Issue 34, 2021

Rotational diffusion and rotational correlations in frictional amorphous disk packings under shear

Abstract

We show here that rotations of round particles in amorphous disk packing reveal various nontrivial microscopic features when the packing is close to rigidification. We analyze experimental measurements on disk packing subjected to simple shear deformation with various inter-particle friction coefficients and across a range of volume fractions where the system is known to stiffen. The analysis of measurements indicates that shear induces diffusive microrotation, that can be both enhanced and suppressed depending upon the volume fraction as well as the inter-particle friction. Rotations also display persistent anticorrelated motion. Spatial correlations in microrotation are observed to be directly correlated with system pressure. These observations point towards the broader mechanical relevance of collective dynamics in the rotational degree of freedom of particles.

Graphical abstract: Rotational diffusion and rotational correlations in frictional amorphous disk packings under shear

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2021
Accepted
23 Jul 2021
First published
29 Jul 2021
This article is Open Access
Creative Commons BY-NC license

Soft Matter, 2021,17, 7844-7852

Rotational diffusion and rotational correlations in frictional amorphous disk packings under shear

D. Wang, N. Nejadsadeghi, Y. Li, S. Shekhar, A. Misra and J. A. Dijksman, Soft Matter, 2021, 17, 7844 DOI: 10.1039/D1SM00525A

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