基于 SPH-FEM方法的半球形聚能装药破甲特性研究

摘要

In order to investigate the formation of rod-liked jet and the penetration properties,a SPH-FEMmodel of hemispherical shaped charge was established to simulate the formation of metal jet and its penetration into double-shells. Through the analysing the formation process of shaped charge jet,the attenuation of velocity and the process of crevasse forming,it is shown that a metal jet with a high speed will be generated after the liner gets deformation under the detonation of shaped charge;the maximum velocity of jet head reaches about 4 174 m /s;during the penetration process of the first layer of shells by the jet,it experiences plug failure,denting,petaling etc.In addition,the jet breakup happens before the jet penetrates the second layer of shells and the initial crevasse occurs.The calculation and analysis presented above may be helpful for designing shaped charges.%为了研究杆式射流的形成及破甲过程，基于 SPH-FEM方法建立半球形聚能装药模型，对半球形聚能装药起爆后形成金属射流及射流穿透双壳的过程进行仿真模拟。通过对射流形成过程、速度衰减规律以及壳体破口形成过程进行分析，得到以下结论：在半球形聚能装药的爆轰作用下，药型罩被高压冲击变形继而形成了高速的金属射流；射流头部最大速度可达约4174 m／s；射流在击穿双壳的过程中会发生断裂形成射流断裂块，第一层壳在被击穿过程中，经历了冲塞、凹陷等过程，第二层壳直接被射流穿透，之后不断地被射流断裂块击穿。整个计算旨在对半球形聚能炸药的工程设计提供参考。