Turnbull, A; Crocker, L E (2006) Finite element analysis of the stress and strain associated with a corrosion pit in a cylindrical specimen under applied tensile loading. NPL Report. DEPC-MPE 034

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Abstract

A finite element analysis has been undertaken to evaluate the stress and strain distribution associated with a single corrosion pit in a cylindrical specimen stressed remotely in tension. Hemispherical and bullet-shaped pits were investigated at stresses corresponding to 90% of the 0.2 % proof stress for a steam turbine disc steel, the pit shapes reflecting, crudely, shallow and deep pits respectively. The key observation was the localisation of plastic strain to the pit walls, just below the surface of the specimen. This localisation of plastic strain correlated with recent X-ray tomography measurements suggesting that stress corrosion cracking was initiated predominantly at or just below the surface, though other factors such as the local electrode potential and chemistry could also be contributing.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	DEPC-MPE 034
Keywords:	pitting, stress corrosion cracking
Subjects:	Advanced Materials Advanced Materials > Corrosion Advanced Materials > Materials Modelling
Last Modified:	02 Feb 2018 13:15
URI:	http://eprintspublications.npl.co.uk/id/eprint/3760

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