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Fatigue Life Evaluation of Suspension Knuckle Using Multibody Simulation Technique

M., Kamal and M. M., Rahman and Abdul Ghaffar, Abdul Rahman (2012) Fatigue Life Evaluation of Suspension Knuckle Using Multibody Simulation Technique. Journal of Mechanical Engineering and Sciences (JMES) , 3. pp. 291-300. ISSN 2289-4659 (print); 2231-8380 (online)

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Suspension is part of automotive systems, providing both vehicle control and passenger comfort. The knuckle is an important part within the suspension system, constantly encountering the cyclic loads subjecting it to fatigue failure. This paper presents an evaluation of the fatigue characteristics of a knuckle using multibody simulation (MBS) techniques. Load time history extracted from the MBS is used for stress analysis. An actual road profile of road bumps was used as the input to MBS. The stress fluctuations for fatigue simulations are considered with the road profile. The strain-life method is utilized to assess the fatigue life. The instantaneous stress distributions and maximum principal stress are used for fatigue life predictions. Mesh sensitivity analysis has been performed. The results show that the steering link in the knuckle is found to be the most susceptible region for fatigue failure. The number of times the knuckle can manage a road bump at 40 km/hr is determined to be approximately 371 times with a 50% certainty of survival. The proposed method of using the loading time history extracted from MBS simulation for fatigue life estimation is found to be very promising for the accurate evaluation of the performance of suspension system components.

Item Type: Article
Uncontrolled Keywords: Fatigue, multibody simulation, suspension system, knuckle, strain-life method, maximum principal stress
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Centre of Excellence: Automotive Engineering Centre
Centre of Excellence: Automotive Engineering Centre

Faculty of Mechanical Engineering
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 03 Aug 2016 01:33
Last Modified: 29 Jan 2018 00:18
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