Simulation Of Fatigue Life Analysis Of Lower Suspension Arm Over Different Road Profiles

Goh, Chee Hui (2021) Simulation Of Fatigue Life Analysis Of Lower Suspension Arm Over Different Road Profiles. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Fatigue life is an important factor that cause failure in a component. Unlike other type of failure, fatigue failure has no warning or failure indication as it is caused by a microscopic crack and gradually grow into a macroscopic crack. Such failure often happens in a vehicle suspension system as suspension system experience numerous load application due to uneven road and imperfect road design. One of the common components that experience fatigue stress is lower suspension arm. Lower suspension arm is a hinge that connect the wheel and suspension system to the chassis of a car. Lower suspension arm experiences a lot of load as the car drive such as linear deflection, moment of roll, moment of yaw and moment of pitch. As the result of the repetitive loads, fatigue failure often found in lower suspension arm causing issue several issue to car such as instability and even wheel coming off when driving. Hence, this project focus on fatigue life analysis on lower suspension arm. The analysis is done by using strain-based analysis as it analyses the plastic deformation occur in a local region as opposed to stress-based analysis which is based on nominal stress as reference. The analysis is also done with uniaxial approach instead of triaxial approach. Uniaxial as the name suggest uses data on only one axis while triaxial uses data on three axes. Although triaxial approach is able to analyse non-proportional strain data and taking out-of-phase strain into account, uniaxial is more commonly used as it localized the strain acting on the lower suspension arm. In this study, finite element analysis is used to simulate the fatigue life of lower control arm in four different strain history. From the analysis, it is found that the fatigue life of lower suspension arm is 0.314×104 cycle when bracket strain history is applied, 69.056×104 cycle when suspension strain history is applied and 8.380×104 cycle when the transmission strain history is applied

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