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Determining the Walker exponent and developing a modified Smith-Watson-Topper parameter model

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Abstract

Mean stress effects significantly influence the fatigue life of components. In general, tensile mean stresses are known to reduce the fatigue life of components, whereas compressive mean stresses are known to increase it. To date, various methods that account for mean stress effects have been studied. In this research, considering the high accuracy of mean stress correction and the difficulty in obtaining the material parameter of the Walker method, a practical method is proposed to describe the material parameter of this method. The test data of various materials are then used to verify the proposed practical method. Furthermore, by applying the Walker material parameter and the Smith-Watson-Topper (SWT) parameter, a modified strain-life model is developed to consider sensitivity to mean stress of materials. In addition, three sets of experimental fatigue data from super alloy GH4133, aluminum alloy 7075-T651, and carbon steel are used to estimate the accuracy of the proposed model. A comparison is also made between the SWT parameter method and the proposed strainlife model. The proposed strain-life model provides more accurate life prediction results than the SWT parameter method.

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Authors and Affiliations

  1. Institute of Reliability Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, 611731, China

    Zhiqiang Lv, Hong-Zhong Huang, Hai-Kun Wang, Huiying Gao & Fang-Jun Zuo

Authors
  1. Zhiqiang Lv
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  2. Hong-Zhong Huang
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  3. Hai-Kun Wang
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  4. Huiying Gao
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  5. Fang-Jun Zuo
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Corresponding author

Correspondence to Hong-Zhong Huang.

Additional information

Zhiqiang Lv is currently a Ph.D. candidate in Mechanical Engineering in the University of Electronic Science and Technology of China. His research interests include fatigue life prediction and fatigue reliability.

Hong-Zhong Huang is a professor of the School of Mechanical, Electronic, and Industrial Engineering in the University of Electronic Science and Technology of China. He has conducted visiting appointments in several universities in the USA, Canada and Asia. He obtained a Ph.D. in Reliability Engineering from Shanghai Jiaotong University, China and has published 200 journal papers and 5 books in the fields of reliability engineering, optimization design, fuzzy sets theory and product development.

Hai-Kun Wang is currently a Ph.D. candidate in Mechanical Engineering in the University of Electronic Science and Technology of China. He obtained his M.S. in Vehicle Engineering from the South China University of Technology. His research interests include reliability analysis, maintenance decisions, prognostics, and health management.

Huiying Gao is currently a Ph.D. candidate in Mechanical Engineering in the University of Electronic Science and Technology of China. Her research interests include fatigue strength evaluation, fatigue life prediction and fatigue reliability analysis.

Fang-Jun Zuo is currently a Ph.D. candidate in Mechanical Engineering in the University of Electronic Science and Technology of China. Her research interests include fatigue life prediction and design for reliability.

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Lv, Z., Huang, HZ., Wang, HK. et al. Determining the Walker exponent and developing a modified Smith-Watson-Topper parameter model. J Mech Sci Technol 30, 1129–1137 (2016). https://doi.org/10.1007/s12206-016-0217-3

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  • DOI: https://doi.org/10.1007/s12206-016-0217-3

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