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

Dong Wang, Nima Nejadsadeghi, Yan Li, Shashi Shekhar*, Anil Misra, Joshua A. Dijksman

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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.

Original languageEnglish
Pages (from-to)7844-7852
Number of pages9
JournalSoft Matter
Volume17
Issue number34
DOIs
Publication statusPublished - 14 Sep 2021

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