The Fatigue Design of Electrical Spot Weldments
by
M. H. Swellam
G. Banas
F. V. Lawrence
Abstract
A general parameter (Ki) is proposed which reflects the magnitude of the stress field at the periphery of the spot weld and which correlates the fatigue behavior of all spot weld geometries in terms of normal, shear, and bending forces (P, Q and M) applied to the weldment. The Ki is an empirically derived quantity which is based on the concepts of mixed mode fracture mechanics and experimental data. The Ki parameter allows the engineer to predict the fatigue behavior for any spot weld for which the applied maximum values of the loads P, Q and M are known from experiment or global structural analysis. Examples of the application of Ki to spot-weld fatigue design are given.
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