Journal of Northeastern University(Natural Science) ›› 2022, Vol. 43 ›› Issue (6): 864-871.DOI: 10.12068/j.issn.1005-3026.2022.06.015

• Mechanical Engineering • Previous Articles     Next Articles

Fatigue Life Assessment of a Vehicle Steering Knuckle and Probability Distribution of Its Local Crack Size

ZHOU Yi-fu1,2, LI He1,2   

  1. 1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China; 2. Key Laboratory of Vibration and Control of Aero-Propulsion System, Ministry of Education, Northeastern University, Shenyang 110819, China.
  • Revised:2021-08-10 Accepted:2021-08-10 Published:2022-07-01
  • Contact: LI He
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Abstract: The steering knuckle is used to transfer and bear the front load of the vehicle, support and drive the front wheel to rotate around the kingpin to make the automotive turn. Aimed at the fatigue failure of a McPherson-type steering knuckle which is still at the development stage, a method is proposed to evaluate the rig test results based on its actual connection situation in the system, and the fatigue rig test is carried out under multiple working conditions. The failure cycle number distribution of the steering knuckle is evaluated by using Weibull distribution theory and N50% and N90% criteria. At the same time, a probability distribution prediction model of local fatigue crack size is derived, and the applicability of the proposed prediction model is verified by the experimental data.

Key words: steering knuckle; front suspension system; fatigue test; Weibull distribution; crack size distribution

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