Non-universal Voronoi cell shapes in amorphous ellipsoid packs

F.M. Schaller; S.C. Kapfer; J.E. Hilton; P.W. Cleary; K. Mecke; C. De Michele; T. Schilling; M. Saadatfar; M. Schröter; G.W. Delaney; G.E. Schröder-Turk

doi:10.1209/0295-5075/111/24002

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Non-universal Voronoi cell shapes in amorphous ellipsoid packs

Journal article

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Non-universal Voronoi cell shapes in amorphous ellipsoid packs

F.M. Schaller, S.C. Kapfer, J.E. Hilton, P.W. Cleary, K. Mecke, C. De Michele, T. Schilling, M. Saadatfar, M. Schröter, G.W. Delaney, …

EPL (Europhysics Letters), Vol.111(2), Article 24002

2015

DOI: https://doi.org/10.1209/0295-5075/111/24002

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Abstract

In particulate systems with short-range interactions, such as granular matter or simple fluids, local structure determines the macroscopic physical properties. We analyse local structure metrics derived from the Voronoi diagram of oblate ellipsoids, for various aspect ratios and global packing fractions φg. We focus on jammed static configurations of frictional ellipsoids, obtained by tomographic imaging and by discrete element method simulations. The rescaled distribution of local packing fractions φl, defined as the ratio of particle volume and its Voronoi cell volume, is found to be independent of the particle aspect ratio, and coincide with results for sphere packs. By contrast, the typical Voronoi cell shape, quantified by the Minkowski tensor anisotropy index β = β02,0, points towards a difference between random packings of spheres and those of oblate ellipsoids. While the average cell shape β of all cells with a given value of is similar in dense and loose jammed sphere packings, the structure of dense and loose ellipsoid packings differs substantially such that this does not hold true.

Details

Title: Non-universal Voronoi cell shapes in amorphous ellipsoid packs
Authors/Creators: F.M. Schaller (Author/Creator) - Friedrich-Alexander-Universität Erlangen-Nürnberg
S.C. Kapfer (Author/Creator) - Friedrich-Alexander-Universität Erlangen-Nürnberg
J.E. Hilton (Author/Creator) - Commonwealth Scientific and Industrial Research Organisation
P.W. Cleary (Author/Creator) - Commonwealth Scientific and Industrial Research Organisation
K. Mecke (Author/Creator) - Friedrich-Alexander-Universität Erlangen-Nürnberg
C. De Michele (Author/Creator) - Sapienza University of Rome
T. Schilling (Author/Creator) - University of Luxembourg
M. Saadatfar (Author/Creator) - Australian National University
M. Schröter (Author/Creator) - Max Planck Institute for Dynamics and Self-Organization
G.W. Delaney (Author/Creator) - Commonwealth Scientific and Industrial Research Organisation
G.E. Schröder-Turk (Author/Creator) - Australian National University
Publication Details: EPL (Europhysics Letters), Vol.111(2), Article 24002
Publisher: Institute of Physics Publishing
Identifiers: 991005545414907891
Murdoch Affiliation: School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 7 Engineering & Materials Science; 7.139 Energy & Fuels; 7.139.524 Fluidization
Web Of Science research areas: Physics, Multidisciplinary
ESI research areas: Physics