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    Entangled granular media

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    PhysRevLett.108.208001.pdf (865.0Kb)
    Date
    2012-05-17
    Author
    Gravish, Nick
    Franklin, Scott V.
    Hu, David L.
    Goldman, Daniel I.
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    Abstract
    We study the geometrically induced cohesion of ensembles of granular“u particles” that mechanically entangle through particle interpenetration. We vary the length-to-width ratio l/w of the u particles and form them into freestanding vertical columns. In a laboratory experiment, we monitor the response of the columns to sinusoidal vibration (with peak acceleration Γ). Column collapse occurs in a characteristic time τ which follows the relationτ∝exp(Γ/Δ). Δ resembles an activation energy and is maximal at intermediate l/w. A simulation reveals that optimal strength results from competition between packing and entanglement
    URI
    http://hdl.handle.net/1853/44537
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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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