Comparative analysis and evaluation of the commonly-used fatigue life prediction models under various multiaxial loadings

This paper uses five materials to compare and analyze the life estimation results of six commonly-used critical plane models for multiaxial fatigue life. It is found that the estimation results of different models differ significantly for the same material. For the different materials, the estimation results of the same model are sometimes lower than the test results and sometimes higher than the test results. Among the six commonly-used critical plane models, the Fatemi-Socie model can provide satisfactory fatigue life prediction results for shear cracking materials. The reliability of life estimation results by different life prediction models depends on whether the fatigue damage parameters in the prediction model are reliable, and also on whether the expression of the prediction model is reasonable. In addition, the prediction results of the model are also related to the cracking form of the material. Based on the verification results, the applicability of each model was evaluated, and it was pointed out that further research is needed on the applicable conditions of commonly-used critical plane models.