三点爆轰机理与EFP尾翼成型研究(英文)

Investigation of Three-point Detonation Mechanism and Formation of Tails of EFP

采用爆轰波理论分析了由爆炸成形弹丸装药而成的三点起爆爆轰波的相互作用。运用LS-DYNA软件数值模拟了三点起爆方式下的爆轰波作用、超压形成、药型罩在非均衡爆轰作用下的变形过程，以及尾翼的形成机理等。研究结果显示：药型罩表面受到非均衡爆轰载荷作用，发生翻转、变形，在有超压作用的药型罩区域的压合程度小，形成弹丸尾翼，其中起爆半径对弹丸长径比、头尾速度、动能以及尾翼成形有重要影响。模拟中，起爆半径应选在20-30mm之间。实验结果对理论分析和数值模拟研究进行了验证。

The detonation wave theory was applied to analyze the interacting process of detonation waves after the shaped charge was initiated with three initiation points. And the forming process and mechanism of the hyper pressure on the symmetrical plane were obtained. The energy sources forming the EFP tails were found. The software of LS-DYNA was simulated the impacting process of detonation waves, the formation of hyper-pressure, and the deforming process of the liner. Results of simulations show the liner overturns and deforms under the action of the nonuniform loads of explosive and three pressure marks on the surface of liner are forged by hyper pressure. The displacement-time curves indicate the formation of the EFP tails is attributed to the different displacements of elements of the liner under the action of the nonuniform loads. The initiation radius has great effect on the slenderness ratio, speed, kinetic energy and shape of tails of the EFP. The appropriate initiation radius was primarily fixed on 20 mm to 30 mm. The experimental result shows a good agreement with results of theoretical analysis and numerical simulations.