A CRACK GROWTH APPROACH TO LIFE PREDICTION OF SPOT‐WELDED LAP JOINTS

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Abstract
Fatigue behaviour of spot‐welded lap joints is modelled as a single‐degree‐of‐freedom crack growth problem. Although such a model involves simplification of a complicated problem, predictions are in good agreement with experimental results. The model developed here allows a design engineer to analyse the fatigue behaviour of spot‐welded steel sheets, which are commonly used in structures, without knowledge of metallurgical and fine geometric details of spot‐welds. Only fatigue properties of the sheet metal are needed, so no laboratory facilities are required to generate fatigue data specific to spot‐welds or weld metal.

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