Abstract
A new engineering method for spot welds fatigue life prediction of commercial vehicle cab is presented. The method stars with the establishment of 3D FE model and spot weld model of the cab using the MSC. Nastran, the verification of the model is performed through modal analysis results comparation between the experiment and the simulation. Then the general fatigue life prediction method of the virtual commercial vehicle cab with spot weld is introduced. The unit force stress response of the cab is calculated by inertia relief method. At last, the cab stress response, the cab input load spectrum, cab structure and spot weld S-N curves, are imported into the MSC. Fatigue. The fatigue life prediction results indicate that the fatigue strength of most locations of the cab structure and spot welds is high and local positions such as the cab front window corners and the cab mounts are a little bit lower. And also, the influence of the metal material and the spot weld diameter to the vehicle cab fatigue life is analyzed. Keywords-commercial Vehicle Cab, spot Weld, fatigue Life Prediction, finite Element Method.
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