The behind-armor debris (BAD) formed by the perforation of an EFP is the main damage factor for the secondary destruction to the behind-armor components. Aiming at investigating the BAD caused by EFP, flash X-ray radiography combined with an experimental witness plate test method was used, and the FEM-SPH adaptive conversion algorithm in LS-DYNA software was employed to model the perforation process. The simulation results of the debris cloud shape and number of debris were in good agreement with the flash X-ray radiographs and perforated holes on the witness plate, respectively. Three-dimensional numerical simulations of EFP's penetration under various impact conditions were conducted. The results show that, an ellipsoidal debris cloud, with the major-to-minor axis radio (a/b) smaller than that caused by shaped charge jets, was formed behind the target. With the increase of target thickness (h) and decrease of impact velocity (v₀) and obliquity (θ), the value of a/b decreases. The number of debris ejected from target is significantly higher than that from EFP. Based on the statistical analysis of the spatial distribution of the BAD, An engineering calculation model was established considering the influence of h, v₀ and θ. The model can with reasonable accuracy predict the quantity and velocity distribution characteristics of BAD formed by EFP.

由EFP穿孔形成的后装甲碎片（BAD）是对后装甲组件进行二次破坏的主要破坏因素。为了研究由EFP引起的BAD，采用X射线照相照相法结合实验性的试验板测试方法，并采用LS-DYNA软件中的FEM-SPH自适应转换算法对射孔过程进行建模。碎片云的形状和碎片数量的仿真结果分别与X射线照片和见证板上的穿孔相吻合。进行了在各种冲击条件下EFP渗透的三维数值模拟。结果表明，一个椭圆形的碎片云，长轴到短轴无线电波（a / b在目标的后面形成了一个比由定型电荷射流引起的小的）。随着目标厚度（h）的增加以及冲击速度（v ₀）和倾斜度（θ）的减小，a / b的值减小。从目标喷射的碎片数量明显高于从EFP喷射的碎片数量。在对BAD空间分布进行统计分析的基础上，建立了考虑h，v ₀和θ影响的工程计算模型。该模型可以以合理的精度预测EFP形成的BAD的数量和速度分布特征。