A novel approach for corrosion fatigue life estimation under asymmetric cyclic loadings using intrinsic damage dissipation

Abstract

Numerous scholars have conducted theoretical research on corrosion fatigue lifetime prediction models based on continuum damage mechanics and linear fracture mechanics. However, most of the predicted models require several material parameters, making them difficult to apply in practice. For practical application, the existing models, including the Goodman, Gerber, SWT and Walker models, are empirical or statistical and have not gained wide acceptance. Hence, an urgent need exists for an equally simple, easy-to-apply, and mechanics-based model for engineering applications. Therefore, this study proposes a corrosion fatigue stress equation associated with equivalent life based on the intrinsic damage dissipation energy. The method attached to a material parameter can be used to predict corrosion fatigue lifetime and provides a novel approach for easy application. The comparisons of experimental results and the results predicted by our proposal and the existing models were carried out, indicating that our proposal provides better correlations with experimental results than others. The proposal provides great potential for its simplicity in the evaluation of corrosion fatigue lifetime under asymmetric cyclic loadings.