Fatigue strength prediction for high-strength steels with fish-eye mode failure

摘要

A model is developed to predict the fatigue strength of high-strength steels with fish-eye modefailure,which takes into account the effect of inclusion size at the fracture origin.It is shown that the fatigue strength σa,fatigue life N and inclusion size a0 at the fracture origin are well correlated with σa = Cnla0m,where C,l and m are parameters.Then,the model is used to predict thefatigue strength with the estimated maximum inclusion size under a certain probability,which shows a good agreement with the present experimental results and the ones in literature.The paper also indicates that it may be a way to investigate the reliability of fatigue strength through the probability for determining the maximum inclusion size of materials.