STP942

    Viscoplasticity Based on Overstress Applied to Creep-Fatigue Interaction

    Published: Jan 1988


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    Abstract

    The uniaxial version of the viscoplasticity theory based on overstress is applied to the deformation behavior of Type 304 stainless steel at 650°C. The effects of strain rate, waveform, and position of hold-time are computed for a cyclic steady-state as well as the ratchetting behavior under zero-to-tension load control.

    The computations of deformation behavior are used in correlating and predicting the low-cycle fatigue life at 593°C using the strainrange partitioning method as well as an incremental damage accumulation law developed previously. The results of the computations exhibit the appropriate trends, but can show deviations from actual life exceeding a factor of two. Considering all the uncertainties, the results are deemed acceptable and promising.

    The incremental damage accumulation law permits application to arbitrary stress or strain histories. The effect of position of hold-time on the hysteresis loop is computed and shown to exhibit the appropriate trend.

    Keywords:

    low-cycle fatigue, life prediction, stainless steel, elevated temperature, constitutive equation, mathematical modeling


    Author Information:

    Krempl, E
    Rensselaer Polytechnic Institute, Troy, NY

    Lu, H
    Rensselaer Polytechnic Institute, Troy, NY

    Bendix Corporation, South Bend,

    Satoh, M
    Rensselaer Polytechnic Institute, Troy, NY

    Nippon Kokan KK, Tokyo

    Yao, D
    Rensselaer Polytechnic Institute, Troy, NY


    Paper ID: STP24479S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24479S


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