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1990 Fiscal Year Final Research Report Summary

A Study on the Applicability of Dynamic Linear Fracture Mechanics and Its Extension

Research Project

Project/Area Number 01460094
Research Category

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

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

Principal Investigator

AOKI Shigeru  Tokyo Institute Engineering Professor of Technology, 工学部, 教授 (90016436)

Co-Investigator(Kenkyū-buntansha) KISHIMOTO Kikuo  Tokyo Institute Engineering Associate Professor of Technology, 工学部, 助教授 (30111652)
Project Period (FY) 1989 – 1990
KeywordsImpact Fracture Toughness / Linear Dynamic Fracture Mechanics / One-Point Bend-Impact Tester / Simple Formula / Ceramics / Ceramic-Reinforced Metal / Finite Element Simulation / Caustics Method
Research Abstract

The researches on the mechanics of dynamic fracture have been reviewed and it has been pointed out that there are many reports on peculiar behaviors of impact fracture toughness K_<Id> and fast crack propagating toughness K_<ID>, and that these peculiar behaviors prevent the development of the linear dynamic fracture mechanics. The importance of developing a reliable method for measuring the dynamic fracture toughnesses K_<Id> and K_<ID> and the necessity for clarifying the extent of applicability of the liner dynamic fracture mechanics have been also pointed out.
In this research, firstly the accuracy of the finite element calculation of the dynamic stress intensity factor K (t) has been studied and a simple formula for determining K (t) of an impacted one-point bend specimen has been proposed based on the Euler-Bernoulli beam theory. By using the one-point-bend impact tester and the above simple formula, an impact fracture toughness K_<Id> test has been carried out on silicon carbide, … More sialon, PSZ, alumina and alumina-zirconia composite at temperatures up to 1200^。C. The existence of the contact force acting on the crack surfaces has been confirmed and its effect on the measured K_<Id> value has been discussed in relation to test conditions such as loading rate, specimen size and time-to-fracture.
The impact fracture toughness K_<Id> of alumina-powder/aluminum composite and alumina-fiber/aluminum composite has also been measured at temperatures up to 200^。C by using a one-point bend impact tester. Young's modulus, Poisson's ratio and yield stress were measured at testing temperatures, and the dynamic stress intensity factor has been calculated by applying the plastic zone correction. The experimental results has been qualitatively explained by taking the creep deformation of the matrix into consideration.
A finite element simulation of measuring K_<Id> by the caustics method in the range of short time-to-fracture has been performed. It has been found that there exists a delay time to detect crack initiation because of the slowness of the development of the stress high enough to have a significant effect on caustics. Some of the peculiar experimental data of K_<Id> have been explained by taking the delay time of detection of crack extension by the caustics method into consideration. Less

  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] K.KISHIMOTO: "Study on the Accuracy J^^<^>ーintegral Caluculation by Finite Element Method" Proc. Pressure Vessel and Piping(ASME)ー160. 111-116 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.SAKATA: "Measrement of Dynamic FRacture Toughness of Ceramic Materials at Elevated Temperature by OneーPointーBend Impact Test" Proc.7th Int.Conf.on Fractre. 1. 827-836 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.AOKI: "Impact fractre Toughness of Ceramic Materials at Elevated Temperature Dynamic Fracture" Proc.Oji International Seminar on Dynamic Fracture(edited by H.Homma and Y.Kanto). 114-124 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.KISHIMOTO: "OneーPointーImpact Testing of Ceramic Material" Proc.of KSME/JSME Joint ConFerence on Fracture and Strength '90. 654-659 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.KISHIMOTO: "A Simple Formula for the Dynamic Stress Intensity Factor of an Impacted FreelyーSupported Bend Specimen" JSME Int.Journal,Series I. 33. 51-56 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青木 繁: "アルミナおよびアルミナージルコニア複合材料の高温衝撃破壊靭性試験" 材料. 39. 1644-1649 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.KISHIMOTO: "Computational Accuracy of the Jーintegral by the FiniteーElement Method" Int.J.Pres.Ves.and Piping. 44. 255-266 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青木 繁: "コ-スティックス法による衝撃破壊靭性の測定に関する有限要素解析" 日本機械学会論文集. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高橋 伸一郎: "セラミック強化金属の高温衝撃破壊靭性" 日本機械学会論文集. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.AOKI: "FEーInvestigation on Caustics for Measuring Impact Fracture Toughness" Proc.of Int.Seminar on Dynamic Fracture. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.AOKI: "Numerical Study on Shadow Spot Method for Measuring Dynamic Fracture Toughness" Proc.of Int.Conference on Mechanical Behaviors of Material(ICMー6). (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.TAKAHASHI: "Impact Fracture Toughness on ceramic Reiforced Metals at Elevated Temperature" Proc.of Int.Seminar on Dynamic Fracture. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.SAKATA: "Fracture Mechanics(Current Japanese Materials Research Vol.8 Chapter 4" Elsevier, (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shigeru AOKI: "Impact Fracture Toughness of Ceramic Materials at Elevated Temperature Dynamic Fracture" Proc. Oji International Seminar on Dynamic Fracture (edited by H. Homma and Y. Kanto),. 114-124 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kikuo KISHIMOTO: "Study on the Accuracy of -integral Calculation by Finite Element Method" Proc. Pressure Vessel and Piping (ASME)-160,. 111-116 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masaru SAKATE: "Measurement of Dynamic Fracture Toughness of Ceramic Materials at Elevated Temperature by One-Point-Bend Impact Test" Proc. 7th Int. Conf. on Fracture (Advance in Fracture Research),. Vol. 1,. 827-836 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kikuo KISHIMOTO: "One-Point-Impact Testing of Ceramic Material" Proc. of KSME/JSME Joint Conference on Fracture and Strength '90. 654-659 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kikuo KISKHIMOTO: "A Simple Formula for the Dynamic Stress Intensity Factor of an Impacted Freely-Supported Bend Specimen" JSME Int. Journal, Series I,. Vol. 33, No. 1,. 51-56 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shigeru AOKI: "High Temperature Impact Fracture Toughness Testing of Alumina and Alumina-Zirconia Composite" J. Soc. Mat. Sci. Japan (in Japanese). Vol. 39, NO. 447. 1644-1649 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kikuo KISHIMOTO: "Computational Accuracy of the J-integral by the Finite-Element Method" Int. J. Pres. Ves. and Piping,. Vol. 44. 255-266 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shigeru AOKI: "Finite Element Investigation on Caustics for Measuring Impact Fracture toughness" Trans. JSME Ser. A (in Japanese).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shinichirou TAKAHASHI: "Impact Fracture Toughness of Ceramic-Reinforced Metals at Elevated Temperatures" Trans. JSME Ser. A (in Japanese).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shigeru AOKI: "On the requirement for applying dynamic linear fracture mechanics" Japan NCTAM Preprint (in Japanese). 51-54 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shigeru AOKI: "FE-Investigation on Caustics for Measuring Impact Fracture Toughness" Proc. of Int. Seminar on Dynamic Fracture,.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shinichirou TAKAHASHI: "Impact Fracture Toughness on Ceramic Reinforced Metals at Elevated Temperature" Proc. of Int. Seminar on Dynamic Fracture,.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shigeru AOKI: "Numerical Study on Shadow Spot Method for Measuring Dynamic Fracture Toughness" Proc. of Int. Conference on Mechanical Behaviors of Material (ICM-6).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masaru SAKATE: "Chapter 4 Measurement of the Impact Fracture toughness of Ceramic at Elevated Temperatures" Fracture Mechanics (Current Japanese Materials Research Vol. 8),. 65-82

    • 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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