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We study a class of time evolution models that contain dissipation mech-anisms exhibited by geophysical materials during deformation: plasticity,viscous dissipation and fracture. We formally prove that they satisfy aClausius-Duhem type inequality. We describe a semi-discrete time evolu- tionassociated with these models, and report numerical 1D and 2D tractionexperiments, that illustrate that several dissipation regimes can indeed takeplace during the deformation. Finally, we report 2D numerical simulation of anexperiment by Peltzer and Tapponnier, who studied the indentation of a layer ofplasticine as an analogue model for geological materials.

Numerical simulation of a class of models that combine several mechanisms of dissipation: fracture, plasticity, viscous dissipation