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Abstract

In this study, the cyclic deformation behavior and fatigue life of AISI 304 stainless steel with or without mean strains were studied experimentally. In the case of fully reversal cyclic straining, it is found that there is no virtually difference between the cyclic stress response curves in tension and in compression at strain amplitude of higher than 0.30%. At the controlled strain amplitude of 0.25% and 0.30%, the two cyclic stress response curves are separated quite widely. The degree of asymmetry can be attributed to the anisotropic behavior of AISI 304 stainless steel. Further, the experimental results indicate that AISI 304 stainless steel has a cyclic softening characteristic and exhibits Massing behavior at controlled strains amplitudes of higher than 0.35%. Meanwhile, in investigating the influences of mean strain on the cyclic deformation behavior and fatigue life, a cyclic-dependent relaxation of the mean stress occurs and the stable mean stress exerts a relatively greater effect on the fatigue life. In this study, both damage parameters are applied to the predictions of fatigue life in term of life prediction. From a comparison between the experimental and the predicted fatigue life, the both damage parameters provide reasonable life predictions and found that the (σmax εa)p parameter possess a better ability than the SWT damage parameter.

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