A Computational Study of the Energy Dissipation Through an Acrylic Target Impacted by Various Size FSP

Report No. ARL-RP-251
Authors: C. G. Fountzoulas; P. G. Dehmer; J. M. Sands; J. H. Yu
Date/Pages: June 2009; 14 pages
Abstract: Recent advances in the numerical techniques, higher computing power and materials model have allowed the accurate simulation of the ballistic impact into monolithic and multi-layer transparent armor configurations. In the current effort, the velocity profile during the ballistic impact of 0.22-cal and 0.15-cal fragment simulating projectiles (FSP) into a polymethylmethacrylate (PMMA) target, which was a Plexiglas G manufactured by Atofina Chemicals was simulated using the ANSYS/AUTODYN commercial software. Our successful previous modification of the existing PMMA material model [1] resulted in accurate prediction of experimentally produced cracks and the V50 impact velocity for all cases. The energy dissipation through a monolithic and laminated acrylic target impacted by the above mentioned FSPs was studied by analyzing the simulated velocity profile of each projectile, an important design parameter. The purpose of this report is to study these profiles and to produce their analytical expressions, by using standard numerical regression techniques.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2009