椭圆形截面聚能装药射流成型及侵彻特性

为研究椭圆形截面聚能装药射流成型及侵彻特性,以及截面短轴一定时,长短轴之比对椭圆形截面聚能装药射流成型及侵彻特性的影响,开展了截面短轴直径为56 mm,长短轴之比分别为1、1.5、2的椭圆形截面聚能装药在炸高为80 mm下的侵彻深度(DOP)试验,利用ANSYS/LS?DYNA有限元软件对相关椭圆形截面聚能装药的射流成型及靶板侵彻过程进行了数值模拟。结果表明:椭圆形截面聚能装药形成的射流,除射流头部在运动拉伸过程中持续呈凝聚态外,其余部分在运动拉伸后期呈非凝聚态,非凝聚的射流由关于截面长轴面对称分布的两束具有横向速度的流体组成;射流的非凝聚现象将明显降低射流的侵彻能力;截面短轴直径为56 mm,长短轴之比从1变化至1.5时,侵彻深度由150 mm下降至47.5 mm,下降了68.3%,长短轴之比大于1.5时,侵彻能力无明显变化。

Jet Formation and Penetration Characteristics of Shaped Charge with Elliptical Cross-section

To study the jet formation and penetration characteristics of the shaped charge with elliptical cross?section,and the influence of the ratio of long axis to short axis at a fixed short axis,DOP(Depth of Penetration)tests at stand?off 80 mm were carried out for shaped charges with elliptical cross?section.The short axis diameter of elliptical cross?section is 56 mm and the ratio of long axis to short axis are 1,1.5 and 2,respectively.By using ANSYS/LS?DYNA software to construct related finite element models,the jet formation and penetration process are simulated numerically.The results showed that except for the jet head,the rest of jet was cohesionless at the late stage of stretching.The non?condensed part of jet consists of two fluids with lateral velocity symmetrically distributed over the section of long axis.The non?condensation of jet will significantly reduce the penetration ability of the shaped charge with elliptical cross?section.For the shaped charge with a short axis diameter of 56 mm,the penetration depth decreased by 68.3%from 150 mm to 47.5 mm when the ratio of long axis to short axis changed from 1 to 1.5,while no significant change of penetration ability occurred while the ratio of long axis to short axis changed from 1.5 to 2.