Fretting fatigue life estimation using fatigue damage gradient correction factor in various contact configurations
- Authors
- Hwang, Dong Hyeon; Cho, Sung-San
- Issue Date
- Mar-2017
- Publisher
- KOREAN SOC MECHANICAL ENGINEERS
- Keywords
- Fretting fatigue; Plain fatigue; Fatigue damage gradient; Fatigue life; Contact configuration
- Citation
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.31, no.3, pp.1127 - 1134
- Journal Title
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
- Volume
- 31
- Number
- 3
- Start Page
- 1127
- End Page
- 1134
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/6014
- DOI
- 10.1007/s12206-017-0211-4
- ISSN
- 1738-494X
- Abstract
- A fretting fatigue life estimation method that takes into account the stress gradient effect was developed by the authors [Journal of Mechanical Science and Technology, 28 (2014) 2153-2159]. In the developed method, fatigue damage value at the cracking location is corrected with fatigue damage gradient and the corrected value is compared directly with the plain fatigue data for life estimation. In other words, the correction factor is the ratio of plain fatigue damage to fretting fatigue damage at the same life and a function of fatigue damage gradient. Since reliability of the method was verified only for cylinder-on-flat contact configuration in the previous study, the present study extends application of the method to flat-on-flat contact configurations by developing the correction factor for both the contact configuration. Fretting fatigue experiments were conducted to obtain fatigue life data for various fretting pads. Finite element analyses were conducted to evaluate the Smith-Watson-Topper (SWT) fatigue damage parameter in the cracking region. It is revealed that the SWT parameter in fat-on-flat contact configuration decreases exponentially away from the surface as in cylinder-on-flat contact configuration, and thus the SWT gradient at the surface can be evaluated reliably. Moreover, it is found that decrease in the SWT parameter around the cracking location can be expressed by piecewise exponential curves. If the gradient of SWT at the surface is used as a representative value of SWT gradient, it is impossible to establish functional relationship between the SWT gradient and the correction factor for both the contact configurations although it was possible for cylinder-on-flat contact configuration. However, if weighted average of the SWT gradient values obtained from each exponential curve in the piecewise exponential curve is used as a representative value, the correction factor for both the contact configurations becomes a function of the SWT gradient, and thus fretting fatigue life in both the contact configurations can be estimated with a single correction function.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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