2004/09/17 by Guillemette Picard, Armand Ajdari, François Lequeux +3 · 3 citations
Chemical Engineering · Engineering · Materials Science · Physics and Astronomy · #Composite material #Flow (mathematics) #Granular flow and fluidized beds #Granular material #Material Dynamics and Properties #Materials science #Mechanics #Physics #Plasticity #Rheology #Rheology and Fluid Dynamics Studies #Shear (geology) #Shear flow #Shear rate #Shear stress #Simple (philosophy) #Simple shear #Statistical physics #Stress (linguistics) #Yield (engineering) #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1103/physreve.71.010501
4 pages, 4 figures
arxiv created 2004/09/17 · openalex publication_date 2005/01/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 nonlocal elastic release of the stress these events induce in the material. A complex spatiotemporal rheological behavior 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.