In this paper, limit bending moment equation applicable to all types of planar and non-planar flaw in wallthinned straight pipes under bending was proposed. An idea to rationally classify planar/non-planar flaw in wallthinned pipes was proposed, based on the experimental observation focused on the fracture mode. The resultspoint out the importance to distinguish axially and circumferentially long flaws in wall thinned pipes.
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