6. Conclusions
The main purpose of this paper was to improve the life prediction ability by studying the fatigue driving stress model, considering the loading interactions and adding the interaction factor to the fatigue driving stress model. The main work was summarized as follows:
A new fatigue residual life prediction model was proposed by analyzing the fatigue driving force evolution, based on making the original evolution curve shift. The effects of the loading interaction were considered by introducing the ratio of two stresses into the fatigue driving stress equivalence equation.
The validity of the new model was verified by using experimental data from two-stage and four-stage loadings. Compared with Miner’s rule, the K-R model, Zhu’s model, and Li’s model, the proposed model gives more satisfactory predictions and shows the ability to combine loading sequences and loading interactions.