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Full-field measurements of strain localisation in sandstone by neutron tomography and 3D-volumetric digital image correlation

Tudisco, Erika LU ; Hall, Stephen LU ; Charalampidou, Elli Maria; Kardjilov, Nikolaj; Hilger, André and Sone, Hiroki (2015) In Physics Procedia - 10th World Conference on Neutron Radiography
Abstract
Recent studies have demonstrated that the combination of x-ray tomography during triaxial tests (”in-situ” tests) and 3D-

volumetric Digital Image Correlation (3D-DIC) can provide important insight into the mechanical behaviour and deformation

processes of granular materials such as sand. The application of these tools to investigate the mechanisms of failure in rocks is

also of obvious interest. However, the relevant applied confining pressures for triaxial testing on rocks are higher than those on

sands and therefore stronger pressure containment vessels, i.e., made of thick metal walls, are required. This makes in-situ x-ray

imaging of rock deformation during triaxial tests a challenge. One... (More)
Recent studies have demonstrated that the combination of x-ray tomography during triaxial tests (”in-situ” tests) and 3D-

volumetric Digital Image Correlation (3D-DIC) can provide important insight into the mechanical behaviour and deformation

processes of granular materials such as sand. The application of these tools to investigate the mechanisms of failure in rocks is

also of obvious interest. However, the relevant applied confining pressures for triaxial testing on rocks are higher than those on

sands and therefore stronger pressure containment vessels, i.e., made of thick metal walls, are required. This makes in-situ x-ray

imaging of rock deformation during triaxial tests a challenge. One possible solution to overcome this problem is to use neutrons,

which should better penetrate the metal-walls of the pressure vessels. In this perspective, this work assesses the capability of

neutron tomography with 3D-DIC to measure deformation fields in rock samples. Results from pre- and post-deformation neutron

tomography of a Bentheim sandstone sample deformed ex-situ at 40 MPa show that clear images of the internal structure can

be achieved and utilised for 3D-DIC analysis to reveal the details of the 3D strain field. From these results the character of the

localised deformation in the study sample can thus be described. Furthermore, comparison with analyses based on equivalent x-ray

tomography imaging of the same sample confirms the effectiveness of the method in relation to the more established x-ray based

approach. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
X-rays, Neutrons, Digital Image Correlation, Tomography, Rocks
in
Physics Procedia - 10th World Conference on Neutron Radiography
editor
Kaestner, Anders
pages
7 pages
publisher
Elsevier
external identifiers
  • Scopus:84974559550
language
English
LU publication?
yes
id
6f65b162-2498-4fd0-a31e-803ca0bacb05 (old id 7513527)
date added to LUP
2015-07-09 11:48:20
date last changed
2016-10-13 04:38:30
@misc{6f65b162-2498-4fd0-a31e-803ca0bacb05,
  abstract     = {Recent studies have demonstrated that the combination of x-ray tomography during triaxial tests (”in-situ” tests) and 3D-<br/><br>
volumetric Digital Image Correlation (3D-DIC) can provide important insight into the mechanical behaviour and deformation<br/><br>
processes of granular materials such as sand. The application of these tools to investigate the mechanisms of failure in rocks is<br/><br>
also of obvious interest. However, the relevant applied confining pressures for triaxial testing on rocks are higher than those on<br/><br>
sands and therefore stronger pressure containment vessels, i.e., made of thick metal walls, are required. This makes in-situ x-ray<br/><br>
imaging of rock deformation during triaxial tests a challenge. One possible solution to overcome this problem is to use neutrons,<br/><br>
which should better penetrate the metal-walls of the pressure vessels. In this perspective, this work assesses the capability of<br/><br>
neutron tomography with 3D-DIC to measure deformation fields in rock samples. Results from pre- and post-deformation neutron<br/><br>
tomography of a Bentheim sandstone sample deformed ex-situ at 40 MPa show that clear images of the internal structure can<br/><br>
be achieved and utilised for 3D-DIC analysis to reveal the details of the 3D strain field. From these results the character of the<br/><br>
localised deformation in the study sample can thus be described. Furthermore, comparison with analyses based on equivalent x-ray<br/><br>
tomography imaging of the same sample confirms the effectiveness of the method in relation to the more established x-ray based<br/><br>
approach.},
  author       = {Tudisco, Erika and Hall, Stephen and Charalampidou, Elli Maria and Kardjilov, Nikolaj and Hilger, André and Sone, Hiroki},
  editor       = {Kaestner, Anders},
  keyword      = {X-rays,Neutrons,Digital Image Correlation,Tomography,Rocks},
  language     = {eng},
  pages        = {7},
  publisher    = {ARRAY(0xb3a8c50)},
  series       = {Physics Procedia - 10th World Conference on Neutron Radiography},
  title        = {Full-field measurements of strain localisation in sandstone by neutron tomography and 3D-volumetric digital image correlation},
  year         = {2015},
}