Studies in a 2D granular pure shear experiment

ORAL

Abstract

We have performed two dimensional granular experiments under pure shear using bidisperse photo-elastic disks. Starting from a stress free state, a squre box filled with granular particles is subject to shear. The forward shear involved thirty steps, leading to maximum strain of 0.1. The network of force chains gradually built up as the strain increased, leading to increased pressure and shear stress. Backward shear was then applied to return the system to zero strain in the next thirty steps. Following each change of the system, contact forces of individual disks were measured by applying an inverse algorithm. We also kept track of the displacement and angle of rotation of every particle from frame to frame. We present the results for the contact forces, particle displacement, particle rotations, fabric, etc. Work supported by NSF grant DMR0555431.

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Authors

  • Jie Zhang

    • Department of Physics and CNCS, Duke University, NC 27708, USA
    • Department of Physics and Center for Nonlinear and Complex Systems, Duke University, NC 27708, USA

  • Peidong Yu

    • Department of Physics and Center for Nonlinear and Complex Systems, Duke University, NC 27708, USA

  • Trush Majmudar

    • Department of Mechanical Engineering, MIT, Boston 02139, USA

  • R.P. Behringer

    • Physics Department, Duke University
    • Department of Physics and CNCS, Duke University, Durham, NC 27708, USA
    • Dept. of Physics, Duke Univ.
    • Duke University
    • Department of Mechanical Engineering, MIT, Boston 02139, USA