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

Abstract

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, κv > 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.