Abstract
In this paper, an attempt is made to extend the total strain energy approach for predicting the fatigue life subjected to mean stress under uniaxial state. The effects of means stress on the fatigue failure of a ferritic stainless steel and high pressure tube steel are studied under strain-controlled low cycle fatigue condition. Based on the fatigue results from different strain ratios, modified total strain energy density approach is proposed to account for the mean stress effects. The proposed damage parameter provides convenient means of evaluating fatigue life with mean stress effects considering the fact that the definitions used for measuring strain energies are the same as in the fully-reversed cycling (R = −1). A good agreement is observed between experimental life and predicted life using proposed approach. Two other mean stress models (Smith-Watson-Topper model and Morrow model) are also used to evaluate the low cycle fatigue data. Based on a simple statistical estimator, the proposed approach is compared with these models and is found realistic.
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S. M. Humayun Kabir was born in Chittagong, Bangladesh. He has completed B.Sc. in mechanical engineering from the Department of Mechanical Engineering in Chittagong University of Engineering & Technology (CUET), Chittagong, Bangladesh, and has also completed Ph.D. on the same major at University of Ulsan, Ulsan, Republic of Korea. His research interests include low-cycle fatigue and solid mechanics.
Taein Yeo, B.S., M.S., Ph.D. is a professor of School of Mechanical and Automotive Engineering at University of Ulsan, Korea since 1993. He was born in Pusan, Korea and has earned B.S. at Pusan National University, Pusan, Korea in 1982 and subsequently, M.S. at KAIST, Seoul, Korea in 1984, both in mechanical engineering. He has completed Ph.D. on the same major at University of Michigan, U.S.A. He has published several journal papers and conference papers and carried out 36 research projects. His research interests include thermo-mechanical fatigue and solid mechanics.
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Humayun Kabir, S.M., Yeo, Ti. Evaluation of an energy-based fatigue approach considering mean stress effects. J Mech Sci Technol 28, 1265–1275 (2014). https://doi.org/10.1007/s12206-013-1155-y
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DOI: https://doi.org/10.1007/s12206-013-1155-y