环形EFP的形成和侵彻效应

Study on Annular EFP Formation and Penetration Effect

设计了两种可形成环形弹丸的装药结构——环锥形和环球形EFP。通过数值模拟和破甲试验,对环形弹丸的形成和侵彻靶板的特点进行了研究。结果表明,通过使药型罩由中心向外翻转,两种方案都可在0.5～2.0倍炸高范围内形成环形弹丸,侵彻孔径可达1倍装药口径,穿深可达0.3倍装药口径。相对于环锥形EFP,环球形EFP产生的环形弹丸更完整,稳定时间更长,侵彻靶板的效果更好。与普通EFP和环形射流相比,虽然环形EFP的穿深小,但开孔孔径很大,这为串联战斗部的前级装药设计提供了一种新的技术途径。

Two charges, annular EFPs with sphere liner and cone liner, were designed which can form ring shaped projectiles. The ring-shaped projectile formation and penetrating steel target was studied by numerical simulation and experiment. The results indicate that the liners of two charges can form ring-shaped projectiles by a stand-off between 0.5 and 2 charge diameter （CD）, the formed holes at least 1 CD in diameter and 0.3 CD in depth. The ring-shaped proiectiles formed by sphere liner were more stable with better shape and performance against target than that of the cone liner. In contrast with conventional EFP and annular jet, annular EFP punched out less deep hole but larger in diameter, so it can be a new means to be used as first stage shaped charge in a tandem warhead.