Frictional properties of bidisperse granular matter: Effect of mixing ratio

J.-C. Géminard and W. Losert
Phys. Rev. E 65, 041301 – Published 20 March 2002
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Abstract

The frictional response of granular binary mixtures to an applied shear stress is studied experimentally by sliding a rough plate across a granular surface. The static friction force is found to be up to 25% larger than a linear interpolation between the frictional properties of each component. The dynamical friction coefficient can exhibit a maximum, a minimum, or an oscillatory behavior as a function of mixing ratio, depending on the size ratio or shape of the two components. In addition, visualization of the granular flow makes it possible to show that the shear layer thickness and the characteristic shear displacement, over which a steady state dilation is reached, change linearly with the mass concentration.

  • Received 7 November 2001

DOI:https://doi.org/10.1103/PhysRevE.65.041301

©2002 American Physical Society

Authors & Affiliations

J.-C. Géminard1 and W. Losert2,*

  • 1Laboratoire de Physique de l’Ecole Normale Supérieure de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex
  • 2Physics Department, Haverford College, Haverford, Pennsylvania 19041

  • *Present address: Dept. of Physics and IPST, University of Maryland, College Park, MD 20742.

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Vol. 65, Iss. 4 — April 2002

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