Abstract
When low porosity rock samples are loaded beyond a certain threshold, microcracking occurs. This threshold can be seen as a yielding condition in an elasto-plastic model, or as a damage initiation criterion in an internal state variable constitutive model. In this paper, the authors present a simple multiaxial formulation used to describe this threshold in the conventional stress space. The criterion is applied to a hard rock (granite) and to a soft rock (rocksalt), and its significance is discussed.
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