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External surface cracks in shells under cyclic internal pressure
Author(s) -
Carpinteri Andrea,
Brighenti Roberto,
Spagnoli Andrea
Publication year - 2000
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.2000.00320.x
Subject(s) - curvature , superposition principle , shell (structure) , stress intensity factor , finite element method , internal pressure , crack tip opening displacement , crack closure , materials science , structural engineering , surface (topology) , crack growth resistance curve , stress (linguistics) , principal stress , mechanics , fracture mechanics , fracture (geology) , geometry , mathematics , composite material , engineering , mathematical analysis , physics , shear stress , linguistics , philosophy
The stress analysis and fatigue crack growth behaviour of a part‐through‐cracked double‐curvature thin‐walled shell is examined. An external surface crack is assumed to lie in one of the principal curvature planes of the shell, and to present a semi‐elliptical shape. The stress intensity factors (SIFs) along the crack front for different elementary opening stresses acting on the crack faces are determined through a three‐dimensional finite element analysis. Then approximate values of SIF in the case of a cracked pressure vessel are computed by employing the above results together with the superposition principle and the power series expansion of the actual opening stress. Finally, a numerical simulation procedure is carried out to predict the crack growth under cyclic internal pressure. Some results are compared with those of other authors.