Towards minimal models for realistic granular materials: Tomographic analysis of bidispersed assemblies of ellipsoids
1 Institut für theoretische Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen, Germany
2 Centre for Plasmas and Fluids, Research School of Physics and Engineering, Australian National University, Canberra ACT 2601, Australia
3 School of Engineering and Information Technology, Murdoch University, Murdoch WA 6150, Australia
4 Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra ACT 2601, Australia
Published online: 30 June 2017
In this paper, we report experimental results on granular compaction in a model system made of mono- and bidisperse ellipsoidal packings as well as sand packings with grain size polydispersity. The packings are subject to vertical tapping of varying duration (number of taps) and their internal three-dimensional structure is obtained using x-ray computed tomography. Particles positions and orientations are reconstructed and the global packing densities are computed. The analysis of the vertical and horizontal local packing fraction profiles reveal a homogeneous densification in the ellipsoidal packings, however, sand packings exhibit radial density gradient, possibly linked to the onset of convection.
© The Authors, published by EDP Sciences, 2017
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