Authors: Jia Liu Jing Li Zhongping Zhang
Publish Date: 2012/03/10
Volume: 22, Issue: 4, Pages: 1161-1169
Abstract
In this article a fatigue damage parameter is proposed to assess the multiaxial fatigue lives of ductile metals based on the critical plane concept Fatigue crack initiation is controlled by the maximum shear strain and the other important effect in the fatigue damage process is the normal strain and stress This fatigue damage parameter introduces a stresscorrelated factor which describes the degree of the nonproportional cyclic hardening Besides a threeparameter multiaxial fatigue criterion is used to correlate the fatigue lifetime of metallic materials with the proposed damage parameter Under the uniaxial loading this threeparameter model reduces to the recently developed Zhang’s model for predicting the uniaxial fatigue crack initiation life The accuracy and reliability of this threeparameter model are checked against the experimental data found in literature through testing six different ductile metals under various strain paths with zero/nonzero mean stress
Keywords: