Mean stress effect on fatigue strength of stainless steel |
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| Affiliation: | 1. Department of Mechanical Engineering, Mississippi State University, MS 39762, USA;2. Center for Advanced Vehicular Systems (CAVS), Mississippi State University, MS 39762, USA;3. Department of Mechanical Engineering, Auburn University, Auburn, AL 36849, USA;1. School of Aeronautics Science and Engineering, Beihang University, Beijing 100191, China;2. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. Research and Experiment Department, Tokyo Roki Co., Ltd., 1-9-1 Tana Shioda, Chuo-ku, Sagamihara 252-0245, Japan;2. Department of Mechanical Engineering and Materials Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;1. School of Mechanical Electronic & Control Engineering, Beijing Jiaotong University, Beijing 100044, China;2. Metals & Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China;3. LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;4. School of Science, Harbin Institute of Technology, Shenzhen 518055, China |
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| Abstract: | Influence of mean stress on fatigue life and fatigue limit was investigated for Type 316 stainless steel. The results for prestrained specimens revealed that fatigue life was almost the same in the same strain range regardless of stress amplitude, maximum peak stress and mean strain. The fatigue life was shortened when applying the mean stress for the same strain range, whereas it was increased for the same stress amplitude. It was shown that the reduction in fatigue life was brought about by the change in the effective strain range, which was caused by the increase in minimum peak stress and the ratcheting strain. The fatigue life could be predicted conservatively even if the mean strain was applied by assuming the effective strain range to be equal to the total strain range (by assuming the crack mouth to be never closed). It was concluded that the mean stress correction was not necessary for the load-controlled cyclic loading and for the region where the ratcheting strain was constrained. |
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| Keywords: | Mean stress Stainless steel Fatigue limit Ratcheting strain Design fatigue curve |
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