Abstract
Combined low and high cycle loading of AISI 4140 steel during service has a significant effect on its fatigue performance, compared to pure low or high cycle loading. In this study, we analyzed the combined low and high cycle fatigue (CCF) responses of AISI 4140 steel under different frequency ratios (20%-30%), and stress amplitude ratios (100–1000). The results indicated that the higher the stress amplitude ratio and frequency ratio, the shorter was the fatigue life of CCF. The fatigue life prediction model was established based on the crystal plasticity theory, the fatigue indicator parameters were obtained from the microstructure evolution, and then fatigue life under different stress amplitude ratios and frequency ratios was predicted. Comparison of the predicted and experimental results demonstrated that the predicted lives were located within thrice the scatter band.
Published Version
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