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Research on Dynamic Fracture Toughness for High Toughness Material ----Measuring Method and Property------

Research Project

Project/Area Number 60550062
Research Category

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

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

Principal Investigator

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

Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1986: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1985: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsDynamic fracture toughness / Impact 3-point bend specimen / High toughness material / Simple method for estimating J-integral / Fracture under large scale yield condition / Detecting fracture initiation / 高速き裂
Research Abstract

Although many attempts have been made to determine the accurate value of dynamic fracture toughness, no standard method such as KIC or JIC test method has been found and there are many uncertain properties about dynamic fracture toughness.
In this reseach, a simple system of measuring dynamic fracture toughness was developed using a drop weight striker and 3-point bend specimens. In the system, the impact force is determined by analyzing the output of the strain gage near the tip of the striker using the Fast Fourie Transformer, and the dynamic stress intensity factor is calculated by a simple formula proposed previously.
A dynamic fracture toughness test was conducted on an aluminum alloy 2124-T6, a fiber reinforced metal SiC 25%/2124-T6 and a nuclear pressure vessel steel A508S. The dynamic fracture toughness for the two formers which were relatively brittle was easily determined using the developed measuring system, while for the latter which was rather ductile it was found neccessary to introduce a simple method for estimating the dynamic elastic-plastic fracture toughness parameter J-integral.
By applying the idea of plastic region correction, a simple method was developed for estimating the J-integral. It was found that the value of J-integral obtained by the simple method agreed well with the one by the finite element method (FEM) and the CPU time of the simple method was about 1/100 times shorter than that of the FEM.
A finite element technique to calculate the stress intensity factor for a fast crack was developed using a commonly used triangular constant strain element and the J-integral. This technique may be conveniently used to measure the dynamic fracture toughness for a rapidly propagating crack.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 岸本喜久雄・ほか: 材料. 35-395. 850-853 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 青木繁・ほか: 材料. 36-402. 274-279 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 岸本喜久雄・ほか: 日本機械学会第64期全国大会講演会・講演概要集. 860-7. 32-33 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 青木繁・ほか: 日本機械学会第64期全国大会講演会・講演概要集. 860-7. 30-31 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 青木繁・ほか: 日本材料学会第2回材料の衝撃問題・シンポジウム前刷集. 113-116 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 岸本喜久雄・ほか: 日本機械学会論文集. 52A-474. 440-448 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Aoki;et al.,: Proc.Int.Conf.on Fracture and Fracture Mechanico. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] S.Aoki;et al.,: Proc.Int.Conf.on Computational Mechanics. 4V-279-28 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kikuo Kishimoto, et al.: "A measuring system for dynamic stress intensity factors using a FFT analyzer -----Application to drop weight impact 3-point bend testing------ (in Japanese)" Journal of the society of materials science, Japan. 35-395. 850-853 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Aoki, et al.: "Measurement of Impact Fracture Toughness on Aluminum Alloy and Steel (in Japanese)" Journal of the society of materials science, Japan. 36-402. 274-279 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kikuo Kishimoto, et al.: "A simple method for estimating the J-integral of Impacted 3-point bend specimen (in Japanese)" Preprint of the Japan Society of Mechanical Engineers Meeting. 860-7. 32-33 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Aoki,et al.: "Measurement of Dynamic Fracture Toughness KId on 2124, SiC25%/2124 and A508S (in Japanese)" Preprint of the Japan Society of Mechnical Engineers Meeting. 860-7. 30-31 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Aoki,et al.: "Measurement of Impact Fracture Toughness on AluminumAlloy and Steel (in Japanese)" Proceedings of the 2nd SMSJ Symposium on the Impact Problem of Materials. 113-116 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Aoki, et al.: "Measurement of Dynamic Fracture Toughness on Aluminum and Steel" Proceeding of the International Conference on Fracture and Fracture Mechanics.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Shigeru Aoki, et al.: "Finite Element Analysis of Dynamic Stress Intensity Factor of Rapidly Propagating Crack Usig J-integral" Proceedig of the International Conference on Computational Mechanics. V279-V284 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kikuo Kishimoto, et al.: "Finite Element Analysis of Dynamic Stress Intensity Factor of Rapidly Propagating Crack Using J-integral (in Japanese)" Transactions of the Japan Society of Mechnical Engineers. 52A-474. 440-448 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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