关键词: 副车架, 焊缝疲劳, 焊接接头, 有限元分析, 台架试验

Abstract: In order to predict the fatigue life of the weld of the sub-frame structure, the fatigue S-N curve of the weld was determined through the bench fatigue test of the fillet welding and lap welding. Then the virtual prototype technology is used to obtain the relative damage ratio between the wheel center load and the original road spectrum load to ensure the accuracy of the multi-body dynamics model. Through the finite element weld fatigue simulation analysis, the location where the fatigue life of the sub-frame weld is the smallest is obtained. Finally, the fatigue test of the vehicle's twenty-four channel bench was carried out. The fatigue life times of the bench and the location of the cracks were consistent with the results of the simulation analysis, which verified the reliability of the weld fatigue S-N curve and the prediction results of the simulation analysis.

Key words: Sub-frame, Weld fatigue, Welded joint, Finite element analysis, Bench test