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1993 Fiscal Year Final Research Report Summary

Evaluation of the Local Fracture Toughness of Toughened Ceramic Composites Based on In-situ Observation of Microscoic Crack Extension

Research Project

Project/Area Number 04650694
Research Category

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

Allocation TypeSingle-year Grants
Research Field 無機工業化学・無機材料工学
Research InstitutionTokyo Institute of Technology

Principal Investigator

YASUDA Kouichi  Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (20191306)

Co-Investigator(Kenkyū-buntansha) TANABE Yasuhiro  Tokyo Institute of Technology, Research Laboratory of Engineering Materials, Ass, 工業材料研究所, 助教授 (70163607)
Project Period (FY) 1992 – 1993
KeywordsCeramic Composites / Crack Extension / Fracture Toughness / In-situ Observation
Research Abstract

The influence of elastic msmatch or thermal expansion mismatch between dispersed particle and matrix on fracture toughness of toughened ceramic composites was formulated by the equivalent inclusion method.
This theory was verified with experimental results of particle-dispersed polycrystalline mullite. Microscopic crack extension in polycrystalline alumina was in-situ observed with secondary electron microscope equipped with bending test fixture. It indicated that the microscopic crack extenson was explained with markov process. Byconsidering the relation-ship between fracture toughness and fraction of transgranular fracture, the local fracture toughnesses ( fracture toughness for transgranular fracture and that for intergranular fracture ) of particle-dispersed polycrystalline magnesia were quantitatively evaluated.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 安田 公一: "等価介在物法による破壊靭性に及ぼす弾性不均一性及び残留熱応力効果の解析" Journal of the Ceramic Society of Japan. 100. 1332-1337 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 織田 裕久: "介在物の熱弾性特性がムライトの破壊靭性に及ぼす影響" 日本複合材料学会1993年度研究発表講演予稿集. 23-24 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 多々見 純一: "ガラスおよびアルミナ多結晶体のき裂進展挙動のその場観察" 日本セラミックス協会1993年会講演予稿集. 98-99 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kouichi YASUDA: "Influence of the crack path on the fracture toughness of polycrystalline MgO" The Third IUMRS International Conference on Advanced Materials. 6(印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安田 公一: "多結晶Al_2O_3の破壊靭性に及ぼすき裂進展経路の影響" Journal of the Ceramic Society of Japan. 101. 1384-1389 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 斎藤 徹: "高速粒子の衝突による黒鉛材料の損傷" 平成5年度衝撃波シンポジウム講演論文集. 393-396 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安田 公一: "複合系セラミックスの破壊靭性に及ぼす微細組織の影響" 東京工業大学 博士論文(工学)[自費出版], 246 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 多々見 純一: "多結晶Al_2O_3の破壊靭性に及ぼすき裂進展経路の影響" 東京工業大学 修士論文(工学)[自費出版], 133 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kouichi YASUDA: "Analysis of Effectsof Elastic Inhomogeneity and Residual Thermal Stress on Fracture Toughness by the Equivalent Inclusion Method, Journal of the Ceramic Society of Jaan" 101. 1332-1337 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirohisa ODA: "The Effect of Thermoelastic Properties of Inclusions on Fracture Toughness of Polycrystalline Mullite" Abstracts of 1993 Annual Meeting of the Japan Society for Composite Materials. 23-24 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junchi TATAMI: "In-situ Observation of the Crack Propagations in Glass and Polycrystalline Alumina" Abstracts of 1993 Annua Meeting of the Ceramic Society of Japan. 98-99 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kouichi YASUDA: "Influence of the Crack Path on the Fracture Toughness of Polycrystalline MgO" The Third IUMRS International Conference on Advanced Materials. 6 (in printing). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kouichi YASUDA: "Influence of Crck Propgation Path on the Fracture Toughness of Polycrystaline Al_2O_3" Journal of the Ceramic Society of Japan. 101. 1384-1389 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tohru SAITOH: "Dameges by a Particle Impat to Graphites at High Velocity, Abstracts of 1993 Annual Meeting on Shock Wave" 393-396 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kouichi YASUDA: "Influence of Microstructures on Fracture Toughness of Ceramic Composites" Doctoral dissertatio ( Tokyo Institute of Technology ). 246 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junichi TATAMI: "Influence of Crack Propergation Path on the Fracture Toughness of Polycrystalline Alumina" Master Thesis ( Tokyo Institute of Technology ). 133 (1994)

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

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Published: 1995-03-27  

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