Experimental results indicate that the fatigue life reduces by about two orders of magnitude when inclusion size doubles. Then, a model is proposed for predicting the fatigue strength of high-strength steels with fish-eye mode failure based on the experimental results for the effect of inclusion size and stress ratio. In the model, the effect of inclusion size a0 and stress ratio R on fatigue strength σa is expressed as σa proportional to σa∝a0m[(1 − R)/2]α, where m and a are material parameters. The predicted results are in good agreement with our experimental results and the ones reported in literature.
Sun CQ,Lei ZQ,Xie JJ,et al. Effects of inclusion size and stress ratio on fatigue strength for high-strength steels with fish-eye mode failure[J]. INTERNATIONAL JOURNAL OF FATIGUE,2013-03-01,48:19-27.
