Strain localization and anisotropic correlations in a mesoscopic model of amorphous plasticity - 10/05/12
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Abstract |
A mesoscopic model for shear plasticity of amorphous materials in two dimensions is introduced, and studied through numerical simulations in order to elucidate the macroscopic (large scale) mechanical behavior. 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 an Eshelby-like long-ranged elastic stress redistribution. Focusing on quasi-static loadings and zero-temperature limit, extremal dynamics allows for recovering many of the complex features of amorphous plasticity observed experimentally and in numerical atomistic simulations in the quasi-static regime. In particular, a quantitative picture of localization, and of the anisotropic strain correlation both in the initial transient regime, and in the steady state are provided.
Le texte complet de cet article est disponible en PDF.Keywords : Amorphous plasticity, Mesoscopic model, Plastic deformation
Plan
Vol 340 - N° 4-5
P. 275-288 - avril 2012 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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