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An improved fatigue life prediction model for shock absorber cylinder with surface roughness correction

Haijie Wang (School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China and School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China)
Xintian Liu (School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China)
Que Wu (School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China)
Xiaolan Wang (School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China)
Yansong Wang (School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China)

Engineering Computations

ISSN: 0264-4401

Article publication date: 11 January 2021

Issue publication date: 9 July 2021

237

Abstract

Purpose

The purpose of this paper is to obtain a more accurate fatigue life of structures by introducing the surface roughness into fatigue life prediction model.

Design/methodology/approach

Based on the fatigue life prediction model with surface roughness correction, the shock absorber cylinder is taken as an example to verify the feasibility of the improved method. Based on the load of the shock absorber cylinder during driving, fatigue experiments are performed under longitudinal and lateral forces, respectively. Then, the fatigue life predicted by the modified model is compared with that predicted by the traditional model.

Findings

By comparing with the test results, considering the influence of mean stress, the Manson method is more accurate in life prediction. Then, the modified Manson-Coffin and Manson method with surface roughness is more accurate in life prediction under longitudinal force and lateral forces, respectively. This verifies the feasibility of the improved method with the surface roughness.

Originality/value

The research on the influence of surface roughness on fatigue life can lay the technical foundation for the life prediction of products and have great significance to the quality evaluation of products.

Keywords

Acknowledgements

The authors would like to thank the support from the National Natural Science Foundation of China (51675324).

Citation

Wang, H., Liu, X., Wu, Q., Wang, X. and Wang, Y. (2021), "An improved fatigue life prediction model for shock absorber cylinder with surface roughness correction", Engineering Computations, Vol. 38 No. 6, pp. 2713-2732. https://doi.org/10.1108/EC-05-2020-0263

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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