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Fatigue life prediction for automobile stabilizer bar

Shuangshuang Li (School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, China)
Xintian Liu (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)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 4 November 2019

Issue publication date: 18 March 2020

202

Abstract

Purpose

During the running of automobile, the stabilizer bar is frequently subjected to the impact of complex random loads, which is prone to fatigue failure and accident. In regard to this, the purpose of this paper is to study and discuss fatigue life of automobile stabilizer bar.

Design/methodology/approach

Durability bench test shows that failure is located at the joint of sleeve and stabilizer bar body. Based on the collection and compilation of micro-strain load spectrum of the stabilizer bar, the strain-life model is studied considering the influence of average stress and maximum stress at failure area. Seven-grade strain-life curves of the stabilizer bar are established. According to the principle of linear damage accumulation, the relationship between fatigue life and damage is discussed, then the fatigue life of stabilizer bar is predicted. Fatigue life evaluation is carried out from three aspects: reliability analysis, static analysis and fatigue life simulation.

Findings

The results show that the reliability of the test sample is 99.9 percent when the confidence is 90 percent and the durability is 1,073 load spectrum cycles; the ratios of predicted and simulated life to design life are 2.77 and 2.30, respectively.

Originality/value

Based on the road load characteristics of automobile stabilizer bar, the method of fatigue life prediction and evaluation is discussed, which provides a basis for the design and development of automobile chassis components.

Keywords

Acknowledgements

This work is sponsored by the National Natural Science Foundation of China (51675324).

Citation

Li, S., Liu, X., Wang, X. and Wang, Y. (2020), "Fatigue life prediction for automobile stabilizer bar", International Journal of Structural Integrity, Vol. 11 No. 2, pp. 303-323. https://doi.org/10.1108/IJSI-07-2019-0063

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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