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Type: Journal article
Title: 2D modelling of inclined intergranular stress corrosion crack paths
Author: Griggs, J.
Gamboa, E.
Lavigne, O.
Citation: Fatigue and Fracture of Engineering Materials and Structures, 2017; 40(4):543-555
Publisher: Wiley Publishing
Issue Date: 2017
ISSN: 8756-758X
Statement of
J Griggs, E Gamboa and O Lavigne
Abstract: Inclined high pH stress corrosion cracking (SCC) is a type of intergranular environmen- tal cracking in gas pipelines, which differs from typical SCC by propagating at an angle from the wall direction. Investigations of Australian and Canadian inclined SCC colonies have not provided a clear indicator of a cause for the abnormal crack growth direction. This paper addresses the possibility of crack tip strain enhanced electrochemistry causing the inclination. Potentiodynamic tests were conducted to quantify the influence of strain on the electrochemistry, and strain was found to increase current density up to 300% in the SCC region. A model was developed that incorporates crack tip strain driven SCC growth, which showed good agreement with field grown cracks, and the aspect ratio of the grains was shown to have an effect on the inclination angle. The result s indicate that crack tip strain enhanced electrochemistry is a plausible cause for inclined SCC.
Keywords: Effects of strain; gas pipelines; modelling studies; polarisation response; stress corrosion cracking; X65 steel
Rights: © 2016 Wiley Publishing Ltd.
DOI: 10.1111/ffe.12514
Appears in Collections:Aurora harvest 8
Mechanical Engineering publications

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