One-Dimensional Shock and Detonation Characterization of Ultrafine Hexanitrostilbene

A series of plate impact experiments was performed, using a single-stage gas gun, on die-pressed, high density (92{\%} theoretical maximum) samples of ultrafine hexanitrostilbene (HNS). This enabled investigation of the inert shock response and subsequent detonation of the material. Shock magnitudes up to ca. 6 GPa were investigated by varying the flyer and target plate materials, and impact velocities. In each case, the shock length was chosen to be longer than the pellet (ca. 3 mm). Shock wave profiles and transit times were diagnosed using embedded miniature (1 mm$^{2})$ manganin stress gauges placed at the front and rear of the shock assemblies. The results have been interrogated to establish the non-reactive Hugoniot of the HNS and deduce information on its run-to-detonation. Analysis of measured stresses and calculated pressures suggests that pressed HNS possesses little strength behind the shock front. These and other features are discussed and compared with existing data.