Abstract
When thin flyer plates are used to shock initiate high explosive (HE), any air present ahead of the flyer may cause a significant desensitization of the HE. The effect of the air in cushioning the impact of plastic flyers faced with metal films is analyzed here with MACRAME, a code which calculates wave interactions and traces wave propagation. We find that the second air shock into the HE has sufficient pressure to collapse the HE to crystal density or higher. Precompressed regions of HE do not react rapidly when the main impact pulse does arrive. Define y* as the depth where the major shock overtakes the precompression wave (for no air y*→0). For various flyers and air combinations, we compare pressure profiles at y=y*+ε. The shock pressure profile associated with metal film impact may be greatly attenuated at the depth y*. Density profiles (ρ(t) at y) show that the shock heating for y>y* is greater than that for y<y*.
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