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A discrete thermodynamic approach for anisotropic plastic-damage modeling of cohesive-frictional geomaterials

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Zhu Qizhi; Zhou C.B.; Shao Jian-Fu; Kondo Djimédo
journal (abréviation) International Journal for Numerical and Analytical Methods in Geomechanics (Int J Numer Anal Meth Geomech)
volume (numéro) 34 (12)
  
pages 1250 – 1270
résumé A discrete plastic-damage model is developed for cohesive-frictional geomaterials subjected to compression-dominated stresses. Macroscopic plastic strains of material are physically generated by frictional sliding along weakness planes. The evolution of damage is related to the evolution of weakness planes physically in connection with the propagation of microcracks. A discrete approach is used to account for anisotropic plastic flow and damage evolution, by introducing two stress invariants and one plastic hardening variable for each family of sliding weakness planes. Plastic flow in each family is coupled with damage evolution. The proposed model is applied to typical geomaterials and comparisons between numerical predictions and experimental data are presented.
mots clés plasticity • damage • induced anisotropy • discrete approach • cohesive-frictional material • microcracks
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