De heer Mohamad Hasan : Deposition and shaking of dry granular piles. A Granular Dynamics model for reversible transitions between stick and slip contact

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6 Oct 2003 13:30
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr. J. Grasman (Mathematical an Statistical Methods)prof.dr.ir. G.P.A. Bot (Technical Physics)
Co Promotor: dr. J.H.J. van Opheusden

 A friction force model describing reversible stick-slip transition during contact has been developed to simulate the deposition and shaking of granular materials on a free surface or in a container. At the end of the deposition process a stable pile is formed. For two and three-dimensional systems the shape and internal structure of the deposited piles are highly different. In 2D there is a large-scale internal motion, that can be characterized as landslides. In 3D there are no landslides, but small internal shifts in a loosely random stacked conical pile. In both 2D and 3D surface avalanches are observed. Under horizontal or vertical shaking a stable pile of granular material on the free surface collapses. Shaking the pile in the container induces convection, which gives mixing, and compaction. High densities can be obtained with an annealing procedure in which the intensity of shaking is increased and next is slowly decreased.
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