Abstract
The initiation threshold of a confined insensitive high explosive (IHE) under shaped charge attack was investigated. The composition of the ammonium perchlorate (AP) containing IHE was AP/RDX/Al/binder, 40/24/24/12 with a density of 1.80 g/cc. This IHE was designed for underwater applications. The initiation threshold was determined by measuring the running times of the reaction wave, the shock pressures, the residual penetration performance of the shaped charge jet in RHA steel plates and the fragmentation behavior of the steel casing of the IHE charge. The threshold was located very clearly due to the decrease of the reaction velocity and the increase in penetration performance of the jet with decreasing initiation stimulus. The v2d value of the threshold with 170 mm3/μs2 was rather high in comparison to conventional high explosives. This high value may be correlated with the large critical diameter of 46 mm of the IHE compared to the small jet diameter of only about 5 mm.
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