• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1998 Fiscal Year Final Research Report Summary

Study on Macro-Meso Coupled Problems in Material Failure

Research Project

Project/Area Number 09651020
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 海洋工学
Research InstitutionThe University of Tokyo

Principal Investigator

TOI Yutaka  Institute of Industrial Science, Professor, 生産技術研究所, 教授 (40133087)

Co-Investigator(Kenkyū-buntansha) LEE Jeoung-Gwen  Institute of Industrial Science, Assistant, 生産技術研究所, 助手 (40302624)
Project Period (FY) 1997 – 1998
KeywordsMeterial failure / Macro-meso interaction / 3-d meso-analysis / Multi-phase materials / Discontinuum mechanics / Constitutive equation / Fracture toughness / Damage mechanics
Research Abstract

This study had the first purpose of formulation of a technique having to do with computational mechanics at a meso-scale which can handle inclusively the fracture behavior of the material which has structure. The three-dimensional meso-analysis algorithm for single-phase solids by using computational disctontinuun mechanics model has been extended to deal with multi-phase materials containing fibers or inclusions and to consider in-and inter-granular fracture and transformation plasticity. It was the second purpose to grasp the influence which their meso-scale structure/behavior exert on the macro property such as constitutive equations and fracture toughness and to evaluate and improve the macro-scale modeling such as the homogenization method and the damage mechanics, based on the results.
In 1997, first, we formulated the 3-dimensional meso-analysis algorithm considering in-and inter-granular fracture for single-phase solids (brittle polycrystalline solids) as an example of the mater … More ial which has structure. Next, we constructed the three-dimensional meso-analysis algorithm considering in-and inter-granular fracture and the transformation plasticity of the second-phase particles and so on for two-phase solids which contain microinclusions. Moreover, we made numerical simulations using these and considered about the validity of the computational technique.
In 1998, first, analyzing at a meso-scale about the macro elasticity constants computation when single-phase solids and two-phase solids are beforehand accompanied by the microcrack damage, we evaluated and improved theoretical solutions given by the existing homogenization method and so on. Next, analyzing at an meso-scale about the nonstationary damage development in single-phase solids and two-phase solids, we evaluated and improved the existing macro continuum damage mechanics model. Lastly, conducting meso-analysis about the R curve (the crack developing resistance curve) behavior of single-phase solids and two-phase solids, we considered about the relation between the meso-scale structure and macro fracture toughness. The head investigator mainly took charge of the formulation of meso-analysis algorithm of three-dimensions and the assisting investigator mainly took charge of programming and the numerical computation. We established a method of the approach having to do with computational mechanics about the macro-meso interaction problem in case of material fracture. We got some knowledge about the phenomenon of the damage and the fracture of the solid. Less

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 李 廷権、都井 裕: "変態塑性インクルージョンを含む二相固体の二次元メソ解析" 日本機械学会論文集A編. 64・620. 214-222 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 都井 裕、李 廷権: "インクルージョンを含む二相固体の二次元メソ解析" 日本機械学会論文集A編. 64・624. 34-40 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 都井 裕、李 廷権: "短繊維を含む二相材料の二次元メソ解析" 日本機械学会論文集A編. 64・625. 1-8 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yutaka Toi and Jeoung-Gwen Lee: "2-D Mesoscopic Simulation of Two-Phase Meterials Containing Short Fibers" Transactions of the Japan Society of Mechanical Engineers, Series A. Vol.64, No.625. 1-8 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yutaka Toi and Jeoung-Gwen Lee: "2-D Mesoscopic Simulation of Two-Phase Meterials Containing Microinclusions" Transactions of the Japan Society of Mechanical Engineers, Series A. Vol.64, No.624. 34-40 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jeoung-Gwen Lee and Yutaka Toi: "2-D Mesoscopic Simulation of Two-Phase Meterials Exhibiting Transformation Plasticity" Transactions of the Japan Society of Mechanical Engineers, Series A. Vol.64, No.620. 214-222 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1999-12-08  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi