Collision process of a bead on a two-dimensional bead packing: Importance of the inter-granular contacts

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 i...

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Bibliographic Details
Published in:Europhysics letters 2003-01, Vol.61 (2), p.194-200
Main Authors: Rioual, F, Valance, A, Bideau, D
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Environmental Sciences
Exact sciences and technology
Granular solids
Material form
Physics
Rheology
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Summary: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.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2003-00212-8