一种HMX基PBX炸药在热与落锤撞击复合作用下的响应特性

为了研究炸药在热与撞击复合作用下的安全性,采用自行设计的试验装置,对Φ20mm×8mm的HMX基PBX进行了20~170℃范围内不同温度下50kg落锤撞击试验。试验中利用压力传感器测试撞击过程中炸药受力变化。利用高速摄影系统拍摄炸药撞击点火过程。获得了PBX炸药在不同温度下的撞击响应特性。结果表明,成型PBX炸药的撞击安全性与温度密切相关,其中82℃时撞击安全性提高,170℃时撞击安全性明显变差。在20~170℃范围内,随温度升高,PBX炸药的撞击感度先降低而后逐渐提高,这与PBX炸药在高温下的力学性能发生变化、热膨胀、热分解导致的损伤以及HMX发生晶型转变等因素有关。

Response of a HMX Based PBX Explosive Under Thermal and Drop Hammer Impact Coupling Effect

To investigate the safety of explosive under thermal and impact coupling effect,a 50kg drop hammer impact test of HMX based PBX with Φ20 mm×8 mm at 20-170℃ was performed by a self-designed experimental device.In the experiment,the pressure histories of explosive during the impact process was measured by pressure sensors.The impact ignition process of explosive was shot by the high-speed photography system.The impact response characteristics of PBX explosive at different temperatures were obtained.Results show that the impact safety of forming PBX explosive was closely related to the temperature,the impact safety at 82℃ is improved,and the impact safety at 170℃ becomes worse significantly.In the temperature range of 20℃ to 170℃,with increasing the temperature,the impact sensitivity of PBX first decreases and then increases gradually.This is related to the mechanical property changing of PBX explosive occurred at high temperature,and the damage caused by thermal expansion,thermal decomposition,and the phase transition occurrence of HMX and other factors.