Force and flow transition in plowed granular media

Abstract

We use plate drag to study the response of granular media to localized forcing as a function of volume fraction, $\varphi$. A bifurcation in the force and flow occurs at the onset of dilatancy, ${\varphi }_c.$ Below ${\varphi }_c$ rapid fluctuations in the drag force, $F_D,$ are observed. Above ${\varphi }_c$ fluctuations in $F_D$ are periodic and increase with $\varphi$. Velocity field measurements indicate that the bifurcation in $F_D$ results from the formation of stable shear bands above ${\varphi }_c$ which are created and destroyed periodically during drag. A friction-based model captures the dynamics for $\varphi >{\varphi }_c$.

4 pages, 5 figures

References in corpus (4)

• Granular impact and the critical packing state
• Phase transition in a static granular system
• Critical packing in granular shear bands
• Unjamming due to local perturbations in granular packings with and without gravity

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