ABSTRACT

The formation and initiation behaviors of double-layer shaped charge (DLSC) are investigated. The DLSC comprised an inner metal liner, coupled with an outer metal or polymer liner. The nonlinear dynamic analysis software Autodyn-2D is used to simulate and compare different kinds of liner material combination shaped charges. The effects of the impedance of materials on DLSC deformation are discussed. Acoustic impedance difference exerts a negligible effect on jet tip velocity. The simulation results showed that the high impedance difference material combination DLSC forms an excellent jet. Meanwhile, Chapman–Jouguest (C-J) detonation velocity and jet tip velocity cause an important effect on DLSC penetration and initiation. DLSC offers excellent penetration capability as tip velocity increased firstly and then decreased by increasing to the C-J detonation velocity. Moreover, compared with the conventional metal single copper jet initiating charge, the complete response time of target charge decreased at the same standoff by the suitable DLSC. Thus, DLSC can be used as a new kind of penetrator to initiate charges.

抽象的

研究了双层成形装药（DLSC）的形成和引发行为。DLSC包含一个内部金属衬里，与一个外部金属衬里或聚合物衬里相连。非线性动力学分析软件Autodyn-2D用于模拟和比较不同种类的衬里材料组合成形装药。讨论了材料阻抗对DLSC变形的影响。声阻抗差对喷射速度的影响可忽略不计。仿真结果表明，高阻抗差材料组合DLSC形成了优良的射流。同时，Chapman–Jouguest（CJ）爆震速度和喷嘴尖端速度对DLSC的穿透和起爆产生重要影响。DLSC具有出色的穿透能力，先端速度先增加，然后再增加至CJ爆轰速度，然后再降低。而且，与传统的金属单铜喷射引发电荷相比，通过适当的DLSC，在相同的间隔下，目标电荷的完全响应时间缩短了。因此，DLSC可以用作一种新型的穿透器来发起指控。