不同药型罩壁厚组合影响同轴EFP成型规律研究

INFLUENCE OF DIFFERENT WALL-THICKNESS COMBINATIONS OF ARC-CONE LINER ON COAXIAL EFP FORMING LAW

运用LS-DYNA仿真软件研究了弧锥结合双层药型罩不同壁厚组合方式对同轴EFP成型的影响规律。以单层紫铜罩形成EFP战斗部的数值模拟和脉冲X光摄影实验研究为基础,对总厚度为3.5mm双层紫铜药型罩,通过改变内外药型罩厚度,对比分析形成同轴EFP性能,得出不同厚度内外药型罩组合方式下同轴EFP成型规律。研究结果表明:内外药型罩分离是由炸药爆轰后产生的冲击波和药型罩自由面反射的卸载波相互作用产生的。内外药型罩厚度比在0.75～2.50时,弧锥结合双层药型罩可成型外形良好的同轴EFP。随着厚度比增大,内外药型罩所形成的两个EFP分离趋势逐渐增大。

The influence of different wall-thickness combinations of arc-cone liner on coaxial EFP form- ing law was researched by LS-DYNA software. Based on numerical simulation and experimental research of flash X-ray photograph for typical status of EFP warhead which was formed from single layer liner, through changing the different wall-thickness combinations of double-layer copper shaped charge liner whose total thickness was 3.5 mm, and contrastively analyzing coaxial EFP forming performance, the form- ing law of coaxial EFP influenced by different combinations of arc-cone liner was obtained. The study showed that the separation of inside and outside liner was the interaction of the shock waves generated by explosive detonation and unloading wave reflected by the free surface of shaped charge liner. Coaxial EFP could be formed better from double-layer copper shaped charge liner, which was combined arc with cone, when the thickness ratio was between 0.75 and 2.50. The two forming coaxial EFPs would gradually separate with the increase of thickness ratios.