利用分离式Hopkinson压杆技术研究浇注 PBX炸药的老化性能

利用分离式霍普金森压杆（SHPB）技术研究了HTPB/AP基浇注PBX炸药70 ℃下的老化性能和在不同应变率、不同老化时间、不同温度下的动态力学性能；同时，运用扫描电子显微镜分析了炸药在高应变力下的微观损伤结构。结果表明，高应变率下的应力应变大于低应变率下，应力应变具有应变率效应；随着老化时间的增加，高温试验条件下，浇注PBX炸药的失效应变从0.364减小到0.343，失效应变逐渐减小；低温试验条件下，浇注PBX炸药的失效应变在0到56 d时从0.32增加到0.34，之后基本保持不变。同时，微观、宏观损伤模式表明，界面脱黏和晶粒破碎两种损伤模式并存，应变率越高，晶粒的破碎作用越明显。

Application of Split Hopkinson Pressure Bar Technique in Aging Properties Study on Casting Polymer Bonded Explosives

In order to study aging properties of HTPB/AP based casting polymer bonded explosive (PBX) at 70℃, the split Hopkinson pressure bar technique was selected for dynamical mechanics properties at different strain rates, different aging times, and different temperatures. Microstructure of explosive in high strain was analyzed by scanning electron microscope. Results show that strain-stress in high strain rate is greater than that in low strain rate. Strain-stress has strain rate effect. Failure stress of casting PBX at high temperatures decreases from 0.364 to 0.343 with increasing of aging time, and failure strain increases slowly. Failure stress of casting PBX at low temperatures increases from 0.32 to 0.34, with increasing of aging time from 0 d to 56 d, and then it keeps stable. Ansticking of binder filler/binder and grain crushing coexist, the more strain rate increases, the more obvious and simultaneous appearance of grain crush from damage model of microstructure and macrostructure.