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Homogenization-Based Poroplasticity Damage Formulations for Cohesive-Frictional Geomaterials
A combined homogenization/thermodynamics framework is presented for constitutive modelling of friction-induced inelastic deformation and damage by microcracking as well as their coupling with the effect of pore pressure for microcracked solids. The key for thermodynamic formulations of the cracked system weakened by pores is to determine the free energy and then a complementary energy by a transformation of the former. It is shown that the pore pressure is involved in both the macroscopic stress and the local stress. A Coulomb-type friction criterion function of this local stress and a strain-energy release rate-based damage criterion are adopted respectively for describing evolution of inelastic deformation and damage propagation. The proposed unified model contains a back-stress hardening/softening term. The number of parameters in the current model can be largely reduced when compared with phenomenological models.
Homogenization-Based Poroplasticity Damage Formulations for Cohesive-Frictional Geomaterials
A combined homogenization/thermodynamics framework is presented for constitutive modelling of friction-induced inelastic deformation and damage by microcracking as well as their coupling with the effect of pore pressure for microcracked solids. The key for thermodynamic formulations of the cracked system weakened by pores is to determine the free energy and then a complementary energy by a transformation of the former. It is shown that the pore pressure is involved in both the macroscopic stress and the local stress. A Coulomb-type friction criterion function of this local stress and a strain-energy release rate-based damage criterion are adopted respectively for describing evolution of inelastic deformation and damage propagation. The proposed unified model contains a back-stress hardening/softening term. The number of parameters in the current model can be largely reduced when compared with phenomenological models.
Homogenization-Based Poroplasticity Damage Formulations for Cohesive-Frictional Geomaterials
Zhu, Qi-zhi (Autor:in) / Shao, Jian-fu (Autor:in) / Xie, Ni (Autor:in)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 1732-1735
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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