Abstract
Polytetrafluoroethylene (PTFE)/Al reactive material with different aluminum particle sizes were prepared by molding and sintering, and the effect of aluminum particle size on the impact behavior of PTFE/Al reactive material with a mass ratio of 50:50 was investigated. The results show that aluminum particle size has significant effects on the shock-reduced reaction diffusion, reaction speed, and degree of reaction of the PTFE/Al reactive material. At a moderate strain rate, the reaction delay of PTFE/Al increased, and the reaction duration and degree decreased, with the increase of aluminum particle size. Under the strong impact of explosive loading, aluminum particle size has little effect on the reaction delay, which maintains at about 1.5 μs–2.5 μs, but the reaction durability and degree of reaction of PTFE/Al decrease with increasing aluminum particle size. There is also a strain rate threshold for the shock-induced reaction of PTFE/Al reactive material, which is closely related to aluminum particle size. The shock-induced reaction occurs when the strain rate threshold is exceeded.
Highlights
As the final damage unit of all kinds of ammunition and missile, warheads have always played an important role in the research of weapon damage technology
When the Al particle size increases to 200 μm, the PTFE/Al reactive material suffers from incomplete reaction even under the high strain rate loading of the explosive blast
(medium strain rate) and explosive aluminum spacer in the PTFE/Al-10 μm turn black, while only part of aluminum spacer in the PTFE/Al-200 μm turns black. This phenomenon corroborates the above analysis, indicating that the Al particle size still has a relatively obvious effect on the response characteristics of PTFE/Al reactive material under strong impact; on the other hand, the fumigation degree of the aluminum separator with the addition of Al nanoparticles is more obvious than that of the PTFE/Al-200 μm, and the fumigation degree of the aluminum separator demonstrates that the mixture of Al nanoparticles and Al microparticles could modulate and improve the impact response characteristics of PTFE/Al reactive material to a certain extent
Summary
As the final damage unit of all kinds of ammunition and missile, warheads have always played an important role in the research of weapon damage technology. The mechanical properties and reaction of different particle sizes of Al/PTFE materials at medium and low strain rates were studied by Feng Bin et al [11,12,13]. Studied the influence of Al particle size on the reaction threshold of Al/PTFE reactive material under SHPB impact. The research on Al particle size is mainly focused on the mechanical properties and the reaction behaviors under low strain rate load, but little on the effect of Al particle size of PTFE/Al reactive material under high strain rate load. The influence of Al particle size on the impact response of Al-rich PTFE/Al reactive material under different strain rates was investigated by analyzing the test curves and high-speed images. This study is helpful to understand the shock-induced reaction mechanism of PTFE/Al, and may be helpful to the application of PTFE/Al reactive material
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