长杆弹撞击装甲陶瓷界面击溃/侵彻转变速度理论模型

为预测长杆弹撞击装甲陶瓷界面击溃/侵彻转变过程，采用Hertz接触理论确定靶体内部应力，将其分别应用于陶瓷锥裂纹与翼型裂纹扩展理论。通过比较两种裂纹扩展模型计算得到的界面击溃/侵彻转变速度，提出准确预测界面击溃/侵彻转变速度的理论模型。结果表明:将两种裂纹扩展理论相结合的理论模型可以合理地解释界面击溃/侵彻转变过程，转变速度计算结果与已有实验结果吻合较好。弹体半径较小时，锥裂纹扩展控制界面击溃/侵彻转变过程；弹体半径较大时，翼型裂纹扩展控制界面击溃/侵彻转变过程。

Theoretical model of interface defeat/penetration transition velocity of ceramic armor impacted by long-rod projectile

In this study a theoretical model was established to predict the interface defeat/penetration transition velocity of a ceramic armor impacted by a long-rod projectile. Predications of the transition velocity were obtained by measuring the stress inside the target and then applying it in turn to the conical crack and the wing crack propagation theory. After that, a theoretical model consisting of the conical and the wing crack propagation theory was presented. The results show that the theoretical model can reasonably well describe the interface defeat/penetration transition process. The interface defeat/penetration transition velocity calculated by the theoretical model agrees well with the experimental results from the previously published literature. The conical crack propagation dominates the interface defeat/penetration transition process when the projectile radius is small, while the wing crack dominates the transition when the projectile radius is large.