W骨架/Zr基非晶合金复合材料破片的冲击释能特性

Shock-induced Reaction Characteristics of Porous W/Zr-based Metallic Glass Composite Fragments

W骨架/Zr基非晶合金复合材料是一种新型含能结构材料。采用准密封箱冲击超压实验,研究了W骨架/Zr基非晶合金复合材料的在不同冲击速度下和靶板厚度下的冲击释能特性。并根据温度控制含能结构材料冲击诱发化学反应的热动力学理论,确定了材料的化学反应参数,分析了材料的热化学反应特性。结果表明,材料冲击超压峰值与冲击速度正相关,其激发反应阈值为766m/s,在相同速度下,有使破片靶后释能效率最大化的最优靶板厚度,但在8 mm厚钢靶范围内,前板厚度对冲击释能特性影响不大。材料冲击激发化学反应的冲击压力阈值Pc=18.37GPa,对应的理论温度阈值Tc=3736.6K。材料反应效率随着冲击压力和击波温度的增加而增加,在40 GPa冲击压力范围内,材料并未完全反应,其理论反应效率达到61.5%。

Quasi-sealed chamber tests were applied to W/Zr-based metallic glass composite,which is a novel form of multifunctional energetic structural material,to investigate its shock-induced reaction characteristics at various impact velocities.The influence of the cover plate thickness on the overpressure was also studied.Thermochemical theory of temperature controlled shock-induced chemical reactions was used to analyze the reaction characteristics of the material,as well as to identify the reaction parameters.The experimental and theoretical results show that the peak value of the quasi-static pressure is positively correlated with impact velocity of the fragments.The critical velocity to initiate the reaction is around 766 m/s.At a particular velocity,there is an optimal thickness of the cover plate to maximize the overpressure behind the plate.However,when the cover plate thickness is less than 8 mm,the overpressure behind the plate is relatively small.The critical shock pressure Pc to initiate the chemical reaction is about 18.37 GPa.The theoretical critical shock temperature Tc is calculated to be 3736.6 K.The theoretical results show that the reaction efficiency in the chamber increases as the shock pressure or temperature increases.The theoretical reaction efficiency reaches 61.5%when the shock pressure is 40 GPa,indicating that the chemical reactions of the material do not run to completion in the experiments.