Volume 61, Number 2, January 2003
|Page(s)||194 - 200|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 January 2003|
Collision process of a bead on a two-dimensional bead packing: Importance of the inter-granular contacts
Groupe Matière Condensée et Matériaux, UMR 6626, Université Rennes 1 F-35042 Rennes Cedex, France
Accepted: 5 November 2002
The collision of an impacting bead on a 2D bead packing is experimentally investigated. It is found that the energy dissipated in the collision is strongly dependent on the density of inter-granular contacts in the packing. We show indeed that the energy released by the packing after the impact is increased when the density of inter-grain contacts is lowered. This increase manifests itself by means of an important augmentation of the number of grains ejected from the packing. In addition, we propose a phenomenological description of the propagation of the shock wave (induced by the impacting bead) through the packing. This description is inspired from percolation models and provides a plausible explanation for the increase of the energy released by a packing with a low density of inter-grain contacts.
PACS: 45.70.-n – Granular systems / 62.20.-x – Mechanical properties of solids / 81.05.Rm – Porous materials; granular materials
© EDP Sciences, 2003
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