CTH Analyses of Fragment Penetration Through Heat Sink Fins

Report No. ARL-TR-3535
Authors: Anand Prakash (ARL)
Date/Pages: June 2005; 29 pages
Abstract: Vulnerability/lethality analysis codes (e.g., MUVES-S2) generally use the FATEPEN (fast air target encounter penetration) and THOR penetration models to determine damage produced by impacts of fragments. For simple impact scenarios, e.g., normal fragment impact on monolithic plates, these two models give reasonable predictions for penetration, perforation, and residual velocity. It is, however, not clear how realistic the predictions of these models are for more complicated scenarios. This report presents more detailed calculations of the penetration and perforation of an electronic box with cooling fins by a high velocity fragment that strikes the fins with an oblique impact. We do this by conducting physics-based, three-dimensional, numerical simulations with the CTH finite difference code. It is found that the presence of fins significantly reduces the residual velocity of the fragment. Predictions of CTH for oblique impact on plain walls are also compared with those from FATEPEN and THOR.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2005