PBX模拟材料动态力学响应及细观损伤模式

基于分离式霍普金森压杆(SHPB)装置对高聚物粘结炸药(PBX)模拟材料进行高应变率(1763~2650 s-1)动态压缩实验,采用铅整形器得到正弦入射脉冲。聚偏氟乙烯(PVDF)压力传感器监测试件两端的应力状态,高速相机拍摄试件的变形和破坏过程,激光位移计测量试件的轴向应变,采用电子显微镜观测细观结构形貌和损伤模式。结果表明,PBX模拟材料具有应变率相关性;结合界面脱粘和晶体断裂理论,认为晶粒与粘结剂的分离,晶粒脆性断裂是该PBX模拟材料的主要细观损伤模式。

Dynamic Mechanics Response and Mesoscopic Damage of a PBX Simulant

By using split Hopkinson pressure bar (SHPB) device, the dynamic compression experiments of polymer bonded explosive (PBX) simulants were performed under high strain rates (1763~2650 s^-1) loading. Sine pulse of the incident bar was obtained with a lead pulse shaper. The stress states on both ends of the specimen were monitored by polyvinylidene fluoride(PVDF) pressure sensor, respectively. The deformation and failure process of the specimen were shot by high speed camera, and the axial strain of the specimens was monitored by the laser displacement meter. Mesoscopic structure morphology and damage model of the specimen were observed by electron microscope. Results show that the PBX simulant is sensitivity to strain rates. Combining with interface debonding and crystal fracture theory, the grain fracture and the separation between grain and binder are mainly mesoscopic damage model for the PBX simulant.