study2015

    • Author(s)
      Y. Suzuki, A. Takahashi
    • Organizer
      KSME-JSME Joint Symposium on Computational Mehcanics & CAE 2016
    • Place of Presentation
      早稲田大学
    • Year and Date
      2015-10-26
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] FCC金属中のすべり面間相互作用の3次元転位動力学モデリング2015

    • Author(s)
      河手遥,高橋昭如
    • Organizer
      日本機械学会第28回計算力学講演会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      2015-10-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] Dislocation Dynamics Modeling of Slip System Interactions in FCC Metals2015

    • Author(s)
      H. Kawate, A. Takahashi
    • Organizer
      13th U.S. National Congress on Computational Mechanics
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2015-07-26
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 離散転位動力学シミュレーションの基礎と非均質体への応用2015

    • Author(s)
      高橋昭如
    • Organizer
      第122回金属物性研究会「金属材料に含まれる転位組織と運動解析の最前線」
    • Place of Presentation
      島根大学
    • Year and Date
      2015-06-27
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] 多結晶金属の塑性変形における弾性異方性の影響の基礎的検討2015

    • Author(s)
      鈴木祐哉,高橋昭如
    • Organizer
      第20回計算工学講演会
    • Place of Presentation
      つくば国際会議場
    • Year and Date
      2015-06-08
    • Related Report
      2015 Annual Research Report
  • [Presentation] Dislocation Dynamics Study on Influence of Elastic Anisotropy in Polycrystal Plastic Deformation2015

    • Author(s)
      Y. Suzuki, A. Takahashi
    • Organizer
      Mechanical Engineering Seminar 2015
    • Place of Presentation
      諏訪東京理科大学
    • Year and Date
      2015-03-25
    • Related Report
      2014 Research-status Report
  • [Presentation] Role of elastic anisotropy in plastic deformation of polycrystalline metals: A dislocation dynamics study2014

    • Author(s)
      A Takahashi
    • Organizer
      11th World Congress on Computational Mechanics
    • Place of Presentation
      Barcelona, Spain
    • Year and Date
      2014-07-24
    • Related Report
      2014 Research-status Report
  • [Presentation] FCC金属中のすべり面相互作用の3次元転位動力学解析2014

    • Author(s)
      河手遥,高橋昭如
    • Organizer
      第19回計算工学講演会
    • Place of Presentation
      広島国際会議場
    • Year and Date
      2014-06-11
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2017-05-10  

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