Abstract
The propagation of a circumferential external surface flaw in a metallic round pipe under constant amplitude cyclic axial loading is examined through a two-parameter theoretical model. The surface flaw is assumed to present an elliptical-arc shape with aspect ratio a = a^i/beiThe relative depth 5 of the deepest point on the crack front is equal to the ratio between the maximum crack depth â i and the pipe wall thickness t. The edge flaw being considered is shown to follow preferred propagation patterns in the diagram of a against g.
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