Abstract
A mechanics model of a spot weld in a finite plate under general loading conditions is presented first. Available closed-form stress, moment and transverse shear force solutions are then discussed for a plate with a rigid inclusion subjected to various types of loading conditions. Based on a strip model, closed-form analytical stress intensity factor solutions for spot welds are presented under various types of loading conditions. A kinked crack growth model is then presented and adopted to predict the fatigue lives of resistance spot welds in lap-shear specimens of dual phase, low carbon and high strength steels. Comparisons of predicted fatigue lives based on the kinked crack growth model with the experimental data indicate that the fatigue life predictions are in agreement with or lower than the experimental data.
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