
Characterisation of the fatigue properties of cast irons used in the water industry and the effect on pipe strength and performance
Author(s) -
Hamed Mohebbi,
David Jesson,
M. Mulheron,
P.A. Smith
Publication year - 2009
Publication title -
journal of physics conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/181/1/012039
Subject(s) - cast iron , materials science , microstructure , metallurgy , paris' law , fracture toughness , toughness , fracture (geology) , residual stress , fracture mechanics , stress concentration , stress intensity factor , composite material , crack closure
As part of an on going programme to characterise the residual properties and understand the failure mechanisms of in-service grey cast iron water pipes, the fatigue crack propagation behaviour of grey cast iron samples has been studied. Specimens were sourced from three ex-service pipes. For each pipe the microstructure and composition were characterised and the fracture toughness was determined. The fatigue behaviour was investigated in terms of the crack growth rate (da/dN) as a function of the applied stress intensity factor range. Clear differences in the fatigue behaviour of the samples from different pipes were observed. The result from these investigations, which indicate that microstructural differences play a role in mechanical behaviour, will support the development of asset management tools for use in the water industry
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