STP1191: A Multiaxial Fatigue Criterion Including Mean-Stress Effect

    Ellyin, F
    Professor, University of AlbertaInstitute of Machine Design Fundamentals, Warsaw Technical University, EdmontonWarsaw, Alberta

    Kujawski, D
    Research associate, University of AlbertaInstitute of Machine Design Fundamentals, Warsaw Technical University, EdmontonWarsaw, Alberta

    Pages: 12    Published: Jan 1993


    Abstract

    An energy-based criterion for multiaxial fatigue which includes the influence of mean stress in an explicit form is presented. The criterion is applicable to fatigue lives up to initiation of a small size crack and could be classified as a criterion for the initiation of macroscopic cracks. The appropriate fatigue damage variable is defined as a function of the mechanical input of the distortion energy per reversal of loading, the level of tensile mean stress, and the nature of the imposed constraint. A fatigue failure criterion is obtained by plotting the damage variable versus number of reversals to failure to produce a “master” life curve. The effect of mean stress on fatigue life is described in a consistent manner for both high- and low-cycle fatigue. The predictions of the proposed criterion are compared with experimental data, and the agreement is found to be good.

    Keywords:

    biaxial and multiaxial fatigue, distortion strain energy, principal strain ratio, mean stress, constraint factor, in-phase cyclic loading


    Paper ID: STP24795S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24795S


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