Wright, L; Turnbull, A (2015) FE analysis of stress and strain localisation associated with microtopographical features in corrosion pits. NPL Report. MAT 78

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Abstract

Finite element (FE) analysis has been undertaken to quantify the distribution of stress and strain associated with corrosion pits developed experimentally in a dog-bone tensile test specimen and to compare the results with the equivalent smooth pit. The pits were generated in a carbon steel by an applied current using a capillary technique designed to simulate pits observed in a carbon steel pipeline in an oilfield environment. Pits in this system had the appearance of craters with protrusions and troughs at various locations in the pit. The FE modelling, undertaken for an applied stress of 96% sigma_y at the pit location, indicated an increase in local strain associated with the troughs, as expected, but also strain localisation adjacent to the protrusions. In the latter case the strain exceeded yield over depths of 15 µm. These topographical features could represent potential sites for crack initiation, in which context it was notable that the density and size of these features varied from one pit to another despite a similar charging current.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 78
Subjects:	Mathematics and Scientific Computing Mathematics and Scientific Computing > Modelling
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6867

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