Effects of shock-breakout pressure on ejection of micron-scale material from shocked tin surfaces

摘要

This effort investigates the relation between ejecta production and shock-breakout pressure (P_(SB)) for Sn shocked with a Taylor Shockwave (unsupported) to pressures near the solid-on-release/partial melt-on-release phase transition region. The Shockwaves were created by detonation of high explosive (HE) PBX-9501 on the front side of Sn coupons. Ejecta production at the backside or free side of the Sn coupons was characterized through use of piezoelectric pins, optical shadowgraphy, x-ray attenuation radiography, and optical-heterodyne velocimetry. Ejecta velocities, dynamic volume densities, and areal densities were then correlated with the shock-breakout pressure of Sn surfaces characterized by roughness average of R_a=16 μin or R_a=32 μin.