Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 68: Poster: Complex Fluids, Glasses, Granular
DY 68.1: Poster
Donnerstag, 15. März 2018, 15:30–18:00, Poster A
Shape, Friction and Cohesion in Granular Packings — •Simon Weis1, Gerd Schröder-Turk1,2, and Matthias Schröter3 — 1Theoretische Physik1, FAU Erlangen, Germany — 2School of Engineering and IT, Murdoch University, Australia — 3Institute of Multiscale Simulations, FAU Erlangen, Germany
Friction and adhesive forces are important parameters for the stability of granular packings. We analyze packings of wetting and non wetting spheres of different sizes and triaxial ellipsoids with different aspect ratios. The structural properties of packings are analyzed with respect to the particle's shape, their friction and adhesive forces. Interparticle friction is changed by grinding the particles with different abrasives and by applying liquid and dry lubricants, which also changes adhesive forces. Adhesive forces are changed by adding water with a surfactant to the packing. Various packings with a range of friction coefficients and liquid contents are prepared at various packing fractions by vertical tapping.
To obtain structural properties, the packings are recorded by X-ray tomography and particles as well as liquid clusters are detected. Structural characterization includes mean and local packing fractions, contact numbers as well as (Set-)Voronoi cell anisotropy by Minkowski tensors.
We show that, although friction has an impact on the mechanical characteristics, the analyzed local structural features remain unchanged. The effect of adhesive forces correlates with particle size.