Initiation of secondary explosives measured using embedded electromagneticgauges

摘要

There is considerable evidence that secondary explosive materials having arelatively large (10-12%) proportion of HTPB binder do not exhibit DDT undercook-off. However, the understanding of the mechanisms controlling the growth ofreaction in such experiments is incomplete. Most importantly, it is not knownwhether a mechanistic reason exists to preclude DDT; it is possible thatexisting techniques to explore cook-off simply do not offer the correctconditions to allow DDT to occur. We present experiments in which impacts weremade against a RDX/HTPB PBX using a single-stage light gas gun. Electromagneticparticle velocity gauges were embedded within the targets at different distancesfrom the impact face to record the onset of reaction, and in some casesdetonation. These experiments were also performed against RDX/TNT targets. Thetime-resolved particle velocity histories have allowed comparison of some of thefactors governing growth of reaction, and have provided run-to-detonationdistance data for different impact stresses.