Phys. Rev. Lett. 92, 194301 (2004) [4 pages]Dynamics of Drag and Force Distributions for Projectile Impact in a Granular MediumReceived 7 November 2003; published 14 May 2004 Our experiments and molecular dynamics simulations on a projectile penetrating a two-dimensional granular medium reveal that the mean deceleration of the projectile is constant and proportional to the impact velocity. 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.194301
DOI:
10.1103/PhysRevLett.92.194301
PACS:
45.70.–n, 45.50.–j, 89.75.Da, 96.35.Gt
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