Reversibility of granular rotations and translations

Anton Peshkov, Michelle Girvan, Derek C. Richardson, and Wolfgang Losert
Phys. Rev. E 100, 042905 – Published 11 October 2019
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Abstract

We analyze reversibility of displacements and rotations of spherical grains in three-dimensional compression experiments. Using transparent acrylic beads with cylindrical holes and index matching techniques, we are not only capable of tracking displacements but also analyzing reversibility of rotations. We observe that for moderate compression amplitudes, up to one bead diameter, the translational displacements of the beads after each cycle become mostly reversible after an initial transient. By contrast, granular rotations are largely irreversible. We find a weak correlation between translational and rotational displacements, indicating that rotational reversibility depends on more subtle changes in contact distributions and contact forces between grains compared with displacement reversibility. Three-dimensional rotations in dense granular systems are particularly important, since frictional losses associated with rotations are the dominant mechanism for energy dissipation. As such our work provides a first step toward a thorough study of rotations and tangential forces to understand the granular dynamics in dense systems.

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  • Received 2 November 2018
  • Revised 28 March 2019

DOI:https://doi.org/10.1103/PhysRevE.100.042905

©2019 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft Matter

Authors & Affiliations

Anton Peshkov1, Michelle Girvan2, Derek C. Richardson3, and Wolfgang Losert2

  • 1IREAP, University of Maryland, College Park, Maryland 20742, USA
  • 2Department of Physics, IPST and IREAP, University of Maryland, College Park, Maryland 20742, USA
  • 3Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA

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Issue

Vol. 100, Iss. 4 — October 2019

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