| Issue |
EPJ Web Conf.
Volume 140, 2017
Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
|
|
|---|---|---|
| Article Number | 02024 | |
| Number of page(s) | 4 | |
| Section | Granular solids | |
| DOI | https://doi.org/10.1051/epjconf/201714002024 | |
| Published online | 30 June 2017 | |
https://doi.org/10.1051/epjconf/201714002024
An experimental investigation of the force network ensemble
Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA
* e-mail: jekollme@ncsu.edu
Published online: 30 June 2017
We present an experiment in which a horizontal quasi-2D granular system with a fixed neighbor network is cyclically compressed and decompressed over 1000 cycles. We remove basal friction by floating the particles on a thin air cushion, so that particles only interact in-plane. As expected for a granular system, the applied load is not distributed uniformly, but is instead concentrated in force chains which form a network throughout the system. To visualize the structure of these networks, we use particles made from photoelastic material. The experimental setup and a new data-processing pipeline allow us to map out the evolution subject to the cyclic compressions. We characterize several statistical properties of the packing, including the probability density function of the contact force, and compare them with theoretical and numerical predictions from the force network ensemble theory.
© The Authors, published by EDP Sciences, 2017
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