Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 33: Poster II
DY 33.24: Poster
Donnerstag, 14. März 2013, 17:00–19:00, Poster C
Tomographic Analysis of Jammed Ellipsoid Packings — •Fabian Schaller1,2, Max Neudecker2, Mohammad Saadatfar3, Klaus Mecke1, Gerd Schröder-Turk1, and Matthias Schröter2 — 1Institut für theoretische Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 2Max-Planck-Institut für Dynamik und Selbstorganisation, Göttingen, Germany — 3Applied Maths, RSPhysSE, The Australian National University, Australia
Disordered packings of ellipsoidal particles are a generalization of disordered sphere packings that can shed light on geometric features of random close packings and structural transitions in granular matter. Here we report the structure of ellipsoid packings in terms of contact numbers and Voronoi cell shapes, for several aspect ratios. Discrete approximations of generalized Voronoi diagrams are extracted from a large number of tomographic data of ellipsoid configurations, obtained by vertical shaking. Their shape is quantified by isotropy indices βνr,s based on Minkowski tensors [1]. Contact numbers are discussed in the context of the jamming paradigm [2]. We find that our frictional particles are hyperstatic.
[1] G.E. Schröder-Turk et al., Minkowski Tensor Shape Analysis of Cellular, Granular and Porous Structures, Adv. Mater. 23, 2535 (2011)
[2] Martin van Hecke, J. Phys.: Condens. Matter (2010)