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Measuring Force-Chains in Opaque Granular Matter Under Shear

Marteau, Eloïse and Andrade, José E. (2017) Measuring Force-Chains in Opaque Granular Matter Under Shear. In: Bifurcation and Degradation of Geomaterials with Engineering Applications. Springer Series in Geomechanics and Geoengineering. Springer , Cham, Switzerland, pp. 441-444. ISBN 978-3-319-56396-1.

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Microstructural information, such as inter-particle forces and particle kinematics, plays a key role in understanding the continuum behavior of complex granular structure. Although micromechanical techniques have provided tremendous insights, they still lack quantitative accuracy and, associated with this, capacity to predict macroscopic behavior. We report here a set of experiments performed on a novel mechanical device in which we have successfully extracted particle-scale kinematics and inter-particle forces in a two-dimensional idealized granular assembly. This mechanical device allows a specimen composed of a two-dimensional analogue granular assembly to be subjected to quasi-static shear conditions over large deformation. Digital Image Correlation (DIC) is employed to measure particle kinematics. The inter-particle forces are inferred using the Granular Element Method (GEM), provided that average particle strains are measured and that the location of the contact points in the array is known. DIC combined with GEM allow us to observe and assess the force distribution in the complex granular assembly. These results represent an important step in our understanding of the micromechanical response of a complex granular assembly to applied macroscopic strains and stresses.

Item Type:Book Section
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Additional Information:© 2017 Springer International Publishing AG. First Online: 22 April 2017.
Series Name:Springer Series in Geomechanics and Geoengineering
Record Number:CaltechAUTHORS:20170711-100646839
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78934
Deposited By: Tony Diaz
Deposited On:11 Jul 2017 22:06
Last Modified:15 Nov 2021 17:44

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