Session S2a: Granular Impact-Cratering Dynamics and Morphology
2:30 PM–4:18 PM, Wednesday, March 23, 2005
LACC Room: 151
Sponsoring Unit:
DCMP
Chair: Robert Behringer, Duke University
Abstract ID: BAPS.2005.MAR.S2a.1
Abstract: S2a.00001 : Dynamics of projectile impact in a two-dimensional granular medium
2:30 PM–3:06 PM
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Author:
Harry L. Swinney
(University of Texas at Austin)
Our experiments and molecular dynamics simulations on a projectile impacting a two-dimensional granular medium reveal that the average deceleration of the projectile is constant during the penetration and proportional to the impact velocity [M. Pica Ciamarra, A. H. Lara, A. T. Lee, D. I. Goldman, I. Vishik, and H. L. Swinney, Phys. Rev. Lett. 92, 194301 (2004)]. Thus the time taken for a projectile to decelerate to a stop is independent of its impact velocity. The simulations show that the probability distribution function of forces on grains is time independent during a projectile's deceleration in the medium. At all times the force distribution function decreases exponentially for large forces.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.MAR.S2a.1