An equation of state for an explosive prior to chemical decomposition is a necessary part of an analytical model for initiation processes. In previous studies of hexanitrostilbene (HNS), a particular equation of state formulation has been used to calculate conditions in shock-compressed material, including temperatures. Measured shock Hugoniot properties were used to find values for parameters appearing in this formulation. In the present study, careful measurements of the isothermal compression of different HNS powders, together with more recent values for thermophysical constants, are used to revise the previous equation of state formulation. Approximate compaction relations for porous HNS are then used to calculate shock Hugoniot states for materials having different initial densities. The predicted states agree closely with available shock Hugoniot data. For shock pressures above 2.5 GPa, the Hugoniot curves predicted in the present study depart progressively from previous predictions. A reverse-impact experiment was conducted to measure a shocked, unreacted state at a pressure of 8.5 GPa, which is more than twice the highest Hugoniot pressure observed previously. The measured state agrees closely with the revised equation of state formulation. An important consequence of the present study is that predicted shock temperatures are much higher than previous predictions.
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Setchell et al. (1988) studied this question.
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