Abstract
A reactive hot spot concept was investigated for fine fragmentation of a structural reactive material (SRM) solid under explosive loading to augment air blast through rapid reaction of fine SRM fragments. Micro-sized MoO3 particles were distributed in a particulate aluminum base in 10Al + MoO3, which was consolidated into a full-density solid. The SRM solid was made of a thick-walled cylindrical casing containing a high explosive. Intermetallic reactions of micro-sized MoO3 and nearby Al under explosive loading created heat and gas products to form microscale hot spots that initiated local fractures leading to fine fragments of the rest of Al. Experiments in a cylindrical chamber demonstrated the presence of a large amount of fine Al fragments, whose prompt reaction after detonation significantly enhanced the primary and near-field blast wave, thus verifying the concept.
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