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Finite element analysis of stress distribution around corrosion pit in shot-peened steel.

Turnbull, A; Crocker, L E (2016) Finite element analysis of stress distribution around corrosion pit in shot-peened steel. NPL Report. MAT 81

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Abstract

Finite element analysis has been applied to chacterise the stress and strain distribution around a corrosion pit in a steam turbine martensitic stainless steel that had been shot- peened according to industry practice. The stress and strain distribution around the pit has been evaluated step-wise, initially with an applied design stress of 90% s0.2 only, with compressive residual stress gradient only, and finally with a combination of applied and residual stress. In the case of compressive residual stress only s there was a concentration of that stress around the pit but it was not possible to decouple the stress concentration effect from any relaxation that might have ensued.The most obvious, and expected, impact of the compressive stress gradient was to shift the maximum in strain away from the pit mouth (applied stress only case) to the pit base. The compressive stress was also effective in limiting the magnitude of stress and strain at the pit base when the pit was small but at a pit depth of about 150 µm or greater the influence was less and certainly at a depth of 250 µm the stress and strain would be such as to pose a risk of stress corrosion cracking of shot-peened steel if exposed to a sufficiently aggressive environment.

Item Type: Report/Guide (NPL Report)
NPL Report No.: MAT 81
Keywords: residual stress, shot-peening, finite element analysis
Subjects: Advanced Materials
Advanced Materials > Corrosion
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7090

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