Munitions Survivability Technology: A Comparison of the Effectiveness of Two Different Blanket Designs for Protecting Against an Indirect Fragment Threat

Report No. ARL-TR-2122
Authors: Boyle, Vincent M.; Bines, Alfred L.; Sutherland, William B.
Date/Pages: November 1999; 31 pages
Abstract: This report describes the results of tests comparing the ballistic effectiveness of two types of Kevlar blanket when impacted by a steel fragment weighing 0.66 lb and having a velocity of 450 ft/s. This fragment, a right circular cylinder, was used to simulate the weight and velocity of a fragment that could be generated when a stack of barricaded M107 munitions detonates and throws fragments upward; when the fragment returns to the ground, the terminal velocity for this weight and shape was calculated to be 450 ft/s. Adjacent barricaded stacks of munitions could be impacted (indirect fragment impact) and react explosively, especially if the fragment is hot However, if a ballistic blanket covered the ammunition stack, the fragment could be prevented from reaching the munitions. The tests reported here were done using room-temperature fragments. A small gas gun was designed and built to launch the fragments to the required velocity; all fragments impacted the blanket head on. Test results indicate that, for the same areal density, a 3,000-denier tight-weave blanket is more effective for stopping fragments than a l500 denier loose-weave material. Also, an eight-layer, 3,000-denier blanket having an areal density of 0.76 lb/sq ft prevented fragment penetration.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 1999