Abstract
Based on the theory of elastoplastic mechanics, the rock elastoplastic constitutive model considering hardening/softening behavior and strain rate effect is established with the uniform strength criterion as the yield criterion. Fortran language was used to program the elastoplastic constitutive model through the user-defined material interface (Umat) of LS-DYNA. The elastoplastic constitutive model is verified by uniaxial compression test and SHPB test of rock, and the results show that the elastoplastic constitutive model can reflect the mechanical behavior of rock under quasi-static and dynamic conditions.
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