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MECHANICAL MODELING OF INHOMOGENEOUS MEDIA AND APPLICATION TO EVALUATION OF HEAT AFFECTED ZONE IN WELD JOINT STRUCTURE

Research Project

Project/Area Number 11650089
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

IMATANI Shoji  Kyoto University, Department of Energy Conversion Science, Associate Professor, エネルギー科学研究科, 助教授 (70191898)

Co-Investigator(Kenkyū-buntansha) UEHARA Takuya  Kyoto University, Department of Energy Conversion Science, Research Associate, エネルギー科学研究科, 助手 (50311741)
HOSHIDE Toshihiko  Kyoto University, Department of Energy Conversion Science, Associate Professor, エネルギー科学研究科, 助教授 (80135623)
INOUE Tatsuo  Kyoto University, Department of Energy Conversion Science, Professor, エネルギー科学研究科, 教授 (10025950)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsInhomogeneity / Heat Affected Zone / Crystal Plasticity / Finite Element Method / Microscopic Deformation / Material Anisotropy / 有限変形理論 / 成形限界
Research Abstract

In order to establish the analytical methodology to evaluate the mechanical behavior of inhomogeneous materials, microscopic deformation is investigated on a heat affected zone (HAZ) of weld joint material. The following results are obtained.
1. Hradeness of heat affected zone In the heat affected zone of Mod.9Cr-1Mo steel, we observe fine grain region and coarse grain region. It is found that the hardness of fine grain region is lower than the other, which is completely opposite to the well-known Hall-Petch effect. This is caused by the complicated temperature history in the course of generation of HAZ.It is still necessary to measure the deformation in more microscopic level of several grain size order.
2. Model analysis of polycrystalline material Introducing a crystal plasticity model by Asaro and Needleman into three-dimensional finite element method, a polycrystal model is proposed. As a result of analysis, it is shown that more variety in strain is predicted in larger grain size region. Such a tendency shows qualitative agreement with experiment.
3. Evaluation of grain sliding By use of a joint element technique across the brick elements, sliding in grain boundary is predicted. And the sliding in grain boundary accelerates the variety in strain. This technique is applicable to the deformation analysis at high temperature, in which the slide causes small crack opening.
4. Modeling of self-adaptation in terms of anisotropy A constitutive model taking account of the variation of anisotropy is proposed. The anisotropy changes its direction due to the surrounding circumstances. It is shown that the model is applicable not only to the fiber-reinforced materials but also to other materials such as biological tissues, in which self-organization takes place while changing inhomogeneity by themselves.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 前田亮平: "溶接熱影響部の微視的変形と結晶塑性解析による検討"日本材料学会第50期学術講演会論文集. (発表予定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shoji IMATANI: "A Constitutive Model of Adaptation and Anisotropy for Growing Material"Material Science Research International : Special Technical Publication-2. (印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shoji IMATANI: "Finite Element Analysis of Growing Processes Based on a Self-adaptation Model"Proceedings of The fifth International Seminar on Microstructures and Mechanical Properties of New Engineering Materials. (発表予定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ryohei MAEDA: "Microscopic Deformation of Heat Affected Zone in Weld Joint and Crystal Plasticity Analysis (in Japanese)"Proceedings of 50-th Annual Meeting of The Society of materials Science Japan. (to appear). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shoji IMATANI: "A Constitutive Model of Adaptation and Anisotropy for Growing Material"Material Science Research International : Special Technical Publication-2. (in print). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shoji IMATANI: "Finite Element Analysis of Growing Processes Based on a Self-adaptation Model"Proceedings of The fifth International Seminar on Microstructures and Mechanical Properties of New Engineering Materials. (to appear). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 前田亮平: "溶接熱影響部の微視的変形と結晶塑性解析による検討"日本材料学会第50期学術講演会論文集. (発表予定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Shoji IMATANI: "A Constitutive Model of Adaptation and Anisotropy for Growing Material"Material Science Research International : Special Technical Publication-2. (発表予定). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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