Local rheological measurements in the granular flow around an intruder

Abstract

The rheological properties of granular matter within a two-dimensional flow around a moving disk is investigated experimentally. Using a combination of photoelastic and standard tessellation techniques, the strain and stress tensors are estimated at the grain scale in the time-averaged flow field around a large disk pulled at constant velocity in an assembly of smaller disks. On the one hand, one observes inhomogeneous shear rate and strongly localized shear stress and pressure fields. On the other hand, a significant dilation rate, which has the same magnitude as the shear strain rate, is reported. Significant deviations are observed with local rheology that justify the need of searching for a non-local rheology.

7 pages, 9 figures

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Cited by in corpus (15)

• Analysis of granular rheology in a quasi-two-dimensional slow flow by means of discrete element method based simulations
• Yield Stress and Compliance in Active Cell Monolayers
• Rheology of dense granular flows in two dimensions: Comparison of fully two-dimensional flows to unidirectional shear flow
• Intruder in a two-dimensional granular system: Effects of dynamic and static basal friction on stick-slip and clogging dynamics
• Dynamics of a grain-scale intruder in a two-dimensional granular medium with and without basal friction
• Bending transition in the penetration of a flexible intruder in a 2D dense granular medium
• Cooperative effects induced by intruders evolving through a granular medium
• Contacts, motion and chain-breaking in a two-dimensional granular system displaced by an intruder
• Stress propagation in locally loaded packings of disks and pentagons
• Collaborative behavior of intruders moving amid grains
• Intruder in a two-dimensional granular system: statics and dynamics of force networks in an experimental system experiencing stick-slip dynamics
• Drag reduction during the side-by-side motion of a pair of intruders in a granular medium
• Reorganization of a granular medium around a localized transformation
• Undulatory forcing of an intruder through granular media: effects of frequency and packing fraction
• Intruder dynamics in granular media under localized surface loading