A Three-Parameter Multiaxial Fatigue Life Prediction Model Considering the Influence of Mean Stress

Abstract

Since the Manson–Coffin model cannot characterize the existence of a fatigue limit, this paper develops a novel multiaxial fatigue life prediction model that accounts for the significant influence of mean stress and non-proportional loading-induced additional hardening on multiaxial fatigue life. The proposed model is based on a generalized three-parameter framework that accounts for mean stress effects. Furthermore, this developed model incorporates the Walker exponent to reflect material sensitivity to mean stress and utilizes a damage parameter defined on the critical plane to account for multiaxial fatigue loading. A comparative analysis of predicted and experimental results was conducted using 484 experimental data points collected from the literature for 14 different materials. The statistical assessment shows that 93.4% of the data points fall within a factor-of-three life scatter band, demonstrating that the proposed multiaxial fatigue model offers good prediction accuracy and wide material applicability.