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

doi:10.1039/d1sm00525a

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 journal › Article › Academic › peer-review

3 Citations (Scopus)

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 language	English
Pages (from-to)	7844-7852
Number of pages	9
Journal	Soft Matter
Volume	17
Issue number	34
DOIs	https://doi.org/10.1039/d1sm00525a
Publication status	Published - 14 Sep 2021

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title = "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.",

author = "Dong Wang and Nima Nejadsadeghi and Yan Li and Shashi Shekhar and Anil Misra and Dijksman, {Joshua A.}",

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AU - Wang, Dong

AU - Nejadsadeghi, Nima

AU - Li, Yan

AU - Shekhar, Shashi

AU - Misra, Anil

AU - Dijksman, Joshua A.

PY - 2021/9/14

Y1 - 2021/9/14

N2 - 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.

AB - 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.

U2 - 10.1039/d1sm00525a

DO - 10.1039/d1sm00525a

M3 - Article

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EP - 7852

JO - Soft Matter

JF - Soft Matter

SN - 1744-6848

IS - 34

ER -

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

Abstract

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