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Developemtn of Computer-aided X-ray Fractograby and It's Application to the Practical Fracture Analysis.

Research Project

Project/Area Number 61850170
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 機械材料工学
Research InstitutionOsaka University

Principal Investigator

KEIJI OGURA  Faculty of Engineering Science.Professor, 基礎工学部, 教授 (70029007)

Co-Investigator(Kenkyū-buntansha) 西川 出  大阪大学, 基礎工学部, 助手 (90189267)
三好 良夫  大阪大学, 基礎工学部, 助教授 (40029434)
YOSHIO MIYOSHI  Faculty of Engineering Science-Associate Professor
IZURU NISHIKAWA  Faculty of Engineering Science. Associate
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsFracture analysis / X-ray / Residual stress / Half-value width / Fatiguw fracture surface / Stress ratio / 遡性域深さ / 定量破面解析 / 表面層除去X線フラクトグラフィ
Research Abstract

Development of a compute-aided x-ray analysis system of the fracture surface was investigated. Fatigue fracture surfaces of steels, which were obtained under a wide rang of stress ratid some enviromental conditions, were examined to find the correlation between the residual stress on and under the furacture surface and the stress intensity factor(SIF) under fracture surface had formed. The results are summerised as follows.
1) The residual stress could be measured even on the fracture surface on which the exide on the corrosive products were induced. The residual stress, however, was not useful as an input information for the quantitative analysis of fracture, since is was much influenced by surface parameters such as toughness.
2) The residual stress under the fracture surface, which was obrained by successive removal of the thin layer from original fracture surface, counld be used as a useful information for the quanitative analsys of freacture.
3) It was found that the residual stress under the fatigue fracture surface was less influenced by the stress ratio, unless the stress tratio increased beyond a higher value of 0.5. The estimation of K_<max>, the maximum value of SIF, could be made on the basis of this residual stress under the fracture surface, which <delta>K, the range of SIF, could not be estimated.
4) A new method of estimating K_<max> was proposed. A-master curve in the residual stress distribution under ther fracture surface was produced from the experimetal data. The proposed method was formulated by using th emaster curve. The valus K_<max> could be estimated by the method from two values of the residual stress at two different depths. The proposed method was successfully applicable to the fatrigur fracture surface under corrosive environment.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 小倉敬二: 材料. 35. 719-724 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小倉敬二: 日本機械学会講演論文集. 864. 10-12 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小倉敬二: 材料. 36. 799-804 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小倉敬二: 材料.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Keiji, OGURA: "X-ray Fractographic Study ob Fatigue Surface at Elevated Temperatutres" J. Soc. Mater., Japan. 35-394. 717-724 (1986-7)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Keiji, OGURA: "X-Ray Fractographic Study of Corrosion Fatigue Fracture Surface of SM50A Steel" in NaCl Solution Preprint of the Japan Soc. Mech. Eng.864-2. 10-12 (1986-3)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Keiji, OGURA: "A Simplified X-Ray Analysis of Franctured Surface by Uins Sub-Surface Information" J. Soc. Mater. Sci., Japan. 36-407. 799-804 (1987-8)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Keiji, OGURA: "A Contitative Analysis of Fatigue Fracutre Surface by X-ray Fractography" J. Soc. Mater. Sci., Japan.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小倉敬二: 材料. 35. 719-724 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 小倉敬二: 材料. 36. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 小倉敬二: 第23回X線材料強度に関するシンポジウム講演論文集(日本材料学会). 152-155 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 小倉敬二: 第23回X線材料強度に関する討論会講演論文集(日本材料学会). 56-67 (1986)

    • Related Report
      1986 Annual Research Report

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

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