一维应力动态加载下战斗部装药力学响应预报模型

为获得战斗部装药在高过载侵彻下的动力学行为，对战斗部装药（黑索今(RDX)基高聚物粘结炸药(PBX)）在高应变率下的动态力学响应特性进行了研究。采用改进的分离式霍普金森压杆(SHPB) 实验技术对RDX基PBX炸药动态力学性能展开研究、压电传感器监测试件两端应力状态、高速相机拍摄实验中的试件变形过程，确保实验试件变形在动态应力平衡和常应变率加载条件下进行，保证实验数据的有效性。结果表明，该RDX基PBX炸药具有明显的密度效应及应变率效应，当应变超越0.075时应变率效应显著增强。基于应变能函数，建立该RDX基PBX炸药在一维应力状态下修正的Rivilin本构模型，模型拟合结果与实验结果基本相符，仿真结果得到的应变时间信号及试件变形模式与实验结果基本吻合。

Prediction Model of Mechanics Response of Warhead Charge under One-dimensional Stress Dynamic Loading

The dynamic mechanical response characteristics of warhead charge (RDX-based polymer-bonded explosive (PBX)) at high strain rate are studied to obtain the dynamic behavior of warhead charge during high overload penetration. The dynamic mechanical properties of RDX-based PBX explosive are studied by improved SHPB experimental technology. The stress states at both ends of a specimen are monitored using the piezoelectric sensors. The deformation process of the specimen in the experiment is photographed using a high-speed camera. It is ensured that the experimental specimen is deformed under the conditions of dynamic stress balance and constant strain rate loading, and the experimental data are effective. The results show that the RDX-based PBX explosive has obvious density effect and strain rate effect. As the strain exceeds 0.075, the strain rate effect increases significantly. Based on the strain energy function, a modified Rivilin constitutive model of RDX-based PBX explosive under one-dimensional stress state is established. The fitting results of the model are basically in agreement with the experimental results. The strain time signals and the deformation modes of the specimen obtained from the simulation results are basically in agreement with the experimental results.