弹靶尺寸对陶瓷/金属复合装甲防护性能的影响

利用Autodyn软件开展数值模拟工作，对陶瓷/金属复合装甲的防护性能与弹靶尺寸的关系进行研究。首先，建立二维轴对称SPH-Lagrange模型，并利用实验数据验证模型有效性；在此基础上对不同几何参数的弹靶撞击进行数值模拟，分析靶板厚度、靶板平面尺寸、子弹长度等对氧化铝陶瓷/铝合金复合装甲弹道极限速度的影响规律。然后，通过量纲分析，提出装甲弹道极限速度与弹靶几何参数的量纲一关系式，并在数值模拟结果的基础上建立一个装甲弹道极限速度的经验公式。

Geometrical effects on performances of ceramic/metal armors impacted by projectiles

The AUTODYN code was applied to investigate the performance changes of the ceramic/metal armors under ballistic impact with the different geometrical parameters.A two-dimensional axisymmetric SPH-Lagrange model was developed, and it was validated by the experimental results.By using the SPH-Lagrange model, numerical simulations were carried out for the impact of the alumina ceramic/aluminum armors by the cylindrical tungsten projectiles in the cases of the different geometrical parameters.Based on the simulation results, the armor ballistic limit velocities of the armors were discussed considering the thicknesses and planar sizes of the armor plates as well as the lengths and diameters of the projectiles.Dimensional analysis was performed to achieve a dimensionless formula for describing the armor ballistic limit velocity varied with the geometrical parameters.And the corresponding empirical formula was given on the basis of the numerical data.