陶瓷材料抗长杆弹侵彻阻抗研究

Penetration Resistance of Ceramic Materials Subjected to Projectile's Impact

为探讨长杆弹侵彻陶瓷靶中的阻抗与侵彻速度关系，基于长杆弹侵彻半无限靶的修正流体动力学模型（Tate模型）和空腔膨胀理论流体动力学模型，结合文献中已知试验数据，求解了氧化铝和氮化铝陶瓷的Tate模型侵彻阻抗R。和空腔膨胀模型侵彻阻抗Rc．结果表明在1500～3500m／s速度范围内，氧化铝陶瓷的Rt随速度的增加而缓慢降低，氮化铝的Rc基本为恒值；在3600～4500m／s速度范围内，氮化铝陶瓷的Rt随速度的增加反而增加，可能是侵彻速率超过裂纹传播最终速率所导致；两种陶瓷的Rc都随速度的增加而减小，接近流体动力学极限时Rc值非常小，表明该模型不适合于超高速侵彻．采用平均阻抗计算的侵彻深度结果表明平均阻抗可以用于侵彻深度计算．

Using the experimental data in literature, the penetration resistances Rt and Rc of ceramic materials are calculated accurately based on the Tate＇s model and the hydrodynamic model of spherical cavity expansion theory separately. The results show that Rt of alumina ceramic decreases slightly with the increased impact velocity and Rt of aluminum nitride ceramic is approximately a constant value from 1 500 m/s to 3 500 m/s, while Rt of aluminum nitride ceramic increases with the increased impact velocity from 3 600 m/s to 4 500 m/s for the penetration velocity above the limiting velocity for the growth of cracks. Rc of two kinds ceramic decrease with the increased impact velocity and approximate to zero at hydrodynamics limiting value. It can be concluded that the hydrodynamic model of spherical cavity expansion cannot be applied in the hypervelocity penetrating condition. The comparisons between the computational penetration depths acquired with the average resistance and the experimental results show that it has satisfactory accuracy with the average resistance.