Regensburg 2013 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Granular Matter / Contact Dynamics

DY 21.11: Talk

Wednesday, March 13, 2013, 17:45–18:00, H47

Compaction of Frictional Octahedra — •N Nirmal Thyagu, Max Neudecker, Stephan Herminghaus, and Matthias Schroeter — Max Planck Institute for Dynamics and Self-Organization, Goettingen, Germany

We perform experiments with frictional polypropylene octahedra to study the packing properties. Starting with the loose packing, compaction of octahedra is done by two types of forcing - a) tapping and b) shearing. The compaction gives rise to crystallization of octahedra due to heterogenous nucleation from the walls. We obtain the X-ray tomograms of the packing configurations as a function of packing fraction. From the contact geometries we obtain results for the packings such as - pair correlation function, distance to isostaticity, and spatial & angular correlation functions. We contrast these results with a similar study on the simplest platonic solid, the tetrahedron [Ref.1] and the sphere.

Reference: 1. Jammed frictional tetrahedra are hyperstatic, M. Neudecker, S. Ulrich, S. Herminghaus, M. Schroeter. (arXiv:1202.6272v2)