A Computational Study of Laminate Transparent Armor Impacted by FSP

Report No. ARL-RP-249
Authors: C. G. Fountzoulas; B. A. Cheeseman; P. G. Dehmer; J. M. Sands
Date/Pages: June 2009; 14 pages
Abstract: The current report reports on our efforts to simulate the ballistic impact of a fragment simulating projectile (FSP) into a Lexan 9034 polycarbonate (PC)- polymethylmethacrylate (PMMA), which was a Plexiglas G manufactured by Atofina Chemicals, - Lexan 9034 Polycarbonate laminate system, with and without the presence of polyurethane adhesive, using the nonlinear analysis software AUTODYN. The simulation results, which included V50 measurements, were compared to the ballistic results from the experiments of Hsieh et al [1], on targets consisting of 3mm PC-12mm PMMA-3mm PC impacted by 17-gr, 0.22 caliber fragment simulating projectile (FSP) at impact velocities ranging from 173, 475, 846 and 1004 m/s.

Our simulations of the impact of a 0.22-cal FSP projectile against the above laminated target showed that the existing material models were not able to reproduce the ballistic behavior of the PC-PMMA-PC target for transparent armor applications. However, the reproduction of the cracks in the PMMA and the predicted V50 impact velocity was achieved by modifying the existing material models of PMMA by adding a material strength model and a failure criterion. The necessary parameters of the chosen strength and failure models were obtained from published data. Our simulation showed that the presence of the polyurethane provide an additional resistance to penetration, as it is witnessed by the experimentation. The simulation results and the effectiveness of the modifications of the existing PMMA material models will be discussed in detail.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2009