Abstract
Assuming that micro-fracturing is the dominant mode of irreversible micro-structural change, the internal degradation of a brittle material is described by a set of internal variables that reflect the microcrack density and distribution. The kinetic equation for the crack evolution is written assuming the existence of a flow potential (damage surface). Predictions of the theory are compared with the microscopic and macroscopic experimental observations on rock. Also, it is shown that for a fixed crack distribution the symmetry of the stiffness tensor varies with the applied stress.
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