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

CARPINTERI, Andrea;BRIGHENTI, Roberto;SPAGNOLI, Andrea
1998-01-01

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.
1998
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]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2298842
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 40
  • ???jsp.display-item.citation.isi??? 35
social impact