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Infinite penetration of a projectile into a granular medium
Authors:Pacheco-Vázquez F  Caballero-Robledo G A  Solano-Altamirano J M  Altshuler E  Batista-Leyva A J  Ruiz-Suárez J C
Institution:CINVESTAV-Monterrey, PIIT, Nuevo León, 66600, Mexico. fpacheco@mda.cinvestav.mx
Abstract:An object falling in a fluid reaches a terminal velocity when the drag force and its weight are balanced. Contrastingly, an object impacting into a granular medium rapidly dissipates all its energy and comes to rest always at a shallow depth. Here we study, experimentally and theoretically, the penetration dynamics of a projectile in a very long silo filled with expanded polystyrene particles. We discovered that, above a critical mass, the projectile reaches a terminal velocity and, therefore, an endless penetration.
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