摘要
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。
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.
作者
蔡宣明
张伟
徐鹏
高玉波
范志强
CAI Xuanming;ZHANG Wei;XU Peng;GAO Yubo;FAN Zhiqiang(School of Science,North University of China,Taiyuan 030051,Shanxi,China;High-speed Impact Research Center,Harbin Institute of Technology,Harbin 150080,Heilongjiang,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2019年第4期762-768,共7页
Acta Armamentarii
基金
国家自然科学基金项目(11602233)
山西省高等学校科技创新项目(201802082)
中北大学地下目标毁伤技术国防重点学科实验室开放研究基金项目(DXMBJJ2017-04)
中北大学2016年校科研基金项目(XJJ2016017)
关键词
战斗部装药
力学响应
应变率效应
一维应力
动态加载
数值模拟
warhead charge
mechanics response
strain rate effect
one-dimensional stress
dynamic loading
numerical simulation
