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Analytical Studies on Ductile Fracture Behavior Near the Crack-Tip

Research Project

Project/Area Number 62302025
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionTokyo Institute of Technology

Principal Investigator

SAKATA Masaru  Tokyo Institute of Technology, 工学部, 教授 (90016296)

Co-Investigator(Kenkyū-buntansha) ABE Hiroyuki  Tohoku University, 工学部, 教授 (00005266)
OTSUKA Akio  Nagoya University, 工学部, 教授 (60022993)
KITAGAWA Hiroshi  Osaka University, 工学部, 教授 (30029095)
MIYAMOTO Hiroshi  Science University of Tokyo, 理工学部, 教授 (70010593)
AOKI Shigeru  Tokyo Institute of Technology, 工学部, 教授 (90016436)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥8,800,000 (Direct Cost: ¥8,800,000)
Fiscal Year 1988: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1987: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsDuctile Fracture / Finite Element Method / Large Deformation Analysis / Slip line Theory / Process Zone / Intense Strain Region / Gurson's Yield Function / Void Volume Fraction / Crystal Model / Mixed Mode / 混合モード / 局所化 / J積分 / 楔形き裂開口 / ボイド率、混合モード / き裂 / 塑性変形 / 混合モード破壊 / 破壊進行域 / 空孔率 / 有限要素法
Research Abstract

It is the purpose of the present research program to investigate analytically the deformation and fracture behavior at the crack-tip of tough-materials, to make a comparison with the experimental results, and to propose a criterion for ductile fancture at the crack-tip. Large deformation finite element analyses are performed to study deformation and microvoid concentration properties near a notch or a crack-tip under opening or mixed mode loadings with Gurson's constitutive equation used for simulating nucleation and growth of micrvoids. A macrovoid is also assumed to be located near the crack-tip in order to examine its effect on deformation and fracture behavior of crack-tip. It is shown that under mixed mode loadings one corner of a crack-tip sharpens while the other corner blunts, and the strain and void volume fraction become concentrated at the sharpened corner with the increase of mode II component. A macrovoid near the blunted corner grows rapidly and a strong interaction is evidenced with microvoid fraction concentrated at the location between the macrovoid and blunted crack corner whereas a macrovoid near the sharpened cormer is found to have little effect on crack-tip deformation and fracture properties. A generalized crack-tip opening displacement and other quantities are proposed as parameters that control onset and growth of a crack under mixed mode loadings and are compared with the experimental results. Among these parameters, the critical void fraction, the condition of shear localization, the plastic work at the crack-tip, and the generalized crack-tip opening displacement are thought to be candidates for ductile fracture criterion. Further investigations will be required bofore a definite conclusion can be drawn.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report

Research Products

(60 results)

All Other

All Publications

  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1988 Final Research Report Summary
  • [Publications]

    • Related Report
      1988 Annual Research Report
  • [Publications]

    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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    • Related Report
      1988 Annual Research Report
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      1987 Annual Research Report
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      1987 Annual Research Report
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      1987 Annual Research Report
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    • Related Report
      1987 Annual Research Report
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    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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