J-Integral Estimation for the 3-D Through-Thickness Centre-Cracks in Welds of Structural Steels

Abstract:

For the fracture analysis of a crack in welds, residual stress analysis and fracture mechanics analysis must be performed sequentially. In this study, characteristics of residual stresses in welds of structural steels (SM490, SM520, SM570) were presented by carrying out three-dimensional (3-D) thermal elastic-plastic finite element (FE) analysis. Then, an FE analysis method which was able to calculate domain-independent values of the J-integral for a crack in a 3-D residual stress bearing body was developed to evaluate the J-integral for a mode-I centre-crack in welds of structural steels when mechanical stresses were applied in conjunction with residual stresses. The results show that the longitudinal residual stresses in welds increase with increasing yield stress of the welded steel (SM490

• Periodical: Materials Science Forum (Volumes 580-582)
• Pages: 125-128
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.580-582.125
• Online since: June 2008
• Authors: Chin Hyung Lee, Kyong Ho Chang
• Keywords: 3D Through-Thickness Centre-Cracks, Ĵ-Integral, Residual Stress, Weld

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