EPJ Web Conf.
Volume 140, 2017Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
|Number of page(s)||4|
|Published online||30 June 2017|
Heaping and secondary flows in sheared granular materials
1 Institute of Experimental Physics, Otto von Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany
2 Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
Published online: 30 June 2017
Split-bottom cylindrical containers are well established devices in experiments where granular materials are continuously sheared. They are characterized by localized broad shear bands. In such shear experiments, shape-anisotropic grains develop a secondary flow profile in the radial direction. A macroscopically observable consequence is the formation of a heap in the center of the container. This effect is found for all investigated types of prolate and oblate grains, but it is completely absent for spherical particles. There are qualitative differences in the behavior of short (moderate aspect ratio < 8) and long grains. The fill height of the granulate in the container considerably affects the time scale for heap formation, while the height of the heap is less dramatically influenced. Under reversal of the shear direction, the heap collapses within a few rotations, before the secondary flow in the reverse direction establishes a new heap.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.