Projectile Deceleration for Perforation through Layers of Un-reinforced Concrete Targets
Mr. Jeff Averett, US Army Engineer Research and Development Center
Dr. Donald Cargile, US Army Engineer Research and Development Center
Mr. John Foster, Sandia National Laboratories
Dr. Vincent Luk, Sandia National Laboratories

Abstract:
During penetration and perforation the resisting target forces result in projectile deceleration.  The perforation resistance and resulting deceleration are influenced by the proximity of the projectile/target exit or layer interface.   As the projectile nears the exit surface of a concrete slab the material ahead of the projectile begins to break-up, may become ejected from the target, and loses resistance to penetration.  Experiments using projectiles instrumented with linear acceleration data recorders provide information on the loads to the projectile during the penetration event.  In this paper, the results from previous experiments into thick concrete targets are combined with the results from recent experiments into layers of thinner targets to address the influence of an interface or free surface on the deceleration of the projectile.  All targets were un-reinforced.  The results are then compared to numerical simulations.

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