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Three-dimensional experimental granular mechanics

Hall, S. A. LU and Wright, J. (2015) In Geotechnique Letters 5(4). p.236-242
Abstract

Results are presented from a new method for experimental analysis of the mechanics of real granular materials in three dimensions. The method involves a combination of X-ray tomography and three- dimensional (3D) X-ray diffraction to provide the grain-scale structural evolution (grain positions and kinematics, grain-contact distributions and grain-grain contact fracture) simultaneously with the tensor strains of each of the individual grains, while performing mechanical testing on a granular assembly. Using this approach, force chains can be identified in three dimensions as continuous lines of load-carrying (strained) grains. Furthermore, the identified load distribution can be considered as a separation and organisation of ‘carriers’... (More)

Results are presented from a new method for experimental analysis of the mechanics of real granular materials in three dimensions. The method involves a combination of X-ray tomography and three- dimensional (3D) X-ray diffraction to provide the grain-scale structural evolution (grain positions and kinematics, grain-contact distributions and grain-grain contact fracture) simultaneously with the tensor strains of each of the individual grains, while performing mechanical testing on a granular assembly. Using this approach, force chains can be identified in three dimensions as continuous lines of load-carrying (strained) grains. Furthermore, the identified load distribution can be considered as a separation and organisation of ‘carriers’ (grains experiencing significant strain) and ‘non-carriers’ (grains carrying little or no load), which is characterised by the use of the Gini coefficient, borrowed from economic statistics. Correspondences are thus identified between the macroscopic stiffness of the granular assembly and both the evolution of granular strains and the distribution of the main load carriers.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Laboratory tests, Particle-scale behaviour
in
Geotechnique Letters
volume
5
issue
4
pages
7 pages
publisher
ICE Publishing Ltd.
external identifiers
  • scopus:84983158330
ISSN
2045-2543
DOI
10.1680/jgele.15.00094
language
English
LU publication?
yes
id
c63bac46-e866-4740-96d2-8acb7f37d55f
date added to LUP
2016-12-22 13:06:16
date last changed
2017-09-10 05:13:34
@article{c63bac46-e866-4740-96d2-8acb7f37d55f,
  abstract     = {<p>Results are presented from a new method for experimental analysis of the mechanics of real granular materials in three dimensions. The method involves a combination of X-ray tomography and three- dimensional (3D) X-ray diffraction to provide the grain-scale structural evolution (grain positions and kinematics, grain-contact distributions and grain-grain contact fracture) simultaneously with the tensor strains of each of the individual grains, while performing mechanical testing on a granular assembly. Using this approach, force chains can be identified in three dimensions as continuous lines of load-carrying (strained) grains. Furthermore, the identified load distribution can be considered as a separation and organisation of ‘carriers’ (grains experiencing significant strain) and ‘non-carriers’ (grains carrying little or no load), which is characterised by the use of the Gini coefficient, borrowed from economic statistics. Correspondences are thus identified between the macroscopic stiffness of the granular assembly and both the evolution of granular strains and the distribution of the main load carriers.</p>},
  author       = {Hall, S. A. and Wright, J.},
  issn         = {2045-2543},
  keyword      = {Laboratory tests,Particle-scale behaviour},
  language     = {eng},
  month        = {12},
  number       = {4},
  pages        = {236--242},
  publisher    = {ICE Publishing Ltd.},
  series       = {Geotechnique Letters},
  title        = {Three-dimensional experimental granular mechanics},
  url          = {http://dx.doi.org/10.1680/jgele.15.00094},
  volume       = {5},
  year         = {2015},
}