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A novel multiscale neutron diffraction based experimental approach for granular media

Athanasopoulos, Stefanos LU ; Hall, Stephen LU and Kelleher, Joe F. (2019) In Géotechnique Letters 9(4). p.284-289
Abstract
The complexity of granular (geo-)materials is associated with the mobility and interaction of their constituent particles. Under the effect of loading, these materials exhibit a highly inhomogeneous behaviour, which might vary significantly as the loading develops (i.e. certain grain assemblies take up the load whilst other, neighbouring assemblies fall into states of lower load). To that end, understanding the (micro-)mechanisms related to the distribution and evolution of forces/stresses through granular media requires appropriate, spatially resolved measurements. Neutron strain scanning (NSS) is an experimental technique based on diffraction measurements that has been successfully used in recent years to infer force/stress distribution... (More)
The complexity of granular (geo-)materials is associated with the mobility and interaction of their constituent particles. Under the effect of loading, these materials exhibit a highly inhomogeneous behaviour, which might vary significantly as the loading develops (i.e. certain grain assemblies take up the load whilst other, neighbouring assemblies fall into states of lower load). To that end, understanding the (micro-)mechanisms related to the distribution and evolution of forces/stresses through granular media requires appropriate, spatially resolved measurements. Neutron strain scanning (NSS) is an experimental technique based on diffraction measurements that has been successfully used in recent years to infer force/stress distribution in granular materials under load, by measuring
the crystallographic strains of grains. In this work, first results from a new experimental approach involving simultaneous NSS and digital image correlation (DIC) of quartz sand under load in a specially designed plane-strain apparatus are presented. The combined use of these techniques allows the investigation of deformation mechanisms in granular media, such as sand, at different scales. Therefore, a completely novel multiscale analysis of granular (geo-)materials can be made – that is, associating the traditional macroscale measurements with the mesoscale characterisation of the strain field (through DIC) and the inferred microscale stress distribution (through NSS). (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Géotechnique Letters
volume
9
issue
4
pages
284 - 289
publisher
ICE Publishing Ltd.
external identifiers
  • scopus:85094972001
ISSN
2045-2543
DOI
10.1680/jgele.18.00234
language
English
LU publication?
yes
id
a26bbd01-4fa1-4e72-a60f-f0a558403fba
date added to LUP
2019-05-08 15:26:48
date last changed
2022-10-16 05:44:45
@article{a26bbd01-4fa1-4e72-a60f-f0a558403fba,
  abstract     = {{The complexity of granular (geo-)materials is associated with the mobility and interaction of their constituent particles. Under the effect of loading, these materials exhibit a highly inhomogeneous behaviour, which might vary significantly as the loading develops (i.e. certain grain assemblies take up the load whilst other, neighbouring assemblies fall into states of lower load). To that end, understanding the (micro-)mechanisms related to the distribution and evolution of forces/stresses through granular media requires appropriate, spatially resolved measurements. Neutron strain scanning (NSS) is an experimental technique based on diffraction measurements that has been successfully used in recent years to infer force/stress distribution in granular materials under load, by measuring<br/>the crystallographic strains of grains. In this work, first results from a new experimental approach involving simultaneous NSS and digital image correlation (DIC) of quartz sand under load in a specially designed plane-strain apparatus are presented. The combined use of these techniques allows the investigation of deformation mechanisms in granular media, such as sand, at different scales. Therefore, a completely novel multiscale analysis of granular (geo-)materials can be made – that is, associating the traditional macroscale measurements with the mesoscale characterisation of the strain field (through DIC) and the inferred microscale stress distribution (through NSS).}},
  author       = {{Athanasopoulos, Stefanos and Hall, Stephen and Kelleher, Joe F.}},
  issn         = {{2045-2543}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{284--289}},
  publisher    = {{ICE Publishing Ltd.}},
  series       = {{Géotechnique Letters}},
  title        = {{A novel multiscale neutron diffraction based experimental approach for granular media}},
  url          = {{http://dx.doi.org/10.1680/jgele.18.00234}},
  doi          = {{10.1680/jgele.18.00234}},
  volume       = {{9}},
  year         = {{2019}},
}