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Development of discrete dislocation plasticity analysis of BCC metals based on multiscale materials modeling

Research Project

Project/Area Number 16K05044
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Computational science
Research InstitutionTokyo University of Science

Principal Investigator

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

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords転位動力学 / 分子動力学 / 転位 / モビリティ / スピノーダル分解 / 温度依存性 / BCC金属 / 臨界分解せん断応力 / マルチスケール / 混合転位 / 易動度 / キンク対 / 分子動力学法 / 転位芯 / 転位動力学法 / BCC / マルチスケール材料モデリング / 金属 / 離散転位塑性
Outline of Final Research Achievements

The crystal orientation and temperature dependence of dislocation velocity in BCC iron is investigated using an atomistic simulation method. The results illustrate the atomic dislocation core structure and its relationship with the dislocation velocity. The relationship is modeled to implement the information about the crystal orientation and temperature dependence of dislocation velocity into a dislocation dynamics simulation code. As a benchmark test of the developed method, a crystal model with a straight dislocation is prepared, and is subjected to a shear deformation. The resultant shear stress-strain relationship tells us that the method has a capability to account for the temperature dependence, which can be seen in BCC iron. The developed method is then applied to the numerical simulation of dislocation behavior in a spinodally decomposed Fe-Cr alloys. By the application, the relationship between the microstructure of the Fe-Cr alloy and the critical resolved shear stress.

Academic Significance and Societal Importance of the Research Achievements

本研究によって,金属中の格子欠陥である転位の特徴を分子動力学法による計算結果からモデル化し,そのモデルを直接転位動力学法に入力することによって,現実的な塑性変形解析が実現可能になることを示すことができた.具体的には,本研究の成果によって,BCC鉄の変形に見られる温度依存性を考慮することが可能になり,転位動力学法を用いたBCC鉄の塑性変形解析の信頼性を著しく向上させることに成功した.この成果により,今後析出物などの微視的組織と転位の相互作用に基づく材料の強化・劣化のより現実的なシミュレーションが可能となり,材料の信頼性評価や設計に対し大きく貢献することができる.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (17 results)

All 2018 2017 2016

All Journal Article (3 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results,  Acknowledgement Compliant: 1 results) Presentation (14 results) (of which Int'l Joint Research: 11 results,  Invited: 3 results)

  • [Journal Article] Influence of spinodal decomposition structures on the strength of Fe-Cr alloys: A dislocation dynamics study2018

    • Author(s)
      Takahashi A.、Suzuki T.、Nomoto A.、Kumagai T.
    • Journal Title

      Acta Materialia

      Volume: 146 Pages: 160-170

    • DOI

      10.1016/j.actamat.2017.12.051

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Atomistic-continuum hybrid analysis of dislocation behavior in spinodally decomposed Fe-Cr alloys2017

    • Author(s)
      A. Takahashi, M. Kanazawa
    • Journal Title

      MATEC Web of Science

      Volume: 印刷中

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] 分子動力学法を用いたBCC鉄中の混合転位の挙動解析2016

    • Author(s)
      高橋一貴,高橋昭如,野本明義
    • Journal Title

      第21回計算工学講演会講演論文集

      Volume: 21

    • NAID

      40020853717

    • Related Report
      2016 Research-status Report
  • [Presentation] Development of a Temperature-dependent Dislocation Dynamics Model for Plasticity in BCC Iron2018

    • Author(s)
      A. Suzuki, A. Takahashi
    • Organizer
      The 11th International Conference on Fracture and Strength of Solids
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of anisotropic dislocation mobility on mechanical strength in spinodally decomposed Fe-Cr alloys2018

    • Author(s)
      T. Furuya, A. Takahashi
    • Organizer
      International Workshop on Computational Science and Engineering Applications
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スピノーダル分解したFe-Cr合金における転位挙動の異方性が機械的強度に与える影響2018

    • Author(s)
      古谷拓万,高橋昭如
    • Organizer
      日本機械学会第31回計算力学講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Influence of Spinodal Decomposition on Dislocation Behaviors in Fe-Cr Alloys2017

    • Author(s)
      A. Takahashi, T. Suzuki, A. Nomoto
    • Organizer
      The 2nd International Conference on Computational Engineering and Science for Safety and Environmental Problems
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Multiscale Modeling of Dislocation Kinetics in BCC Iron2017

    • Author(s)
      A. Takahashi, K. Takahashi
    • Organizer
      14th U. S. National Congress on Computational Mechanics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Multiscale Modeling of Dislocation Kinematics in BCC Iron2017

    • Author(s)
      A. Takahashi, K. Takahashi
    • Organizer
      JSME-KSME Joint Symposium on Computational Mechanics & CAE 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Multiscale modeling of dislocation behavior in BCC metals2017

    • Author(s)
      A. Takahashi, K. Takahashi
    • Organizer
      4th Japanese-German Workshop on Computational Mechanics
    • Place of Presentation
      東北大学(宮城県・仙台)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Dislocation Dynamics Modeling of Material Strength Change in Spinodally Decomposed Ferritic Fe-Cr Alloys2016

    • Author(s)
      T. Suzuki, A. Takahashi, A. Nomoto
    • Organizer
      Dislocations 2016
    • Place of Presentation
      パデュー大学(アメリカ)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Temperature Dependence of Mixed Dislocation Mobility in BCC Iron2016

    • Author(s)
      K. Takahashi, A. Takahashi, A. Nomoto
    • Organizer
      The 10th International Conference on Fracture & Strength of Solids
    • Place of Presentation
      東京理科大学葛飾キャンパス(東京都・葛飾区)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Thermally Activation Process and Energy of Mixed Dislocations in alpha-Fe2016

    • Author(s)
      K. Yang, K. Takahashi, A. Takahashi
    • Organizer
      The 10th International Conference on Fracture & Strength of Solids
    • Place of Presentation
      東京理科大学葛飾キャンパス(東京都・葛飾区)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Evaluation of the Influence of Spinodal Decomposition on Material Strength in Fe-Cr Binary Alloys2016

    • Author(s)
      T. Suzuki, A. Takahashi, A. Nomoto
    • Organizer
      The 10th International Conference on Fracture & Strength of Solids
    • Place of Presentation
      東京理科大学葛飾キャンパス(東京都・葛飾区)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular Dynamics Modeling of Mixed Dislocation Kinetics in BCC Iron2016

    • Author(s)
      K. Takahashi, A. Takahashi, A. Nomoto
    • Organizer
      The 12th World Congress on Computational Mechanics
    • Place of Presentation
      ソウル(韓国)
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 転位の原子スケールモデリングによるマルチスケール塑性変形解析の高精度化に向けて2016

    • Author(s)
      高橋昭如
    • Organizer
      第3回SIPコロキウム「マルチスケール力学の現状と課題」
    • Place of Presentation
      東京大学駒場リサーチキャンパス(東京都・目黒区)
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] 分子動力学法を用いた金属中の転位挙動モデリング2016

    • Author(s)
      高橋昭如
    • Organizer
      日本複合材料学会分子シミュレーション研究会第9回総会講演会
    • Place of Presentation
      東京理科大学葛飾キャンパス(東京都・葛飾区)
    • Related Report
      2016 Research-status Report
    • Invited

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Published: 2016-04-21   Modified: 2020-03-30  

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