Groove Charge of a Rigid Multi‐Point Initiation Explosive Network

Abstract

To improve the groove charge density and reduce the initiation synchronicity error of a multi‐point initiation explosive network, CL‐20/NC and HMX/NC polymer‐bonded explosives (PBXs) with 95 wt.% ultrafine CL‐20 or ultrafine HMX as main explosive, with 5 wt.% NC as binder, were prepared. The morphology and crystal of the two PBXs was characterized in scanning electron microscopy, X‐ray diffractometry, and Fourier‐transform infrared spectroscopy. The critical dimension for linear detonation is 0.9 mm for the CL‐20/NC PBX and 1.5 mm for the HMX/NC PBX, and with the detonation velocity of the former being 36.2 % higher than the latter. Hence, the CL‐20/NC PBX was selected as groove charge for the multi‐point initiation explosive network. An explosive network charging method is proposed that involves groove press‐loading charging with three pre‐pressed booster pellets as output end charges. This configuration increases the density of the booster charge in the grooves to 1.880 g ⋅ cm−3 (94 % of theoretical density), effectively improving the charging density consistency and lowering the network initiation synchronicity error to less than 100 ns. The rod‐shaped explosively formed projectile has a small lateral offset and good shape indicating that the synchronization of the optimized explosive network meets the requirement of a selectable shaped charge projectile.

Experimental Study of Penetration Capability of an Annular-Shaped Charge under Multipoint Synchronous Initiation

“…Both the target and annular shaped charge were supported by wooden frames, and the horizontal distance L f between them was set to be 1, 5, 10, and 15 m. Eight sets of experiments were sequentially performed: four sets with 36-point synchronous initiation, one set with 8-point synchronous initiation, one set with 16-point synchronous initiation, and two sets with 32-point synchronous initiation. A thin aluminum foil device was positioned between the target and shaped charge for speed measurement, and a synchronous device was used to maintain the initiation synchronicity error below 1 μs to minimize the efect of initiation deviation [16,17]. A schematic of the setup of the above experiments is shown in Figure 6.…”

Detection of defects in groove composite structure using a split ring resonator probe

“…Composite materials and their structures are used in aerospace, medical, and military industries. In this paper, the composite structure is described as groove composite structure, which is widely used in explosive circuits [1,2]. The groove composite structure in this paper is a non-metal plate with grooves filled with filler materials (composite materials).…”