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.