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Force and flow transition in plowed granular media

Authors
  • Gravish, Nick
  • Umbanhowar, Paul B.
  • Goldman, Daniel I.
Type
Preprint
Publication Date
Sep 01, 2010
Submission Date
Aug 24, 2010
Identifiers
DOI: 10.1103/PhysRevLett.105.128301
Source
arXiv
License
Yellow
External links

Abstract

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

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