活性/金属串联爆炸成型弹丸侵爆耦合毁伤行为

In order to improve the comprehensive damage effects of the explosively formed projectile (EFP) to the target, a shaped charge structure with reactive/ metal composite spherical liners is proposed. The composite liners include an inner copper liner and an outer reactive liner, and the outer reactive liner is prepared by PTFE/ Al energetic powder with a mass ratio of 73. 5% /26. 5% through cold pressing and sintering processes. The combined damage behavior of penetration and blast of the reactive/ metal tandem EFPs for the spaced target plates is investigated by static explosion experiments. The results show that the reactive/ metal tandem EFPs not only have an effective penetration effect on the spaced target plates, but also generate detonation-like reaction among the plates, improving the damage effects on the target plates. The number of penetrated layers and perforation diameter of the plates damaged by the reactive/ metal tandem EFPs are significantly influenced by the plate thickness. As the thickness of the first two layers of the spaced target plates increases from 10 mm to 20 mm, the total number of penetrated layers decreases from 6 to 3, and the perforation diameter also significantly reduces. By adopting the SPH algorithm, the numerical simulation reveals that the reactive / metal composite liners form a composite penetrator with a copper EFP in front and a reactive EFP partially embedded in the precursor copper EFP. Then, through the introduction of reaction delay time and material model transformation, the numerical simulations further reveal that the detonation-like reaction of the trailing reactive EFP results in the expansion of the precursor metal EFP, leading to the increase of the perforation diameter and the decrease of the penetration capability.