Quantitatively evaluating the mean stress effects in fatigue life predictions is still inconclusive and varies from the used material and given loading conditions. In this paper, a general strain energy model is presented to account for the mean stress effects in fatigue life predictions. Specifically, a concept of mean stress sensitivity is incorporated to modify the total strain energy density by introducing two mean stress correction factors. The capability and accuracy of the proposed model are verified and compared to those of the SWT, Ince-Glinka and GDP models using selected experimental data sets under tensile/compressive mean stress conditions. Results indicate that the proposed model provides better predictions for all data sets analyzed with lower mean value and scatter of model prediction errors than others.
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