Author(s)

Andrea Carpinteri, R. Brighenti & A. Spagnoli

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/bei- The relative depth 5 of the deepest point on the crack front is equal to the ratio between the maximum crack depth a^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. 1 Introduction Several Kj-solutions for edge flaws in plates and round bars have been deduced by using different methods [1-4], but only few authors have examined the behaviour of surface flaws in pipes [5-9]. In the present study, a cir

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