SEDL / STP / STP1191-EB / STP24795S

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

Download this paper for $25 PDF (208K)          View License Agreement
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.