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Fracture Mechanics Analysis of a Interface Crack in the Weld of Dissimilar Steels using the J-integral  

Lee Chin-Hyung (중앙대학교 공과대학 토목공학과)
Chang Kyong-Ho (중앙대학교 공과대학 건설환경공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.17, no.4, 2004 , pp. 423-431 More about this Journal
Abstract
For the fracture mechanics analysis of cracks in welds of dissimilar steels, residual stress analysis and fracture analysis must be performed simultaneously. The standard definition of the J -integral leads to a path dependent value in the presence of a residual stress field. And unlike cracks in homogeneous materials, a bimaterial interface crack always induces both opening and shearing modes of stress in the vicinity of the crack tip. Therefore, it is necessary to develope a path independent J-integral definition for a crack in a residual stress field generated by welding of dissimilar steels. This paper addresses the modification of the Rice-J-integral to produce a path independent J -integral when residual stresses due to welding of dissimilar steels and external forces are present. The residual stress problem is treated as an initial strain problem and the J-integral proposed for this class of problems is used. And a program which can evaluate the J -integral for a crack in a weld of dissimialr steels is developed using proposed J integral definition.
Keywords
J-integral, dissimilar steels; crack; fracture mechanics; residual stresses;
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