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1990 Fiscal Year Final Research Report Summary

Study on the Failure Assessment Diagram of Ceramics

Research Project

Project/Area Number 01550068
Research Category

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

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionYokohama National University Faculty of Engineering

Principal Investigator

ANDO Kotoji  Yokohama National Univ. Faculty of Engineering Associate Professor., 工学部, 助教授 (40017992)

Co-Investigator(Kenkyū-buntansha) SAKAI Yuzuru  Yokohama National Univ. Faculty of Engineering Associate Professor., 工学部, 助手 (90114975)
OGURA Nobukazu  Yokohama National Univ. Faculty of Engineering Associate Professor., 工学部, 教授 (10017949)
Project Period (FY) 1989 – 1990
KeywordsCeramics / Probability / Failure Assessment Diagram / Process Zone / Short Crack / Fracture Toughness / Grain Size / Nonーlinear Fracture Mechanics
Research Abstract

Fracture behaviour of ceramics was examined in the range at a room temperature to 1200^゚C. Based on these results, a process zone size criterion for ceramics was proposed. In results, it was possible to assess the fracture characteristics of ceramics quantitatively, and gave following conclusions.
1)Using the same material, the statistical properties of fracture stress-sigma_F and fracture toughness K_<1C> was examined. In results, the dispersion characteristics of sigma_F and K_<1C> evidently conformed to the Weibull distribution. And the value of shape parameter alphafor K_<1C> is large than that for sigma_F.
2)In the range at a room temperature to 1200^゚C, fracture stress sihma_F tend to decreased with a gain of temperature. On the other hand, fracture toughness K_<1C> tend to increased.
3)It was impossible to evaluate the strength properties for ceramics with short crack by linear fracture mechanics. Fracture stress of ceramics show dependence on crack length. The proposed process zone size criterion can be accepted as a rational evaluation method for the fracture behaviour of ceramics. Furthermore, the past five other types of ceramics was examined. those data agreed fairly well process zone size criterion.
4)A evaluation method for notched material was also proposed based on process zone size criterion. It was possible to assess the dependence of fracture toughness for notch tip radius quantitatively on three other types of ceramics.
5)A failure assessment diagram for ceramics was proposed based on probabilistic concept and process zone size criterion. In this way, it was possible to assess the reliability for ceramics easily and conservatively.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 安藤 柱,他2名: "セラミックスの破壊評価線図に関する研究" 日本機械学会論文集. 55. 2138-2143 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kotoji ANDO,他2名: "Fracture and defect assessment of ceramic composites." Fatigue and Fracture of Engineering Materials and Structures. 13. 431-442 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安藤 桂,他3名: "窒化けい素(Si_3N_4)のじん性評価に関する研究" 圧力技術. 28. 218-228 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安藤 柱,他2名: "セラミックスのプロセスゾ-ン寸法破壊基準について." 日本機械学会論文集. 56. 2353-2358 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kotoji ANDO,他3名: "Process zone size failure criterion and plobabilistic fracture assessment curve for ceramics." Fatigue and Fracture of Engineering Materials and Structures.(191)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安藤 柱,他2名: "微小欠陥を有するアルミナの強度と信頼性評価に関する研究" 日本機械学会論文集.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kotoji ANDO and other two authors: "Study on the failure assessment diagram" Transaction of the Japan society of mechanical engineers. 55. 2138-2143 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kotoji ANDO and other two authors: "Fracture and defect assessment of ceramic composites" Fatigue and fracture of engineering materials and structure. 13. 431-442 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kotoji ANDO and other three authors: "Evaluation of fracture toughness of Si_3N_4" Pressure Engineering. 28. 218-228 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kotoji ANDO and other two authors: "Process zone size failure criterion for ceramics" Transactions of the Japan society of mechanical engineers. 56. 2353-2358 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kotoji ANDO and other three authors: "Process zone size failure criterion and Probabilistic fracture assessment curve for ceramics" Fatigue and fracture of engineering materials and structures.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kotoji ANDO and other two authors: "Strength and reliability of A1_2o_3 with short crack" Transaction of the Japan society of mechanical engineers.

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

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Published: 1993-08-12  

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