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以空间碎片防护设计为工程应用背景,将亚稳态含能材料应用于空间碎片防护结构。利用二级轻气炮对聚四氟乙烯/铝(PTFE/Al)含能材料防护结构进行了不同面密度、不同弹丸直径、不同速度的超高速撞击实验,获得了撞击过程中的高速摄像图片及光学高温计信号。分析结果表明,含能材料防护屏超高速撞击瞬间发生了可靠的冲击起爆反应,根据反应度的不同可分为冲击爆轰区、破碎爆燃区、零反应破碎区3个区域。基于实验结果,建立了铝合金弹丸超高速撞击PTFE/Al含能材料防护屏穿孔直径的无量纲经验公式。利用实验与分析结果验证了数值模拟的有效性,获得了环境温度对PTFE/Al含能材料防护屏超高速撞击穿孔特性的影响规律。
Based on the engineering background of space debris protection design, metastable energetic materials are applied to the space debris protection structure. Two kinds of light gas guns were used to test the protective structure of PTFE / Al energetic materials with different areal density, different projectile diameters and different velocities. The images of the high speed camera during impact were obtained And optical pyrometer signal. The analysis results show that there is a reliable impact detonation reaction at the moment of ultra-high speed impact of energetic material shielding screen. According to the degree of reaction, it can be divided into three areas: impact detonation zone, explosive deflagration zone and zero reaction broken zone. Based on the experimental results, a non-dimensional empirical formula for the perforation diameter of PTFE / Al energetic material super-high-speed impacting aluminum alloy projectile was established. The experimental and analytical results verify the effectiveness of the numerical simulation and obtain the influence of ambient temperature on the ultra-high-speed impact perforation characteristics of the PTFE / Al-containing material shielding screen.