Measurement of explosion time as a function of temperature for PBX 9501

摘要

We report measurements of the surface temperature from confined PBX 9501 subject to impact in the range 0.5-1 GPa. The temperatures were obtained by IR radiometry with 80 mum and 1 mus spatial and temporal resolution, respectively. Two distinct types of experiment are reported. In one the shock was coupled into the sample through a sharp edged, shearing impactor, resulting in high, localized temperatures in the sheared boundary of the explosive. In the second a planar shock was used, and SiC particulate was spread uniformly across the explosive to induce frictional heating. Very high, uniformly distributed surface temperatures were observed in this case. In both types of eperiment the temperature profile as a function of time exhibits a sharp rise, followed by a constant induction period and localized ignition. The measured inductiont ime and temperature compare favorably with that predicted by the thermal decomposition model of HMX proposed by McGuire and Tarver.