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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.
biaxial and multiaxial fatigue, distortion strain energy, principal strain ratio, mean stress, constraint factor, in-phase cyclic loading
Professor, University of AlbertaInstitute of Machine Design Fundamentals, Warsaw Technical University, EdmontonWarsaw, Alberta
Research associate, University of AlbertaInstitute of Machine Design Fundamentals, Warsaw Technical University, EdmontonWarsaw, Alberta