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|Title:||2D modelling of inclined intergranular stress corrosion crack paths|
|Citation:||Fatigue and Fracture of Engineering Materials and Structures, 2017; 40(4):543-555|
|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.|
|Appears in Collections:||Aurora harvest 8|
Mechanical Engineering publications
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