高速撞击下温压炸药的响应敏感性

采用自行设计的动态加载装置对HMX基、HMX/NTO基和HMX/FOX-7基3种温压炸药撞击响应规律进行了研究，获得炸药的临界点火速度，并通过密闭燃烧罐分析撞击后回收试样的燃烧特性。结果表明:3种温压炸药药柱在高速撞击下均经历了冲击、塑性变形、破碎飞散和点火反应阶段；HMX基、HMX/NTO基和HMX/FOX-7基温压炸药的临界点火速度分别为302.9、312.3 m/s和315.3 m/s，NTO和FOX-7能够提高温压炸药的临界点火速度；分析撞击后回收试样的燃烧特性发现，与HMX基温压炸药相比，HMX/NTO基和HMX/FOX-7基温压炸药升压时间分别增加了103.6%和103.3%，升压速率分别降低了17.3%和21.1%，且撞击后的燃烧速率显著降低。

Response Sensitivity of Thermobaric Explosive under High-speed Impact

The impact response laws of three thermobaric explosives, including HMX based, HMX/NTO based and HMX/FOX-7 based, were studied by using a self-designed high-speed impact device. Critical ignition velocity was obtained, and combustion characteristics of the recovered samples after impact were tested by the closed burner tank. The results show that all the three kinds of thermobaric explosives have experienced shock, plastic deformation, fragmentation and ignition reaction stages under high-speed impact conditions. Critical ignition velocity of HMX based thermobaric explosives is 302.9 m/s, and that of HMX/NTO based or HMX/FOX-7 based thermobaric explosives is 312.3 m/s or 315.3 m/s. The addition of insensitive explosives NTO and FOX-7 to the formulation can improve the critical ignition velocity, in which FOX-7 is more effective. Through analyzing combustion characteristics of recovered samples, it is found that compared to HMX-based thermobaric explosives, the pressure rising time of HMX/NTO based and HMX/FOX-7 based thermobaric explosives increase by 103.6% and 103.3% respectively. The pressure rising rate reduce by 17.3% and 21.1% respectively, which can significantly reduce the burning rate of thermobaric explosives after impact.