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Structure and forces in stressed 3D packings


We experimentally probe a granular system at the microscale to obtain particle positions, inter-particle contacts and the associated forces. These data are obtained by using a laser sheet scanning technique, followed by dedicated reconstruction algorithms. We then apply multiple cycles of uniaxial compression and decompression to a collection of hydrogel particles. Although the particles interact via a purely repulsive Hertzian force law, f ~ x3/2, when the particles are pushed together by a distance, x, the global force response, F, to global compression by X grows much faster than X3/2. We show that this response is due to changes in the microstructure. We find that changes in F in response to a macroscale stresss/strain are related to changes in system-wide measures of the microstructure and the inter-grain force, in addition to the increases of the forces at contacts. These data are consistent with a scaling relation that connects the observed microscopic response of the particles to the independently measured macroscopic pressure inside the packing.
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hal-01016902 , version 1 (04-10-2014)


  • HAL Id : hal-01016902 , version 1


Nicolas Brodu, Joshua Dijksman, Robert Behringer. Structure and forces in stressed 3D packings. DDS 2014 - Driven Disordered Systems, Jun 2014, Grenoble, France. ⟨hal-01016902⟩


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