环形射流和中心爆炸成型弹丸组合战斗部对混凝土墙的破孔特性

On the Perforation Characteristics of Concrete Wall Induced by Annular Jet and Central EFP Combined Warhead

为解决墙体大孔径开孔问题,设计了一种可以对混凝土墙体形成较大开孔的环形射流和中心爆炸成型弹丸(EFP)组合战斗部。针对环形射流成型过程中容易发生扭曲偏斜的问题,提出了变壁厚环形药型罩,通过两个偏心圆来实现环形药型罩的变壁厚,并用偏心距来决定壁厚变化的梯度。通过数值模拟,对4种不同壁厚变化梯度的环形药型罩成型过程进行分析,研究环形射流和中心EFP组合战斗部对混凝土墙体的破孔特性,得到壁厚变化梯度对环形射流形态的影响规律,确认最优的环形药型罩结构,保证环形射流具有良好的密实度和形态的同时也具有一定的外扩角度。试验验证了组合战斗部的破孔能力,结果显示组合战斗部可以对混凝土墙体形成直径大于2.5倍装药口径的通孔。

A combined warhead with annular jet and central explosively formed projectile(EFP),which can produce large holes on reinforced concrete wall,is designed to solve the problem of perforating large hole on the wall.To solve the problems of twisting and deflection in forming process of annular jet,the annular liner with variable wall thickness is proposed.The variable wall thickness of annular liner is realized by two eccentric circles,and the changing gradient of wall thickness is determined by eccentricity.The forming processes of annular liner with four different wall thickness gradients were analyzed through numerical simulation,and the numerical simulation of the annular jet and the central EFP combined warhead penetrating into concrete wall was carried out.The annular jet with better density also has a certain angle of expansion.The perforation capability of the combined warhead to the concrete wall was verified through test.The test results show that the combined warhead can produce a through hole with a diameter of more than 2.5 times larger than the diameter of charge caliber on the concrete wall.