CUED Publications database

Mapping forces in a 3D elastic assembly of grains

Saadatfar, M and Sheppard, AP and Senden, TJ and Kabla, AJ (2012) Mapping forces in a 3D elastic assembly of grains. Journal of the Mechanics and Physics of Solids, 60. pp. 55-66. ISSN 0022-5096

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Abstract

Our understanding of the elasticity and rheology of disordered materials, such as granular piles, foams, emulsions or dense suspensions relies on improving experimental tools to characterise their behaviour at the particle scale. While 2D observations are now routinely carried out in laboratories, 3D measurements remain a challenge. In this paper, we use a simple model system, a packing of soft elastic spheres, to illustrate the capability of X-ray microtomography to characterise the internal structure and local behaviour of granular systems. Image analysis techniques can resolve grain positions, shapes and contact areas; this is used to investigate the materials microstructure and its evolution upon strain. In addition to morphological measurements, we develop a technique to quantify contact forces and estimate the internal stress tensor. As will be illustrated in this paper, this opens the door to a broad array of static and dynamical measurements in 3D disordered systems. © 2011 Elsevier Ltd. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 3D image processing Force measurement Granular matter Segmentation Tomography
Subjects: UNSPECIFIED
Divisions: Div C > Biomechanics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:26
Last Modified: 08 Dec 2014 02:10
DOI: 10.1016/j.jmps.2011.10.001