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Cyclic Constitutive Relation and Estimation of Biaxial Low Cycle Fatigue Life at Elevated Temperature

Research Project

Project/Area Number 60460084
Research Category

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

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionRitsumeikan University

Principal Investigator

OHNAMI Masateru  Faculty of Science and Engineering, Ritsumeikan University, 理工学部, 教授 (60066587)

Co-Investigator(Kenkyū-buntansha) SAKANE Masao  Faculty of Science and Engineering, Ritsumeikan University, 理工学部, 助手 (20111130)
元家 勝彦  広島電機大学, 教授 (10069198)
MOTOIE Katsuhiko  Hiroshima-Denki Institute of Technology
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥5,500,000 (Direct Cost: ¥5,500,000)
KeywordsHigh Temperature / Low Cycle Fatigue / Biaxial Stress / Constitutive Relation / Dislocation / X-ray Diffraction / 非比例負荷
Research Abstract

Cyclic biaxial constitute relation was determined for an austenitic stainless steel SUS 304 and 1Cr-1Mo-1/4V aged and non-aged steels in the three test methods under combined push-pull and reversed torsion load at 823 K. The three test methods were the companion method, incremental/decremental method (I/D method) and step-up method. For 1Cr-1Mo-1/4V steel only the companion test was carried out. Proportional and non-proportional tests were carried out for SUS 304 steel in the I/D method. The major conclusions obtained are as follows.
1. The biaxial cyclic constitutive relation in the three test methods is well correlated by the Mises equivalent stress and stress except 1Cr-1Mo-1/jV aged steel. The scatter of the data in the companion test is comparatively large. 2. The cyclic constitutive relation in the companion test differs from that in the I/D test. The cyclic hardening exponent in the companion test is larger than that in the I/D test.
3. Larger cyclic stress amplitude is observed in the non-proportional test in comparison with the proportional test. The cause of the increase in the stress amplitude due to the non-proportional loading is discussed by TEM observations and X-ray diffraction. A simple equation to estimate the stress amplitude in the non-proportinal test is proposed. The estimated results based on the equation agree well with the experimental results.
4. FEM analysis is made for plate notched specimens using the cyclic constitutive relations obtained in the companion and the I/D tests in order to know how the difference in the constitutive relation affects the low cycle fatigue design life. The calculated results using both the constitutive relations do not differ each other, so that the difference in the constitutive relation due to the test method does not have an large effect on the design fatigue life.

Report

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

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 西野精一: 日本材料学会第34期学術講演会前刷. 79-81 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 西野精一: 第23回高温強度シンポジウム前刷集(日本材料学会). 5-9 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Seiichi Nishino: Fatigue Fract.Engng.Mater.Struct.Vol.9. 65-77 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Masateru,Ohnami: Inter.Journal of Plasticity.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Seiichi, Nishino: "Cyclic Deformation Behavior of SUS 304 Steel in Elevated Temperature Biaxial Proportional and Non-Proportional Loading Conditions" Preprint of 34th Annual Meeting of the Japan Society of Materials Science. 79-81 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Seiichi, Nishino: "Effect of Strain History on the Cyclic Deformation Behavior of SUS 304 Steel at Elevated Temperature" Proceedings of 23rd High Temperature Strength of Materials, the Japan Society of Materials Science. 5-6 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Seiichi, Nishino: "Microstructural Study of Cyclic Strain Hardening Behavior in Biaxial Stress States at Elevated Temperature" Fatigue and Fracture of Engineering Materials and Structures. 9. 65-77 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Masateru, Ohnami: "Cyclic Behavior of a Type 304 Stainless Steel in Biaxial Stress States at Elevated Temperature" International Journal of Plasticity.

    • 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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