Plastic Collapse Behavior of Pipes with Local Wall Thinning Subjected to Bending Load and Allowable Limit. 1st Report: Plastic Colloapse Behavior of Pipes with Local Wall Thinning.:1st report: Plastic Colloapse Behavior of Pipes with Local Wall Thinning

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In pipes of energy plants, sometime, the local wall thinning may result from severe erosion-coroosion damage. However, effect of local wall thinning on strength and fracture behavior of pipe system were not well studied, systematically. And also allowable limit of the local wall thinning has not been developed for the pipe system.In this paper, effect of depth, shape and location of local wall thinning on strength and failure mode of pipe subjected to bending were studied, systematically. The main results obtained are followings;1) Observed failure modes were elephant foot type local buckling, ovalization, buckling+ovalization and cracking.2) When Mpo≥MY, maximum moment Mmax, was evaluated by using new flow stress σtf proposed in this paper, conservatively.3) When Mpo≥MY, except for craking, pipes with local wall thinning showed enough plastic rotation angle.4) Generally speaking, fracture behavior of pipes with local wall thinning is different from that of cracked pipes.
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