Force and flow transition in plowed granular media

Nick Gravish; Paul B. Umbanhowar; Daniel I. Goldman

doi:10.1103/PhysRevLett.105.128301

Force and flow transition in plowed granular media

Nick Gravish^*, Paul B. Umbanhowar, Daniel I. Goldman

^*Corresponding author for this work

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

105 Scopus citations

Abstract

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

Original language	English (US)
Article number	128301
Journal	Physical review letters
Volume	105
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.105.128301
State	Published - Sep 16 2010

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.105.128301

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

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AU - Umbanhowar, Paul B.

AU - Goldman, Daniel I.

PY - 2010/9/16

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N2 - We use plate drag to study the response of granular media to localized forcing as a function of volume fraction I. A bifurcation in the force and flow occurs at the onset of dilatancy Ic. Below Ic rapid fluctuations in the drag force FD are observed. Above Ic fluctuations in FD are periodic and increase in magnitude with I. Velocity field measurements indicate that the bifurcation in FD results from the formation of stable shear bands above Ic which are created and destroyed periodically during drag. A friction-based wedge flow model captures the dynamics for I>Ic.

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

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Force and flow transition in plowed granular media

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