三种PBX炸药的动态拉伸力学性能

Dynamic Tensile Mechanical Properties of Three Types of PBX

为了获得几种PB X炸药的动态拉伸力学性能,结合平台巴西盘实验和霍普金森加载技术建立了动态拉伸实验测试系统,分别通过石英晶体片和数字图像相关方法来测量应力和应变信号,得到了PB X炸药在应变率102s-1附近间接拉伸条件下的应力应变曲线,并建立了对应的动态拉伸本构关系模型。结果表明,PB X炸药的拉伸强度、失效应变和拉伸弹性模量都表现出一定的应变率相关性,本构关系拟合曲线与实验数据吻合良好。

Tensile mechanical properties of some PBXs were evaluated by Flattened Brazilian Disc（FBD） and Split Hopkinson Press Bar（SHPB）.Quartz transducers and digital image correlation（DIC） technology were used to measure stress and strain information.Stress-strain curves of three types of PBXs under strain rate of 102 s-1 were obtained.Results show that all of the tensile strength,failure strain and dynamic modulus have relationship with the loading strain rate.A constitutive model had been established based on the experimental data.