Journal ArticleDOI
Discrete and continuum analysis of localised deformation in sand using X-ray mu CT and volumetric digital image correlation
Stephen Hall,Michel Bornert,Jacques Desrues,Yannick Pannier,Nicolas Lenoir,Gioacchino Viggiani,Pierre Bésuelle +6 more
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TLDR
In this paper, the onset and evolution of localised deformation processes in sand with grain-scale resolution was observed and quantified by combining state-of-the-art X-ray micro tomography imaging with 3D volumetric digital image correlation techniques.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.read more
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High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications
Veerle Cnudde,Matthieu Boone +1 more
TL;DR: A review of the principle, the advantages and limitations of X-ray CT itself are presented, together with an overview of some current applications of micro-CT in geosciences.
Journal ArticleDOI
Quantitative X-ray tomography
Eric Maire,Philip J. Withers +1 more
TL;DR: In this paper, the authors review the current state of the art as CT transforms from a qualitative diagnostic tool to a quantitative one, including the use of iterative reconstruction strategies suited to specific segmentation tasks and emerging methods that provide more insight than conventional attenuation based tomography.
Journal ArticleDOI
Grain-scale experimental investigation of localised deformation in sand: a discrete particle tracking approach
TL;DR: In this paper, the authors presented a new approach (ID-Track) for the quantification of individual grain kinematics (displacements and rotations) of large quantities of sand grains (tens of thousands) in a test sample undergoing loading.
Journal ArticleDOI
A Review of Speckle Pattern Fabrication and Assessment for Digital Image Correlation
Y.L. Dong,Bing Pan +1 more
TL;DR: In this paper, a review systematically presents the speckle pattern classification and fabrication techniques for various samples and scales, as well as some typical quality assessment metrics, considering the huge diversity in test materials, spatial scales and experimental conditions.
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Unique critical state characteristics in granular media considering fabric anisotropy
Jidong Zhao,Ning Guo +1 more
TL;DR: In this paper, a unique relationship between the mean effective stress and a fabric anisotropy parameter, defined by the first joint invariant of the deviatoric stress tensor and the deviateic fabric tensor, is found at critical state, and is path independent.
References
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Journal Article
Discrete numerical model for granular assemblies.
Peter Cundall,Otto D. L. Strack +1 more
TL;DR: The distinct element method as mentioned in this paper is a numerical model capable of describing the mechanical behavior of assemblies of discs and spheres and is based on the use of an explicit numerical scheme in which the interaction of the particles is monitored contact by contact and the motion of the objects modelled particle by particle.
Journal ArticleDOI
A discrete numerical model for granular assemblies
Peter Cundall,Otto D. L. Strack +1 more
TL;DR: The distinct element method as mentioned in this paper is a numerical model capable of describing the mechanical behavior of assemblies of discs and spheres and is based on the use of an explicit numerical scheme in which the interaction of the particles is monitored contact by contact and the motion of the objects modelled particle by particle.
Journal ArticleDOI
Applications of digital-image-correlation techniques to experimental mechanics
Journal ArticleDOI
Determination of displacements using an improved digital correlation method
TL;DR: An improved digital correlation method is presented for obtaining the full-field in-plane deformations of an object by numerically correlating a selected subset from the digitized intensity pattern of the undeformed object.
Journal ArticleDOI
The influence of strains in soil mechanics
TL;DR: In this paper, the load-deformation behavior of soils in mixed boundary value problems at model scale is discussed. But the main objective is to develop an understanding of the stress-strain behaviour of soils so that reliable predictions can be made concerning their load deformation characteristics at all working loads, rather than only loads at failure.