Fatigue Life Prediction Based on Walker and Masson Models



Jie Zhou Hong-Zhong Huang Bo Zheng Zhaochun Peng


It is known that mean stress has significant effects on fatigue life prediction, and various modifications have been developed to explain the mean stress effect, yet seldom accounting for mean stress sensitivity. The Smith-Watson-
Topper (SWT) model is one of the most widely used models that can give satisfactory predictions, and it is viewed as a particular case of Walker model when the material parameter γ = 0.5. The Walker equation takes both the mean stress effect and sensitivity into account and can give accurate predictions in many fatigue programs. In this paper, based on the Walker model and Masson model, a modified model accounting for both the mean stress effect and the mean stress sensitivity is proposed to estimate the fatigue life. Three sets of experimental data are used to validate the applicability of the proposed model. A comparison between the SWT model and Morrow model is also made. The
results show that the proposed model has more accurate predictions than the others.

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