Multiaxial fatigue life prediction model based on an improved strain energy density criterion

Abstract

Based on the critical plane approach and the shear damage model, a new damage parameter based on the strain energy density criterion is proposed. This parameter takes into account the interaction between shear stress and hydrostatic stress during microcrack initiation and the contribution of hydrostatic strain energy density to fatigue damage. On this basis, a new multiaxial fatigue life prediction model is established by combining the Basquin-Manson-Coffin equation. The analysis results of five metal materials show that the predicted life correlated well with the experimental observations. The merits of the proposed model are further highlighted by the comparison between the results of the proposed method and those of two fatigue damage prediction models.