平头弹穿透接触式双层金属板的理论研究

Theoretical Study of the Perforation of Double-Layered Metal Targets without Spacing Struck by Flat-Ended Projectiles

在工程实践中,为提高靶板的抗弹性能通常用双层板代替单层板,对平头弹穿透等厚接触式双层金属板进行了理论研究。基于先前单层金属板的穿透理论和实验研究,提出了等厚接触式双层金属板穿透的新模型,利用靶板破坏的应变失效准则分别求出两层板发生的最大整体变形及消耗的能量,根据能量守恒求得双层板的弹道极限。模型预测结果与有限的实验数据吻合较好。当总厚度大于绝热剪切冲塞临界厚度值时,双层板的弹道极限明显高于单层板的弹道极限;小于该值时,双层板与单层板的弹道极限差别不大。

A monolithic metal plate is usually replaced with a double-layered metal target with the same thickness to improve the ballistic limit in practical engineering.This paper presents a theoretical study of the perforation of a double-layered metal target without spacing by a flat-nosed projectile.Based on the previous analytical work and experimental observations a new theoretical model was proposed to predict the peroration of the double-layered metal target in comparison with the test data available.It was found that the predictions made from the present model are in good agreement with the test data.It was also found that the ballistic limit for a double-layered metal target is considerably higher than that for a monolithic one when its thickness is larger than the critical thickness at which adiabatic shear plugging occurs;that the ballistic limits are more or less the same for both targets when the total thickness is below the critical value.