低压长脉冲作用下PBX炸药的响应特性  

Response Characteristics of PBX Explosives Under the Shock Waves of Low Pressure and Long-pluse

作　　者：孙文旭 王万军[2] 罗智恒[2,3] 代晓淦[2] 刘彤 章定国[1] SUN Wenxu;WANG Wanjun;LUO Zhiheng;DAI Xiaogan;LIU Tong;ZHANG Dingguo(School of Science,Nanjing University of Science and Technology,Nanjing 210094,China;Institute of Chemical Materials,China Academy of Engineering Physics,Mianyang 621900,China;Chengdu Science Development Center,China Academy of Engineering Physics,Chengdu 610200,China;Graduate School,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]南京理工大学理学院,江苏南京210094 [2]中国工程物理研究院化工材料研究所,四川绵阳621900 [3]中国工程物理研究院研究生院,四川绵阳621999 [4]中国工程物理研究院成都科学技术发展中心,四川成都610200

出　　处：《弹道学报》2019年第1期75-79,84,共6页Journal of Ballistics

摘　　要：为研究塑料粘接炸药(PBX炸药)在低压长脉冲作用下的响应特性,采用大落锤试验的方法对壳体约束下的炸药样品进行低速撞击加载;采用薄膜式PVDF对炸药试样顶部和底部的压力-时间曲线进行测量,通过壳体外表面的应变片测试壳体的环向和轴向应变,同时采用高速相机捕捉炸药在撞击作用下的反应发光现象;采用LS-DYNA非线性有限元软件开展数值模拟,研究大落锤冲击载荷作用下PBX炸药的动态响应特性。结果表明,落锤撞击速度为3 m/s时,炸药受撞击面的峰值压力约为100 MPa,炸药不发生反应;落锤撞击速度为5 m/s时,炸药受撞击面的峰值压力为200 MPa,炸药发生明显的化学反应;有限元计算结果与试验测试结果具有较高的吻合度,可以很好地模拟炸药在低压长脉冲冲击下的力学响应特性。In order to study the reponse characteristics of PBX explosives under low pressure and long pulse conditions,the low-velocity impact loading of erplosive samples restricted by case was carried out by the drop hammer test.The pressure-time curve of top and bottom of PBX explosives was measured by using PVDF gauges,and the hoop strain and axial strain were captured by using strain foil.The high-speed camera was utilized to determine whether chemical reaction occurring inside PBX explosives under impact.The changing process of internal pressure of PBX explosives under the drop-test shock loading was stimulated by applying LS-DYNA nonlinear finite element software.Under the condition of impact velocity of 3 m/s,the peak pressure on the top surface of PBX explosives is almost 100 MPa,and there is no chemical reaction.Under the condition of impact velocity of 5 m/s,the peak pressure on the top surface of PBX explosives is almost 200 MPa,and the obvious chemical reaction is observed during impact process.The computing results are well agreed with the test results,so the dynamic response properties of the explosives under the conditions of the low pressure and long-pluse can be stimulated very well.

关 键 词：PBX炸药 落锤试验 有限元仿真 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]