Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 3: Granular Matter
DY 3.7: Vortrag
Montag, 7. März 2016, 11:30–11:45, H46
Structure and Mechanics of Ellipsoid Packings — •Simon Weis1, Fabian Schaller1, Gerd Schröder-Turk2, and Matthias Schröter3 — 1Theoretische Physik 1, FAU Erlangen, Germany — 2School of Engineering and IT, Murdoch University, Australia — 3Institute for Multiscale Simulation, FAU Erlangen, Germany
Friction and adhesive forces are important parameters for the stability of granular packings. We examine the structural and mechanical properties of packings in respect to those parameters. Although friction has an impact on the mechanical characteristics, the analyzed local structural features remain unchanged.
The particles of interest are ellipsoids with two types of aspect ratios as well as spheres as a reference system. Interparticle friction is changed by grinding the particles with different abrasives as well as by applying liquid and dry lubricants, which also changes adhesive forces. The friction coefficient is measured using an inclined plane. Various packings with a range of friction coefficients are prepared using different preparation methods to obtain a range of packing fractions.
To obtain structural properties, the packings are recorded by X-ray tomography and the particles are detected. Structural characterization includes mean and local packing fractions, contact numbers as well as voronoi cell anisotropy by Minkowski tensors. The mechanical features are examined within a shear cell setup.