INITIATION CHARACTERISTICS OF COMP-B EXPLOSIVE SUBJECT TO SHAPED CHARGE JET

Abstract

Under the development of insensitive munitions, the relationship of the diameter - velocity (dj-vj) plane of the jet and the initiation characteristics of explosives under jet impact is studied with conducting numerical simulations. It is found that under the action of jet impact, the initiation point of Comp-B explosive is concentrated at the lower right of the dj-vj plane, and the unexploded point is concentrated at the upper left of the dj-vj plane. There is an obvious boundary between the two domains. The desensitization characteristic of the precursor wave is verified, and it is proved that the vj 2dj criterion is not sufficient. It is also found that there are three different initiation modes of shelled Comp-B with jet impact. One is the impact initiation when the jet begins to penetrate the explosive, the other is the penetration initiation during jet penetration, and the third is the reflection wave initiation caused by the reflection enhancement of bow wave on the exit wall before shooting out of the target. With the increase of the barrier thickness, the three initiation modes change sequentially. Only impact initiation occurred in bare Comp-B and the gap shelled Comp-B.