Dynamic damage constitutive relation of mesoscopic heterogenous brittle rock under rotation of principal stress axes |
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Authors: | XP Zhou |
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Institution: | School of Civil Engineering, Chongqing University, Chongqing 400045, PR China |
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Abstract: | A micro-mechanics-based model is developed to investigate microcrack damage mechanism of four stages of brittle rock under rotation of the principal stress axes. They consist of linear elastic, non-linear hardening, rapid stress drop and strain softening. The frictional sliding crack model is applied to analyze microcracks nucleation, propagation and coalescence. The strain energy density factor approach is applied to determine the critical condition of microcrack nucleation, propagation and coalescence. The inelastic strain increments are formulated within the framework of thermodynamics with internal variables. Rotation of principal stress axes affect the dynamic damage constitutive relationship and the failure strength of brittle rock. |
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Keywords: | Rotation of the principal stress axes Mesoscopic heterogenous brittle rock Shear deformation localization The complete stress-strain relation |
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