Abstract：Based on the critical plane approach, a new multiaxial fatigue damage parameter with shear form is proposed by means of the von-Mises criterion. This proposed damage parameter is suitable for both proportional and non-proportional loading. Besides, this damage parameter considers the maximum shear strain range and the normal strain range on the critical plane. The effect of the non-proportional cyclic hardening on the fatigue life is taken into account by an introduced stress-correlated factor. It is convenient for engineering application because of no empirical constants in this parameter. The predicted multiaxial fatigue lives of the considered materials (1045HR Steel, S45C Steel, Inconel718 Steel and 16MnR Steel) using the proposed model are found in good agreement with the experimental results.
2012, Vol. 33 