Investigation on the spatial distribution characteristics of behind-armor debris formed by the perforation of EFP through steel target  

作　　者：Xin Wang Jianwei Jiang Shengjie Sun Jianbing Men Shuyou Wang 

机构地区：[1]State Key Laboratory of Explosion Science and Technology,Beijing Institution of Technology,China

出　　处：《Defence Technology（防务技术）》2020年第1期119-135,共17页Defence Technology

基　　金：supported by National Natural Science Foundation of China(Grant no.11872123)。

摘　　要：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 erployed 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,respectlvely.Threedimensional 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(v_0) 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,v_0 and θ.The model can with reasonable accuracy predict the quantity and velocity distribution characteristics of BAD formed by EFP.

关 键 词：Behind-armor DEBRIS EFP FEM-SPH adaptive conversion algorithm Spatial distribution 

分 类 号：TJ410[兵器科学与技术—火炮、自动武器与弹药工程]