Effects of inclusion size and stress ratio on fatigue strength for high-strength steels with fish-eye mode failure

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• 作者：Chengqi Sun ; Zhengqiang Lei ; Jijia Xie ; Youshi Hong ; ^{hongys@imech.ac.cn}
• 关键词：Very-high-cycle fatigue ; Inclusion size ; Stress ratio ; Fatigue strength ; High-strength steels
• 刊名：International Journal of Fatigue
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：48
• 期：Complete
• 页码：19-27
• 全文大小：805 K

文摘

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 ¦Ò_a is expressed as ¦Ò_a ¡Ø a₀^m[(1 ? R)/2]^¦Á, where m and ¦Á are material parameters. The predicted results are in good agreement with our experimental results and the ones reported in literature.