Discrete and continuum analysis of localised deformation in sand using X-ray μCT and volumetric digital image correlation
Top Cited Papers
- 1 May 2010
- journal article
- research article
- Published by Thomas Telford Ltd. in Géotechnique
- Vol. 60 (5), 315-322
- https://doi.org/10.1680/geot.2010.60.5.315
Abstract
The objective of this work was to observe and quantify the onset and evolution of localised deformation processes in sand with grain-scale resolution. The key element of the proposed approach is combining state-of-the-art X-ray micro tomography imaging with three-dimensional volumetric digital image correlation techniques. This allows not only the grain-scale details of a deforming sand specimen to be viewed, but also, and more importantly, the evolving three-dimensional displacement and strain fields throughout loading to be assessed. X-ray imaging and digital image correlation have been in the past applied individually to study sand deformation, but the combination of these two methods to study the kinematics of shear band formation at the grain scale is the first novel aspect of this work. Moreover, the authors have developed a completely original grain-scale volumetric digital image correlation method that permits the characterisation of the full kinematics (i.e. three-dimensional displacements and rotations) of all the individual sand grains in a specimen. The results obtained using the discrete volumetric digital image correlation confirm the importance of grain rotations associated with strain localisation.Keywords
This publication has 23 references indexed in Scilit:
- Localised deformation patterning in 2D granular materials revealed by digital image correlationGranular Matter, 2009
- Methods and applications of digital volume correlationThe Journal of Strain Analysis for Engineering Design, 2008
- A methodology for 7D warping and deformation monitoring using time-lapse seismic dataGeophysics, 2006
- Strain localization in sand: an overview of the experimental results obtained in Grenoble using stereophotogrammetryInternational Journal for Numerical and Analytical Methods in Geomechanics, 2004
- Assessment of Localized Deformations in Sand Using X-Ray Computed TomographyGeotechnical Testing Journal, 2000
- Digital volume correlation: Three-dimensional strain mapping using X-ray tomographyExperimental Mechanics, 1999
- Void ratio evolution inside shear bands in triaxial sand specimens studied by computed tomographyGéotechnique, 1996
- Triaxial Testing of Granular Soil Under Elevated Cell PressurePublished by ASTM International ,1988
- Applications of digital-image-correlation techniques to experimental mechanicsExperimental Mechanics, 1985
- A discrete numerical model for granular assembliesGéotechnique, 1979