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    STP942

    Application of the Overstress Concept for Creep-Fatigue Evaluation

    Published: 01 January 1988


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    Abstract

    Type 304 stainless steel was subjected to a controlled push-pull strain with a wide variety of waveforms at 650°C in 0.1 μPa vacuum. No indication of oxidation was observed in the specimens. The frequency effect on creep-fatigue behavior was diminished, but the tensile hold time and waveshape effects were still observed in this high vacuum environment. It was concluded that a reduction of fatigue life due to creep-fatigue interaction is observed when a tension going time exceeds a compression going time. A back stress was determined from the data, and an overstress was defined as the difference between an applied stress and a back stress. The overstress was related to the inelastic strain rate. It is shown that overstress can be reasonably used to describe the creep-fatigue damages for life prediction.

    Keywords:

    creep-fatigue, vacuum, Type 304 stainless steel, life prediction, overstress, back stress, time independent, time dependent, damage


    Author Information:

    Morishita, M
    Oh-arai Engineering Center, Ibaragi,

    Taguchi, K
    Toshiba Corporation, Nuclear Engineering Laboratories, Kawasaki,

    Asayama, T
    Graduate Student, Research Fellow, and Professor, University of Tokyo, Tokyo,

    Ishikawa, A
    Graduate Student, Research Fellow, and Professor, University of Tokyo, Tokyo,

    Asada, Y
    Graduate Student, Research Fellow, and Professor, University of Tokyo, Tokyo,


    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24501S