Residual stresses in resistance spot welds: finite element simulations, X-ray measurements and influence on fatigue behaviour

摘要

The present study was carried out to examine the possibilities and effects of including residual stresses and yield stress variation in an FE simulation of the loading of a spot welded specimen. The following conclusions were drawn.It is possible to calculate residual stresses and yield stress variation with reasonable accuracy. The residual stresses have several local maxima and high gradients. The most interesting local maximum is found at the faying surface outside the nuggetperimeter. This shows that the residual stress distribution does not decrease strictly outside the nugget. X-ray measurements are suitable for determining the residual stress state at resistance spot welds.