Dynamic Tensile Extrusion of 0.25 and 0.30 Caliber Hypervelocity Projectiles

Abstract Introduction An electrothermal (ET) laboratory gun capable of firing small cylindrical projectiles at hyper-velocities has been developed. [1-4] Such compact laboratory devices have significant potential for subscale material analysis. The ET gun allows high-throughput data acquisition in a controlled environment. A material response evaluation technique known as dynamic tensile extrusion (DTE) is one means to further increase the velocity of a moving projectile.[5] DTE is an experimental technique used to explore material response in tension under high strains and high strain rates as a spherical or hemispherical nose specimen passes through a conical reducing die. [6] Given a sufficient initial velocity, intense pressure is generated in the specimen as it impacts the die allowing the material to flow and results in a velocity enhancement at the front of the specimen.