Issue
EPL
Volume 88, Number 4, November 2009
Article Number 44002
Number of page(s) 6
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/88/44002
Published online 03 December 2009
EPL, 88 (2009) 44002
DOI: 10.1209/0295-5075/88/44002

Sphere penetration by impact in a granular medium: A collisional process

A. Seguin1, Y. Bertho1, P. Gondret1 and J. Crassous2

1   Univ Paris-Sud, Univ Paris 6, CNRS, Lab FAST - Bât. 502, Campus Univ, F-91405 Orsay, France, EU
2   Institut de Physique de Rennes, UMR UR1-CNRS 6251, Université Rennes 1 - Campus Beaulieu, Bât. 11A, F-35042 Rennes, France, EU

jerome.crassous@univ-rennes1.fr

received 20 July 2009; accepted in final form 6 November 2009; published November 2009
published online 3 December 2009

Abstract
The penetration by a gravity-driven impact of a solid sphere into a granular medium is studied by two-dimensional simulations. The scaling laws observed experimentally for both the final penetration depth and the stopping time with the relevant physical parameters are here recovered numerically without the consideration of any microscopic solid friction but with dissipative collisions only. Dissipative collisional processes are thus found as essential in catching the penetration dynamics in granular matter whereas microscopic frictional processes can only be considered as secondary effects.

PACS
45.70.-n - Granular systems.
45.50.-j - Dynamics and kinematics of a particle and system of particles.
96.15.Qr - Impact phenomena.

© EPLA 2009