Abstract
It has been demonstrated that the loading history takes into account the
loading sequence and loading interaction effects. Nonlinear damage
models based on fatigue driving stress theory consider the loading
sequence but exclude the loading interaction effects.
In this study, a novel evolution
curve for fatigue driving stress was created by including the loading
interaction factor in the equation of driving stress evolution. Through
using fatigue driving stress equivalence, the remaining fatigue life
under varying amplitude loading was then predicted by an enhanced
fatigue driving stress model. Compared with Miner’s rule, the K-R model,
Zhu’s model, and Li’s model, this new model gave more accurate and
reliable predictions.