Numerical analysis of the stress leading to fatigue failure on a coil spring of the front suspension of a car

Abstract

This study discussed the failure of the coil spring of a vehicle using a numerical method. The component was fabricated using ASTM A227. The coil spring was analyzed under three types of conditions, namely, flawless, defect of 0.2 mm, and defect of 3.5 mm. The simulation results show that the maximum shear stress of 745.8 MPa occurs on the spring with a defect of 3.5 mm. This value is close to the allowed shear stress, which is 799 MPa, but exceeded the yield strength of 731 MPa. This results in plastic deformation and contributes to failure due to fatigue.