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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2005

Slow flows of yield stress fluids: complex spatio-temporal behaviour within a simple elasto-plastic model

Résumé

A minimal athermal model for the flow of dense disordered materials is proposed, based on two generic ingredients: local plastic events occuring above a microscopic yield stress, and the non-local elastic release of the stress these events induce in the material. A complex spatio-temporal rheological behaviour results, with features in line with recent experimental observations. At low shear rates, macroscopic flow actually originates from collective correlated bursts of plastic events, taking place in dynamically generated fragile zones. The related correlation length diverges algebraically at small shear rates. In confined geometries bursts occur preferentially close to the walls yielding an intermittent form of flow localization.

Dates et versions

hal-00132012 , version 1 (20-02-2007)

Identifiants

Citer

Guillemette Picard, Armand Ajdari, Francois Lequeux, Lyderic Bocquet. Slow flows of yield stress fluids: complex spatio-temporal behaviour within a simple elasto-plastic model. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2005, 71, pp.010501. ⟨10.1103/PhysRevE.71.010501⟩. ⟨hal-00132012⟩
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