摘要
为获得高威力大长径比钽爆炸成型弹丸(EFP)的装药结构,采用AUTODYN数值软件开展了钽罩聚能装药不同结构参数(壳体厚度、装药高度、药型罩外曲率半径及药型罩厚度)对钽EFP成型特性(速度、长径比、颈缩率及密实度)的影响研究,确定了各结构参数的合理取值范围。通过正交优化设计得到了各结构参数对钽EFP成型性能指标影响的主次顺序,确定了能形成性能良好的大长径比EFP的结构参数组合(壳体厚度为0. 089 3D、装药高度为0. 85D,药型罩外曲率半径为0. 982D及药型罩厚度为0. 028 6D,D为装药直径)。研究结果表明:钽EFP速度随着壳体厚度、装药高度、药型罩外曲率半径的增大而增大,随着药型罩厚度的增大而减小;长径比及密实度随着壳体厚度、装药高度的增大而增大,随着药型罩外曲率半径及药型罩厚度的增大而减小;颈缩率随着壳体厚度、药型罩厚度的增大而减小,随着装药高度、药型罩外曲率半径的增大先减小后增大。优化方案钽EFP长径比为4. 76,对半无限45号钢靶侵彻深度1. 08D,相比铜EFP侵彻能力有较大程度的提升。
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 3 D,charge height is 0. 85 D,curvature radius of liner is0. 982 D,and thickness of liner is 0. 028 6 D,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. 08 D. The penetration ability of tantalum EFP has been greatly improved compared with copper EFP.
引文
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