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Particle rotations and energy dissipation during mechanical compression of granular materials

Zhai, C. ; Herbold, E. B. ; Hall, S. A. LU and Hurley, R. C. (2019) In Journal of the Mechanics and Physics of Solids 129. p.19-38
Abstract

We present new in-situ measurements of particle rotations and energy dissipation during compression of 3D packings of stiff, frictional particles. Two confined, uniaxial compression tests with different degrees of lateral confinement are discussed. X-ray computed tomography and 3D X-ray diffraction were combined to provide inter-particle forces, slip and roll distances, twist angles, and energy dissipation at all inter-particle contacts. Each of these measured quantities followed exponential distributions above their respective mean values and power-law distributions below their mean values in both experiments. Changes in these distributions during experiments suggest that the quantities generally became more homogeneous with increasing... (More)

We present new in-situ measurements of particle rotations and energy dissipation during compression of 3D packings of stiff, frictional particles. Two confined, uniaxial compression tests with different degrees of lateral confinement are discussed. X-ray computed tomography and 3D X-ray diffraction were combined to provide inter-particle forces, slip and roll distances, twist angles, and energy dissipation at all inter-particle contacts. Each of these measured quantities followed exponential distributions above their respective mean values and power-law distributions below their mean values in both experiments. Changes in these distributions during experiments suggest that the quantities generally became more homogeneous with increasing overall sample stress. Contact roll and slip distances, twist angles, and energy dissipation were all more heterogeneous than inter-particle normal force magnitudes in both experiments. Energy dissipation due to inter-particle slipping accounted for 95% of the total energy dissipated in both experiments. Dissipation mechanisms at inter-particle contacts bearing more than the mean normal force were responsible for approximately 70% of each sample's dissipated energy at each load step, even though these contacts constituted approximately 40% of the total number of contacts.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
3D X-ray diffraction, Energy dissipation, Granular materials, Inter-particle forces, X-ray tomography
in
Journal of the Mechanics and Physics of Solids
volume
129
pages
20 pages
publisher
Elsevier
external identifiers
  • scopus:85065191397
ISSN
0022-5096
DOI
10.1016/j.jmps.2019.04.018
language
English
LU publication?
yes
id
e96584c7-a2d0-48c4-aa93-8b6abcd93a90
date added to LUP
2019-05-20 12:10:25
date last changed
2025-04-04 14:22:16
@article{e96584c7-a2d0-48c4-aa93-8b6abcd93a90,
  abstract     = {{<p>We present new in-situ measurements of particle rotations and energy dissipation during compression of 3D packings of stiff, frictional particles. Two confined, uniaxial compression tests with different degrees of lateral confinement are discussed. X-ray computed tomography and 3D X-ray diffraction were combined to provide inter-particle forces, slip and roll distances, twist angles, and energy dissipation at all inter-particle contacts. Each of these measured quantities followed exponential distributions above their respective mean values and power-law distributions below their mean values in both experiments. Changes in these distributions during experiments suggest that the quantities generally became more homogeneous with increasing overall sample stress. Contact roll and slip distances, twist angles, and energy dissipation were all more heterogeneous than inter-particle normal force magnitudes in both experiments. Energy dissipation due to inter-particle slipping accounted for 95% of the total energy dissipated in both experiments. Dissipation mechanisms at inter-particle contacts bearing more than the mean normal force were responsible for approximately 70% of each sample's dissipated energy at each load step, even though these contacts constituted approximately 40% of the total number of contacts.</p>}},
  author       = {{Zhai, C. and Herbold, E. B. and Hall, S. A. and Hurley, R. C.}},
  issn         = {{0022-5096}},
  keywords     = {{3D X-ray diffraction; Energy dissipation; Granular materials; Inter-particle forces; X-ray tomography}},
  language     = {{eng}},
  pages        = {{19--38}},
  publisher    = {{Elsevier}},
  series       = {{Journal of the Mechanics and Physics of Solids}},
  title        = {{Particle rotations and energy dissipation during mechanical compression of granular materials}},
  url          = {{http://dx.doi.org/10.1016/j.jmps.2019.04.018}},
  doi          = {{10.1016/j.jmps.2019.04.018}},
  volume       = {{129}},
  year         = {{2019}},
}