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Indexed by:期刊论文

Date of Publication:2021-08-23

Journal:JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY

Volume:34

Issue:12

Page Number:5029-5039

ISSN No.:1738-494X

Key Words:Fatigue driving energy; Life estimation; Material memory; Nonlinear damage model; Variable amplitude loading

Abstract:New nonlinear fatigue damage accumulation model is established on the basis of material memory theory and fatigue driving energy damage parameters to evaluate high-cycle fatigue life under multilevel variable amplitude loading. The loading interaction factor is constructed on the basis of damage degree and then the model is modified to consider the effect of loading interaction on fatigue damage accumulation. The two proposed models are convenient for calculation and have only two parameters that can be easily identified through experiments. In accordance with the test data of aluminum alloy Al-2024-T42, titanium alloy Ti-6Al-4V, nodular cast iron GS61, Q235B welded joint, and hot-rolled 16Mn steel, the two models developed in this study have been verified to predict fatigue life effectively. For multilevel loading, the modified model achieves higher prediction accuracy and its results are closer to the actual test data compared with those of the other models.