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在大炸距条件下使用EFP时,其性能受到材料密度、极限拉伸以及所需的气动稳定性的限制。因此,大炸距下气动稳定的EFP对均质装甲的侵彻能力局限在一倍口径左右。为了对付更硬的目标或减小EFP战斗部的尺寸,需要对EFP技术进行改进。由Textron Defense systems和美国陆军兵器研究和工程中心开发出一种新颖的、可突破这些限制的方法。该方法中的药形罩由两层组成,外层罩为一铁环,叠嵌在内层的钽罩上。起爆以后,钽罩压垮并通过铁环中心的孔,形成长且致密的EFP弹芯,外层的铁罩部分压垮并形成稳定裙。两个药形罩在形成过程中滑动、连接并形成一个抽出式气动稳定的EFP。因为铁形成了尾裙,整个钽罩用来形成弹芯。到目前为止,弹芯的长度比相同整体罩所获得的要长27%。此技术可用于许多正在研制的项目,如WAW、SADARM、STAFF、SFW以及Smart Mortar等。
The performance of EFP when used at large breech conditions is limited by material density, ultimate elongation and the required aerodynamic stability. As a result, the PFP, which is aerodynamically stable at large bombing distances, is limited to about twice the caliber of homogeneous armor penetration. EFP technology needs to be improved in order to deal with harder targets or to reduce the size of the EFP warhead. Developed by Textron Defense Systems and the US Army Weaponry Research and Engineering Center, a novel approach that breaks through these limitations is developed. In the method, the medicine cover is composed of two layers, and the outer cover is an iron ring which is embedded on the inner tantalum cover. After detonation, the tantalum cap is crushed and passes through the hole in the center of the ferrule to form a long and dense EFP core, which is partially crushed and forms a stable skirt. The two drug shields slide during formation, connecting and forming a draw-out aerodynamically stable EFP. Since the iron forms a tail skirt, the entire tantalum cover is used to form the core. So far, the length of the cartridge has been 27% longer than that obtained with the same integral cover. This technology can be used for many projects under development, such as WAW, SADARM, STAFF, SFW and Smart Mortar.