Approximate J Estimates for Circumferential Cracks in between Elbows and Attached Pipes
The present work proposes a method for elastic-plastic fracture mechanics analysis of the circumferential through-wall crack in between elbows and attached straight pipes, subject to in-plane bending. Based on small strain finite element limit analyses, closed-form limit load solutions are given first. Then applicability of the reference stress based method to approximately estimate J is proposed. One interesting finding is that a popular approach to assume that the crack locates in the straight pipe could lead to significantly different assessment results.
S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim
T. K. Song et al., "Approximate J Estimates for Circumferential Cracks in between Elbows and Attached Pipes", Key Engineering Materials, Vols. 345-346, pp. 521-524, 2007