Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 21: Granular Matter/Contact Dynamics
DY 21.9: Vortrag
Mittwoch, 28. März 2012, 16:30–16:45, MA 144
Jamming and Random Close Packing of Ellipsoids — •Fabian M. Schaller1, Gary W. Delaney2, Max Neudecker3, Sebastian C. Kapfer1, Klaus Mecke1, Matthias Schröter3, and Gerd E. Schröder-Turk1 — 1Institut für Theoretische Physik, Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen, Germany — 2CSIRO Mathematics, Informatics and Statistics, Clayton South, VIC 3169, Australia — 3Max-Planck-Institut für Dynamik und Selbstorganisation, Am Fassberg 17, 37077 Göttingen, Germany
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.
Additionally, we performed DEM simulations of random ellipsoid packings.
Their shape is quantified by isotropy indices βνr,s based on Minkowski tensors[1,2].
These structural data contribute to a geometric understanding why the maximal random packing fractions of ellipsoids exceed that of monodisperse spheres.
[1] G.E. Schröder-Turk et al., Disordered spherical bead packs are anisotropic, Europhys. Lett. 90, 34001 (2010)
[2] G.E. Schröder-Turk et al., Minkowski Tensor Shape Analysis of Cellular, Granular and Porous Structures, Adv. Mater. 23, 2535 (2011)