Abstract
When there is residual stress in a material, stress intensity factor (SIF) in liner elastic fracture mechanics (LEFM) approach and J-integral in elastic-plastic fracture mechanics (EPFM) approach have not constant values and are path dependent parameters. In this paper, we used themodified relations for them that take into account the effects of theresidual stress. These relations have constant values in existing of residual stress and are independent of the path. In this study, we investigated a butt welded plate with through thicknesscrack perpendicular to theweld path. TheSIF and J-integral were numerically calculated for applied and residual stresses.Results have a good agreement with theoretical values obtained by weight function method. Also it was shown that the modifiedSIF and J-integral can be used as fracture parameters to obtain other properties of fractured plates and structures.
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