Strain localization and anisotropic correlations in a mesoscopic model of amorphous plasticity

Mehdi Talamali (1) , Viljo Petäjä (2) , Stéphane Roux (3) , Damien Vandembroucq (1)

1 PMMH - Physique et mécanique des milieux hétérogenes (UMR 7636)
2 SVI - Surface du Verre et Interfaces
3 LMT - Laboratoire de Mécanique et Technologie

A mesoscopic model for shear plasticity of amorphous materials in two dimensions is introduced, and studied through numerical simulations. Plastic deformation is assumed to occur through a series of local reorganizations. Using a discretization of the mechanical fields on a discrete lattice, local reorganizations are modeled as local slip events. Local yield stresses are randomly distributed in space and invariant in time. Each plastic slip event induces a long-ranged elastic stress redistribution. Most of the complex phenomenology of amorphous plasticity observed experimentally and in numerical atomistic simulations is reproduced accurately. In particular, we give a quantitative picture of localization, and of the anisotropic strain correlation both in the initial transient regime, and in the steady state.

Mots clés: plasticity; glass; amorphous

Domaines: Autre [cond-mat.other]

Mehdi Talamali, Viljo Petäjä, Stéphane Roux, Damien Vandembroucq. Strain localization and anisotropic correlations in a mesoscopic model of amorphous plasticity. 2010. ⟨hal-00483291v1⟩