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    The Effect of Mean Stress on Fatigue Strength of Plain and Notched Stainless Steel Sheet in the Range From 10 to 107 Cycles

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    Stainless steel sheet (18Cr-9Ni) was tested in fatigue under axial-load cycling in plain and notched conditions. Various stress ratios were used ranging from R = −1.0 to +0.91, and endurances (see Definitions) from 10 to 107 cycles were covered using testing frequencies of 5 to 15 cpm and 3000 cpm.

    The effect of mean stress on notch fatigue strength could not be predicted empirically solely from unnotched material data; at least one notched fatigue curve would be required.

    A fatigue strength reduction factor based on maximum stress for a particular mean stress and endurance provided the most reliable correlation between unnotched and notched data.

    Low-cycle and high-cycle fatigue curves matched up only to a limited extent at the overlap, but there was generally strength reduction at low frequency. Under certain conditions of mean stress and stress ratio a cyclic creep or ratchetting mechanism leading to ductile rupture was obtained at low endurances.

    Simple functions existed in the low-cycle region between stress range and plastic strain range and total energy and cycles to fracture, both of which were largely independent of stress ratio.

    Author Information:

    Bell, W. J.
    Rexall Chemical Co., Odessa, Tex

    Benham, P. P.
    Lecturer in Applied Mechanics, Imperial College, London,

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP44458S