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    STP942

    Comparison of Creep-Fatigue Life Prediction by Life Fraction Rule and Strainrange Partitioning Methods

    Published: 01 January 1988


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    Abstract

    A comparison of two kinds of creep-fatigue life prediction methods, Life Fraction Rule and Strainrange Partitioning, was performed for the cases of creep-fatigue tests under uniaxial strain-controlled conditions at 500 to 600°C in air, using a normalized and tempered 2 1/4Cr-1Mo steel. The main focus was on the influence of stress-strain behavior on life prediction. Two kinds of stress-strain values (i.e., experimental values and calculated values by inelastic analysis) were used for the life prediction of creep-fatigue tests. The results show that life prediction by the Life Fraction Rule was very sensitive to the stress-strain values, indicating a large discrepancy between predicted and observed lives in some cases, and that life prediction by the Strainrange Partitioning method was not so sensitive to the stress-strain values, indicating a good agreement between predicted and observed lives in all cases.

    Keywords:

    fatigue (materials), creep-fatigue, life prediction, strainrange partitioning, creep properties, plastic properties, cyclic plasticity, inelastic analysis, strain rate, hold time, low alloy steel


    Author Information:

    Yamauchi, M
    Mitsubishi Heavy Industries, Ltd., Nagasaki Research and Development Center, Nagasaki,

    Igari, T
    Mitsubishi Heavy Industries, Ltd., Nagasaki Research and Development Center, Nagasaki,

    Setoguchi, K
    Mitsubishi Heavy Industries, Ltd., Nagasaki Research and Development Center, Nagasaki,

    Yamanouchi, H
    Choryo Engineering Company, Ltd., Nagasaki,


    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24494S