Phase-field modeling of mechano-chemical-coupled stress-corrosion cracking

A mechano-chemical coupling phase-field model is proposed to investigate stress-corrosion cracking (SCC). It is demonstrated that pit-to-crack transition occurs when the relative-rate parameter, kappa(v) > 1, which characterizes the critical scenario where stress-induced degradation occurs faster than electrochemical dissolution. Moreover, an exponential relationship between the stress intensity factor and cracking velocity is revealed, and it indicates an autocatalytic process resulting from the accelerations of stress and corrosion. We provide further details regarding the variation in the electrochemical environment, effect of mechanical loading, and significant role of the initial geometry in promoting SCC. The results obtained are useful for assessing critical structures in corrosive environments. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A new mechano-chemical coupling phase-field model is proposed to investigate stress-corrosion cracking, revealing the critical scenario of pit-to-crack transition and the exponential relationship between stress intensity factor and cracking velocity. The study provides important insights into the effect of variation in the electrochemical environment, mechanical loading, and initial geometry on promoting stress-corrosion cracking and assessing critical structures in corrosive environments.