The propagation of a circumferential external surface crack in a metallic round pipe under cyclic bending loading is examined through a two-parameter theoretical model. A finite element analysis is carried out to determine the stress-intensity factor distribution along the front of the flaw, which is assumed to present an elliptical-arc shape with aspect ratio α=ael/bel (ael, bel=ellipse semi-axes). The relative depth ξ of the deepest point on the front is equal to the ratio between the maximum crack depth, a, and the pipe wall thickness, t. The parameter R/t, with R=internal radius of the pipe, is made to vary from 1 to 10. The fatigue growth of the surface flaw occurs according to preferred paths in the diagram of α against ξ.
Part-through cracks in pipes under cyclic bending / CARPINTERI, Andrea; BRIGHENTI, Roberto; SPAGNOLI, Andrea. - In: NUCLEAR ENGINEERING AND DESIGN. - ISSN 0029-5493. - 185:(1998), pp. 1-10. [10.1016/S0029-5493(98)00189-7]
Part-through cracks in pipes under cyclic bending
BRIGHENTI, Roberto;
1998
Abstract
The propagation of a circumferential external surface crack in a metallic round pipe under cyclic bending loading is examined through a two-parameter theoretical model. A finite element analysis is carried out to determine the stress-intensity factor distribution along the front of the flaw, which is assumed to present an elliptical-arc shape with aspect ratio α=ael/bel (ael, bel=ellipse semi-axes). The relative depth ξ of the deepest point on the front is equal to the ratio between the maximum crack depth, a, and the pipe wall thickness, t. The parameter R/t, with R=internal radius of the pipe, is made to vary from 1 to 10. The fatigue growth of the surface flaw occurs according to preferred paths in the diagram of α against ξ.File | Dimensione | Formato | |
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