弹体斜侵彻多层间隔混凝土薄靶姿态偏转机理研究

Effect of Projectile Oblique Penetrating into Multi-Layered Thin Concrete Slabs on Attitude Deflection

针对弹体斜侵彻多层间隔混凝土薄靶姿态容易偏转问题,建立了弹靶有限元数值仿真模型以及相结合的弹体姿态偏转理论分析方法,研究了弹体外形参数对侵彻单层薄靶姿态偏转角速率变化以及多层间隔薄靶弹道容易发散的物理规律.研究结果表明,采用钝头大长径比弹体外形侵彻多层间隔薄靶弹道更稳定,弹体扩尾结构对弹道发散有明显抑制作用;在弹体姿态偏转性能缩比考核时,需对靶板厚度、层间距均进行等尺度缩比,实现缩比弹体在运动中所受阻力、力矩等物理量的等效.

To solve the problem of attitude deflection appeared in projectile oblique penetrating into multilayered thin concrete slabs, a finite element analysis model and relevant analytical method were proposed for projectile attitude deflection. Firstly, the effect of projectile shape parameters on the rate of angular change was studied for the penetration of the single-layered concrete slab. And then, the attitude deflection trend was analyzed for the penetration of the multi-layered concrete slabs. The research results show that a stable trajectory can be got when a projectile shape with blunt, high length–to-diameter ratio and expanded tail is used to penetrate into multi-layered thin concrete slabs. To arrange a scaling test for the validation of attitude deflection performance, the proportions on thickness of slabs, floor height should be made the same with the length of projectile,making all physical quantities equivalence such as resistance and moment in the movement of scaled projectile.