大长径比钽爆炸成型弹丸控制研究

In order to obtain the charge structure of high-power and large aspect ratio tantalum explosively formed projectile(EFP), the influences of different structural parameters, such as shell thickness, charge height, curvature radius and thickness of liner, of tantalum liner shaped charge on the forming characteristics, such as velocity, aspect ratio, necking ratio and compactness, of tantalum EFP were studied by using AUTODYN numerical software, and the reasonable range of structural parameters was determined. On this basis, the primary and secondary orders of the influences of structural parameters on the forming performance of tantalum EFP are obtained by orthogonal optimization design, and the combination of structural parameters (shell thickness is 0.089 3D, charge height is 0.85D, curvature radius of liner is 0.982D, and thickness of liner is 0.028 6D, where D is the diameter of the charge) for EFP with high aspect ratio is determined. The results show that EFP velocity increases with the increase in shell thickness, charge height and curvature radius of liner, and decreases with the increase in liner thickness; the aspect ratio and compactness increase with the increase in shell thickness and charge height, and decrease with the increase in curvature radius of liner and thickness of liner; and the necking ratio decreases with the increase in shell thickness and thickness of liner, and decreases first and then increases with the increase in charge height and curvature radius of liner. The aspect ratio of optimized tantalum EFP is 4.76, and the penetration depth for semi-infinite steel targets is 1.08D. The penetration ability of tantalum EFP has been greatly improved compared with copper EFP.