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    Force and flow transition in plowed granular media

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    PhysRevLett.105.128301.pdf (1.232Mb)
    Date
    2010-09-06
    Author
    Gravish, Nick
    Umbanhowar, Paul B.
    Goldman, Daniel I.
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    Abstract
    We use plate drag to study the response of granular media to localized forcing as a function of volume fractionϕ. A bifurcation in the force and flow occurs at the onset of dilatancy ϕ [subscript c]. Below ϕ [subscript c] rapid fluctuations in the drag force F [subscript D] are observed. Above ϕ [subscript c] fluctuations in F [subscript D] are periodic and increase in magnitude with ϕ. Velocity field measurements indicate that the bifurcation in F [subscript D] results from the formation of stable shear bands above ϕ [subscript c] which are created and destroyed periodically during drag. A friction-based wedge flow model captures the dynamics for ϕ >ϕ [subscript c].
    URI
    http://hdl.handle.net/1853/44540
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    • Complex Rheology and Biomechanics Lab (CRAB LAB) [37]
    • Complex Rheology and Biomechanics Lab (CRAB LAB) Publications [37]

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