长管体垂直侵彻半无限靶简化模型

A Model on the Normal Long Tubular Penetration into a Semi-infinite Target

长管体是异形侵彻体的重要组成部分。长管体侵彻靶板有明显的特殊现象 ,根据试验结果描述了长管体垂直侵彻半无限靶板的物理图像 ,建立了侵彻阶段的理论模型、进行了计算 ,并同长杆体进行了对比 ,计算与试验结果吻合较好。长管体侵彻时中间“靶芯”对侵彻过程的影响较大。初速范围在130 0m/s至 180 0m/s之间时 ,长管体的侵彻深度与初速基本呈线性关系。长管体的侵彻能力小于同长度同质量同密度的长杆体的侵彻能力。讨论了长管体侵彻深度随内外径比的变化规律。在相同内外径比下侵彻深度随速度的增大而增大 ,相同速度下侵彻深度随内外径比的增大而减小 ,并在内外径比增大的某一值时急剧减小。

Long tube is an important part in a telescopic penetrator and long tubular penetration has its obvious particular phenomenon. On the basis of experiments, the patterns of penetration of a long tube against a normal homogeneous semi-infinite target were described. On some hypotheses, a model of long tubular penetration into a semi-infinite target, contrasted to that of a long rod, was established and calculated. Theoretical and experimental results are found to be in good accordance. Effects of the “residual core” in the target on long tubular penetration are important. The depth of long tubular penetration has a linear relationship with the velocity at 1300～1800m/s. The performance of the long tube is proved to be worse than that of the long rod with the same mass, length and density. The rule of depth varied by the ratio of inner to outer radii was also analyzed. The penetration depth increases with the increase of velocity at the same ratii of inner to outer radii. It decreases with the increase of ratio of inner to outer radii at the same velocity and decreases sharply at some point. This study can be of some assistance in the design of extended projectile.