Decades of operating experience related to welded T-joint connections in metallic structureshave shown that fatigue cracks generally develop at welding due to both materialheterogeneity (mismatch) and stress concentration. In the present paper, the fatiguebehaviour of a metallic welded T-joint subjected to cyclic bending is analysed. A semiellipticalsurface crack is assumed to exist at the welding. The crack propagation isnumerically examined by using the stress-intensity factor (SIF) values obtained from finiteelement analyses, and extensively presented in a recent work. Geometry and sizes of thewelded T-joint are chosen in order to compare numerical results with experimental dataavailable in literature, related to an actual welded joint of a common Francis turbinerunner.

Fracture mechanics based approach to fatigue analysis of welded joints

RONCHEI, Camilla;
2015

Abstract

Decades of operating experience related to welded T-joint connections in metallic structureshave shown that fatigue cracks generally develop at welding due to both materialheterogeneity (mismatch) and stress concentration. In the present paper, the fatiguebehaviour of a metallic welded T-joint subjected to cyclic bending is analysed. A semiellipticalsurface crack is assumed to exist at the welding. The crack propagation isnumerically examined by using the stress-intensity factor (SIF) values obtained from finiteelement analyses, and extensively presented in a recent work. Geometry and sizes of thewelded T-joint are chosen in order to compare numerical results with experimental dataavailable in literature, related to an actual welded joint of a common Francis turbinerunner.
T-jointCyclic bendingSurface crackStress-intensity factorFrancis turbine runner
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/304695
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