The stability to detonation and the expansion behavior of reaction products were studied for an aluminized explosive, HBX-1. The detonation velocity-charge diameter and detonation velocityloading density relationships were determined by streak camera techniques and electronic probe methods.These data gave reaction zone lengths which increase from 0.07 mm for an initial explosive density of 1.72 g/cm 3 to 1.5 mm. at 1.3 g/cm 3 . With the pressureparticle velocity relation established from 338,000 bars to 15 bars, and conditions in the C-J state (PCJ -220.4 kbars ) specified, the generalized hydrodynamic relations derived by Jones were used to evaluate the constants in an empirical equation of state and in the Wilkins equation of state as modified by Allan and Lambourn.
Experiments conducted at the White Oak Laboratory with a pentolite explosive charge impacted by a flat‐ended cylinder of mild steel, showed a hole drilled at the center of the impactor, if the explosive was detonated. A computer simulation was carried out with the finite element hydrocode DEFEL and the Forest‐Fire reaction‐rate model. Computed results verified the hypothesis that the annular retonation was the cause of the drilled hole. The detonation started at a distance of about 10 mm from the impact surface, then developed into an annular shape and propagated inwards and backwards, to the axis of symmetry and the impact surface. The converging wave generated a pressure of about 100 GPa near the center of its impact surface, which is believed to be the real cause of the hole.
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