Abstract
The traditional polytetrafluoroethylene (PTFE)/Al reactive material liner shaped charge generally produces insufficient penetration depth, although it enlarges the penetration hole diameter by chemical energy release inside the penetration crater. As such, a novel high-density reactive material liner based on the PTFE matrix was fabricated, and the corresponding penetration performance was investigated. Firstly, the PTFE/W/Cu/Pb high-density reactive material liner was fabricated via a cold pressing/sintering process. Then, jet formation and penetration behaviors at different standoffs were studied by pulse X-ray and static experiments, respectively. The X-ray results showed that the PTFE/W/Cu/Pb high-density reactive material liner forms an excellent reactive jet penetrator, and the static experimental results demonstrated that the penetration depth of this high-density reactive jet increased firstly and then decreased by increasing the standoff. When the standoff was 1.5 CD (charge diameter), the penetration depth of this reactive jet reached 2.82 CD, which was significantly higher than that of the traditional PTFE/Al reactive jet. Moreover, compared with the conventional metal copper jet penetrating steel plates, the entrance hole diameter caused by this high-density reactive jet improved 29.2% at the same standoff. Lastly, the chemical reaction characteristics of PTFE/W/Cu/Pb reactive materials were analyzed, and a semi-empirical penetration model of the high-density reactive jet was established based on the quasi-steady ideal incompressible fluid dynamics theory.
Highlights
Reactive material liner is a kind of integrated solid energetic liner prepared by filling metal powders in a high polymer binder, typically such as polytetrafluoroethylene (PTFE)/Al and PTFE/Cu, and fabricating by a cold pressing and sintering process [1,2]
This paper firstly proposes a high-density reactive material liner based on the PTFE/W/Cu/Pb formulation system
The results revealed that this class of PTFE/W/Cu/Pb reactive material liner could form a reactive jet with excellent performance, including the distinct jet outline, clear jet tip and rear, and satisfied jet continuity
Summary
Reactive material liner is a kind of integrated solid energetic liner prepared by filling metal powders in a high polymer binder, typically such as polytetrafluoroethylene (PTFE)/Al and PTFE/Cu, and fabricating by a cold pressing and sintering process [1,2]. The energy release characteristics of reactive material liners with different formulations were analyzed by using the JAGUAR thermochemical equation, and the coupled defeat effects of kinetic energy and chemical energy for reactive material liner shaped charges against desired targets were preliminarily conducted by experiments [3]. Daniels et al studied the reactive jet formation behavior by simulation and further conducted experiments on the damage behavior of large-caliber reactive liner shaped charges against typical targets, such as concrete culvert and Materials 2019, 12, 3486; doi:10.3390/ma12213486 www.mdpi.com/journal/materials. Sun et al compared the penetration performance between Ni-Al and Cu-Ni-Al reactive material liner shaped charges, and the experiments showed that the addition of Cu powders increased the average penetration hole diameter, and improved the average penetration depth [13]. The reaction mechanism of PTFE/W/Cu/Pb reactive materials was discussed, and a theoretical penetration model was established by introducing the reaction delay time of reactive materials
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