Acceleration of Flat Plates by Multiple Staging
Pressures attainable in conventional shock wave equation of state experiments are limited by the velocities to which flat plates can be accelerated without severely altering their geometry or thermodynamic state. At present two-stage gas guns provide the highest useful velocities. These can achieve approximately 8 km/s with a projectile diameter of 1.5 cm; impact of tantalum on tantalum. at this velocity yields a pressure of about 5 Mbar. These conditions thus represent the current upper limit for shock wave equation of state work in the U.S. (except in underground nuclear explosions). Russian experimenters have reported measurements with impact velocities of 14 km/s, but the technique has never been described in the open literature .
KeywordsImpact Velocity Spall Strength Impedance Ratio Flyer Plate Underground Nuclear Explosion
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