双层楔形装药ERA干扰聚能射流的数值模拟

Numerical Simulation of the Interference of Double-layer Wedge-Charge ERA on Shaped Jet

在现有双层平板装药结构爆炸反应装甲(ERA)的基础上,设计了4种双层楔形装药ERA,利用模拟仿真软件LS-DYNA 3D对其干扰射流的能力进行评估,分别对侵彻过程中平板运动状态、射流头部的速度变化及偏转程度、杵体断裂情况、侵彻靶板的深度及分布等进行分析,以选出最优方案。对比发现:方案3聚能射流速度下降最快,侵彻深度最浅且分布均匀,拥有最好的防护性能;方案4次之;方案1较方案4差些;方案2最差。且方案3和方案4中出现类似于爆炸焊接原理形成的复合飞板层。合理使用楔形装药可以使射流切割更加均匀,增强坦克的防护性能,为以后在装药结构上的探索提供了理论依据。

Based on the existing double-layer flat-charge explosive reactive armor(ERA),we designed 4 different structures of double-layered wedge-charge ERA,and employed the LSDYNA-3D software to evaluate their ability of interfering with the jet.We analyzed the motion state of flying-plates,the velocity and deflection of the jet head,the slug fracture,the depth of penetration,and the jet distribution in the target to select the optimal solution.The comparison shows that Scheme 3 has the fastest jet velocity reduction rate with the smallest and evenly distributed penetration depth.It can be seen that Scheme 3 has the best protection performance,followed by Scheme 4,Scheme 1 and Scheme 2 in sequence.In Scheme 3 and Scheme 4,a composite flying-plate layer similar to the explosion welding principle has been observed.Through the simulation study of the double-layer wedge-charge ERA,it is found that the reasonable use of the wedge-shaped charge can make the jet cutting more uniformly and enhance the protective performance of tanks,which provides a theoretical basis for future research on the charge structure.