A Flaw Proximity Rule for Circumferential Surface Cracks on Pipe Under Tensile Loading Based on Limit Load Analysis Available to Purchase

The influence of interaction between two surface cracks on the limit load (LL) was examined by finite element analysis. Cicumferential surface cracks were assumed to be on a straight pipe that was subjected to a uniform tensile load. The results obtained under vaiours relative spacings of cracks and pipe geometries revealed that the magnitude of LL depends on the offset distance of the cracks and ratio R_m/t, where R_m is mean radius of pipe and t is thickness of pipe. Furthermore, regardless of pipe geometry, LL is almost equivalent to that of a coalesced crack when the offset and horizontal distance are the same. Based on these results, criteria were proposed for the combination rule, which is appliciable to the procedure of modeling multiple cracks in integrity analysis of flawed components.