Turnbull, A; Crocker, L E (2011) Finite element analysis of the effect of pit shape on local stress and strain distribution. NPL Report. MAT 51

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Abstract

Previously a finite element analysis had been carried out of the stress and strain distribution associated with a single corrosion pit of both hemispherical and bullet-shaped geometry in a cylindrical specimen of a low alloy turbine disc steel stressed remotely in tension. Recent evidence had shown that 12Cr steam turbine blade steels in simulated condensate environments tended to have pit geometries that were better described as a truncated sphere with depth greater than the radius. Finite element analysis of this geometry was undertaken and the associated stress and strain distribution compared with that for a hemispherical pit of the same depth. The results confirmed the intuitive prediction that for high applied stresses the plastic strain would be even more concentrated near the pit mouth by comparison to the hemispherical pit.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 51
Keywords:	corrosion pits, finite element analysis
Subjects:	Advanced Materials Advanced Materials > Corrosion
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5230

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