弹体攻角侵彻混凝土靶的工程计算模型

摘要

In order to study influences of changes of oblique angle and attack one on a projectile''s penetrating process, the engineering calculation model was established based on the surface splitting mechanism and rigid kinematic equations.Using this calculation model, changes of forces and overloads of the projectile''s penetrating process were observed, and the varying laws of the penetrating ballistic trajectory with the variation of oblique angle and attack angle were obtained.It was shown that a negative attack angle has a certain ability to reduce ballistic deflection of oblique penetration, but a positive attack angle has an ability to enlarge this deflection;the calculated results agree well with the test data, so the calculation model can correctly predict the dynamic process of the projectile''s penetrating into a concrete target;this method can provide a applicable means for ballistic trajectory analysis of oblique penetration, especially, for those in cases of opening a pit and initial deflection prediction.%为了研究倾角、攻角等参数的变化对侵彻过程的影响,基于表面层裂机理和刚体运动学方程,建立了用于分析弹体斜侵彻混凝土靶的工程计算模型.利用该计算模型得到弹体侵彻过程中的受力和过载的变化情况,获得侵彻弹道随倾角、攻角等参数变化的规律:负攻角对斜侵彻的弹道偏转具有一定的抑制作用,正攻角对斜侵彻的弹道偏转具有放大作用.计算结果与试验数据吻合较好,表明该计算模型能准确地预估弹体斜侵彻混凝土的动力学过程.该方法可以为弹体对混凝土靶的斜侵彻弹道分析,尤其开坑、初始偏转预估提供一种实用手段.