A numerical investigation of constraint effects in circumferentially cracked pipes and fracture specimens including ductile tearing

J –CTOD relations in clamped SE(T) fracture specimens including 3-D stationary and growth analysis

“…This specimen geometry exhibits a marked decrease in crack-tip constraint most likely associated with development of strong tensile (membrane) stress fields accompanied by a small bend moment derived from little (or even negligible) specimen rotation. Indeed, previous study of Sarzosa and Ruggieri [50] convincingly demonstrates the dramatic loss of crack-tip constraint in clamped SE(T) specimens with a=W ¼ 0:1 as quantified by highly negative values of parameter Q (see more details on the J À Q approach in the works of O'Dowd and Shih [51] and Dodds et al [52]). These features thus provide some justification for the observed behavior as, for a given applied J, the diminished specimen rotation suppresses more intense crack opening thereby producing smaller CTODs compared to other specimen geometries with a=W P 0:2.…”

Structural reliability assessment of cracked pipes: The role of probability of detection data

“…The only acting load considered is that caused by the internal pressure in the pipe. Due to discontinuous yielding behaviour of the API 5 L X 70 steel, in the FAD , , Figure . In the MCS analysis five replications were made, each one of 10 5 simulations, the results shown correspond to their average (which is equivalent to making one run of 5 × 10 5 simulations).…”

Experimental fatigue crack growth analysis and modelling in part‐through circumferentially pre‐cracked pipes under pure bending load

“…Fatigue crack growth study in pressure vessels and piping is being carried out by many researchers [13][14][15][16][17][18][19][20][21][22][23] . Darcis et al 18 reported the experimental investigation of fatigue crack growth rates in ferrite-pearlite pipeline steels using curved middle-tension M(T) specimens.…”