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Fundamental Investigation on Crack Behavior in Particulate-Dispersed Functionally Graded Material

Research Project

Project/Area Number 06650100
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Materials/Mechanics of materials
Research InstitutionShizuoka University

Principal Investigator

TOHGO Keiichiro  Shizuoka University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10155492)

Co-Investigator(Kenkyū-buntansha) ARAKI Hiroyasu  Shizuoka University, Faculty of Engineering, Research Associate, 工学部, 助手 (60115433)
ISHII Hitoshi  Shizuoka University, Faculty of Engineering, Professor, 工学部, 教授 (90022235)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsFunctionally Graded Material / Fracture Mechanics / Crack Behavior / Particulate Reinforced Composite / Finite Element Method / Crack Tip Singular Field / Fracture Toughness / Glass Particle Reinforced Nylon 66 / 破壊靱性
Research Abstract

In this project, in order to make clear the crack behavior in a functionally graded material (FGM), analytical work on influence of gradient on the fracture mechanics parameters and crack tip singular field, and experimental work on the mechanical properties and fracture toughness in composites and FGMs were carried out. Obtained results are summarized as follows.
1. Elastic and elastic-plastic analyzes of a crack in a particulate-dispersed FGM were carried out using a newly developed finite element method based on Tohgo-Chou-Weng's constitutive relation. The following conclusions are derived : (1) The stress intensity factors of a crack in FGM is affected by the gradient of mechanical properties. (2) The elastic and plastic stress singular fields around a crack-tip in FGM are basically described by the fracture mechanics parameters (K and J) as well as in non-FGM,using the mechanical properties of the material at the crack-tip. (3) The size of singular field decreases with an increase in the gradient of the mechanical properties. This suggests that the applicability of fracture mechanics such as small scale yielding condition and validity of J-integral is affected by the gradient.
2. Tensile tests and fracture toughness tests were carried out on seven kinds of glass particle reinforced nylon 66 composites. The stress-strain response, mechanical properties and fracture toughness of the composites depend on the particle volume fraction and the treatment of interface between the particles and matrix.
3. FGMs were made by joining four kinds of glass particle reinforced nylon 66 composites by hot press, and three point bending tests and fracture toughness tests were carried out on the FGMs. It was suggested that the strength of the FGM should be evaluated based on the analytical results taking account of the gradient and the fracture process in FGM can be different from that in non-FGM.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 東郷敬一郎: "粒子分散型傾斜機能材料におけるき裂の弾塑性解析" 日本機械学会講演論文集(No.940-30). I. 119-121 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 東郷敬一郎: "粒子分散型傾斜機能材料におけるき裂先端特異場の解析" 日本機械学会講演論文集(No.940-54). 27-28 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Analysis of Crack-Tip Singular Field in Particulate-Dispersed Functionally Graded Material" Plasticity '95. 743-746 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 東郷敬一郎: "傾斜機能材料の強度評価における破壊力学の適用性に関する研究" 日本機械学会論文集A編. 61. 2543-2551 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 東郷敬一郎: "ガラス粒子分散強化ナイロン66の引張強度特性に及ぼす粒子体積率および界面処理の影響" 日本機械学会講演論文集(No.95-2). B. 159-160 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 東郷敬一郎: "ガラス粒子分散ナイロン66複合材料の変形・強度特性と損傷モデル" 日本材料学会第8回破壊力学シンポジウム. 200-204 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Elastic-Plastic analysis of a crack in Particulate-Dispersed Functionally Graded Material" Proceedings of JSME Meeting. No.940-30. 119-121 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Analysis of a Crack-Tip Singular Field in Particulate-Dispersed Functionally Graded Material" Proceedings of JSME Meeting. No.940-54. 27-28 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Analysis of Crack-Tip Singular Field in Particulate-Dispersed Functionally Graded Material" Proceedings of Plasticity '95. 743-746 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Applicability of Fracture Mechanics in Strength Evaluation of Functionally Graded Materials" Trans.of Japan Society of Mechanical Engineers, Ser.A. Vol.61, No.592. 2543-2551 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Influence of Particle Volume Fraction and Surface Treatment on Tensile Properties of Glass Particle Reinforced Nylon 66 Composites" Proceedings of JSME Meeting. No.95-2, Vol.B. 159-160 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Mechanical Properties and Damage Model of Glass Particle Reinforced Nylon 66 Composites" Proceedings of 8th Symposium on Fracture and Fracture Mechanics, The Society of Materials Science. 200-204 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Keiichiro Tohgo: "Analysis of Crack-Tip Singular Field in Particulate-Dispersed Functionally Graded Material" Plasticity'95. 743-746 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 東郷敬一郎: "傾斜機能材料の強度評価における破壊力学の適用性に関する研究" 日本機械学会論文集,A編. 61. 2543-2551 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 東郷敬一郎: "ガラス粒子分散強度ナイロン66の引張強度特性に及ぼす粒子体積率および界面処理の影響" 日本機械学会講演論文集(No.95-2). B. 159-160 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 東郷敬一郎: "ガラス粒子分散ナイロン66複合材料の変形・強度特性と損傷モデル" 日本材料学会第8回破壊力学シンポジウム. 200-204 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Keiichiro Tohgo: "Application of Incremental Damage Theory to Glass Particle Reinforced Nylon66 Composites" Localised Damage 96. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 東郷敬一郎: "粒子分散型傾斜機能材料におけるき裂の弾塑性解析" 日本機械学会講演論文集(No.940-30). 1. 119-121 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 東郷敬一郎: "粒子分散型傾斜機能材料におけるき裂先端特異場の解析" 日本機械学会講演論文集(No.940-54). 27-28 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 東郷敬一郎: "傾斜機能材料におけるき裂挙動の評価" 日本機械学会関西支部第70期講演会. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Keiichiro Tohgo: "Analysis of Crack・Tip Singular Field in Particulate-Dispersed Funcfionally Graded Material" Plasticity'95. (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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