Abstract
Many of engineering structures operate under the presence of residual stresses due to welding or other manufacturing processes. Because of the magnified effects of residual stress on crack growth behaviour, corrections for residual stress are needed for appropriate fatigue life estimation and fracture resistance analysis of cracked structures subjected to mixed mode I and II loading. In this paper, the effect of various residual stress profiles on the crack tip parameters is studied. To make the results more general, two types of butt welds are assumed and the corresponding residual stresses due to the weld are estimated. Than, the effect of residual stress on the crack tip parameters are calculated for complete range of mode mixities from pure mode I to pure mode II and for different crack lengths. It was found that the influence of welding residual stress on the crack tip parameters can be considerable, depending on the stress field, the loading direction, and geometry. In this research, the finite element method is employed to determine the residual stresses and the related stress intensity factors.
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