Abstract
Classical fracture mechanics postulates that the crack propagates dynamically when the stress intensity factor reaches a critical level, that is, fracture toughness [1]. However, the crack can propagate slowly even when the stress intensity factor is less than the critical level. This phenomenon is called subcritical crack growth, and the main mechanism of subcritical crack growth is stress corrosion [2]. Subcritical crack growth is one of the main causes of timedependent behavior in rocks. It has been shown that subcritical crack growth in rocks under air condition is facilitated by water vapour pressure [3]. In this study, subcritical crack growth in rocks under water environment is investigated.
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