双层罩轴向组合式装药结构MEFP数值模拟

Numerical Simulation of MEFP for Axial Combined Charge Structures with Double Layer Liners

为提高多爆炸成型弹丸(MEFP)对装甲目标的侵彻能力,提出一种双层罩轴向组合式装药结构MEFP。MEFP采用中心1枚双层,周向8枚双层的药型罩结构。在爆炸成型过程中,中心双层主罩可成型2枚EFP,周向8枚双层辅罩可成型16枚EFP,对装甲有多点位、双重侵彻毁伤。基于该结构的可行性,利用ANSYS/LS-DYNA软件对该MEFP成型及侵彻过程进行了数值模拟,具体分析了装药高度、主(辅)曲径比、主(辅)壁厚、主(辅)前后级壁厚比等因素对其成型过程的影响,并将较好的成型结果对45#钢靶板进行了侵彻仿真。研究结果表明:在装药高度75 mm、主(辅)曲径比为1.0(1.3)、主(辅)壁厚4 mm(2.5 mm)、主(辅)前后级壁厚比值0.5时,MEFP成型较好。MEFP在穿透两层12 mm 45#钢靶板后,仍具有一定的后效侵彻能力;在炸高大于2 m时,成型的MEFP具有多点位毁伤效应,且随着炸高的增加,毁伤落点半径增大。研究的双层罩轴向组合式装药结构MEFP结构对末敏弹战斗部设计具有重要的参考意义。

To improve the penetration ability of multiple explosively formed projectiles(MEFP)against armored targets,a double-layer shield axial combination charge structure MEFP is proposed.The MEFP adopts a double-layer liner structure with 1 in the center and 8 double-layer liners in the circumferential direction.During the explosion forming process,the central double layer main cover can form 2 EFPs,and the circumferential 8 double layer auxiliary covers can form 16 EFPs,which can cause multi-point and dual penetration damage to the armor.Based on the feasibility of this structure,numerical simulation is conducted on the formation and penetration process of the MEFP using ANSYS/LS-DYNA software.The effects of factors such as charge height,main(auxiliary)curvature ratio,main(auxiliary)wall thickness,and main(auxiliary)front and rear stage wall thickness ratio on its formation process are analyzed in detail.The good formation results are used for penetration simulation on the 45#steel target plate.The research results indicate that MEFP is well formed with the charge height being 75 mm,the main(auxiliary)curvature ratio being 1.0(1.3),the main(auxiliary)wall thickness being 4 mm(2.5 mm),and the ratio of the main(auxiliary)front and rear wall thickness being 0.5.After penetrating two layers of 12 mm 45#steel target plates,MEFP still has a certain aftereffect penetration ability;When the explosion height is greater than 2 m,the formed MEFP has a multi-point damage effect,and as the explosion height increases,the damage drop radius increases.The research and design of the double-layer cover axial combination charge structure MEFP has important reference significance for the terminal sensitive projectile warhead.