Regensburg 2010 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 13: Granular Matter/ Contact Dynamics II
DY 13.10: Talk
Wednesday, March 24, 2010, 12:00–12:15, H47
Local Anisotropy in jammed spherical bead packs — •Gerd E. Schröder-Turk1, Walter Mickel1, Mohammad Saadatfar2, Tim Senden2, Matthias Schröter3, Gary Delaney4, Klaus Mecke1, and Tomaso Aste5 — 1Theoretische Physik, Friedrich-Alexander Universität Erlangen-Nürnberg, Staudtstr. 7B, 91058 Erlangen — 2Applied Maths, School of Physics, The Australian National University, 0200 ACT, Canberra, Australia — 3Center for Nonlinear Dynamics and Dept. of Physics, University of Texas, Austin, TX 78712, USA — 4CSIRO Mathematical and Information Sciences, Private Bag 33, Clayton South, VIC, 3168, Australia — 5School of Physical Sciences, University of Kent, Canterbury, Kent, CT2 7NH, UK
We report significant structural anisotropy in disordered mono-disperse bead packs manifest in the shape of the Voronoi cells. This result is based on an analysis of several experimental and simulated packings. The anisotropy of the Voronoi cell shape is characterized by a robust method based on tensorial Minkowski functionals. The degree of anisotropy is found to decrease with increasing packing fraction φ for 0.55≤ φ ≤ 0.64 and to be insensitive to packing details and protocols. We observe a distinct change in the trend of the anisotropy when φ becomes larger than 0.64 and also when the system passes from unjammed to jammed configurations. The anisotropy of the Voronoi cell shape is a packing effect without significant alignment with the vertical or horizontal axes.