Multiaxial fatigue life estimation based on combined deviatoric strain amplitudes

This contribution presents a model for multiaxial fatigue life estimation where a combination of deviatoric strain amplitudes defines the fatigue parameter. It also takes into account the influences of both hydrostatic stresses and mean deviatoric stresses. Assessment considers 211 proportional and non-proportional strain-controlled programs reported in the literature, including a number of cases with mean strains/stresses, for three steels and two aluminum alloys. The resulting life estimates correlates well with the experiments, falling in most cases within a factor of two bandwidth.