Abstract
Due to residual stress in a material, stress intensity factors (SIF) and also J-integral values are not constant and become path dependent parameters. Modified relations are used for calculations to take into account the effects of residual stresses. These relations give path independence values for the J-integrals in spite of existing the residual stresses. Effects of residual stresses due to welding on variations of SIF and J-integral are studied. Results have a good agreement with theoretical values obtained by weight function method. Through and surface cracks are considered on welded plate and distributions of J-integral on the crack front are obtained. Effects of lengths, depths and orientation angles of cracks are investigated due to applying only residual stress and also combination of residual and applied stresses. Redistributions of residual stress are determined for welded plates with through cracks and compared with experimental results in literature.
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