双层A3钢靶对平头杆弹的抗侵彻性能研究

 钢板被广泛用于构建防护结构，大量文献报道了单层金属靶的防护性能，而对双层金属靶，特别是大间隙双层金属靶，报道的却很少。在轻气炮上进行了平头杆弹体正撞击由两层5 mm厚A3钢板组成的接触式和具有200 mm间隙的间隙式双层靶的实验研究，得到了两种结构的初始-剩余速度曲线。实验表明：（1）两种形式双层靶均发生了充塞剪切；（2）接触式双层靶的弹道极限是5 mm单层A3靶的1.92倍；（3） 间隙式双层靶的抗侵彻性能具有较大的分散性，通过高速摄像和对回收靶板的分析表明，该分散性产生的原因是，弹体贯穿第一层靶后存在两种典型弹道状态；（4）间隙式双层靶存在两个弹道极限；（5）接触式双层靶的弹道极限接近或者大于间隙式双层靶的弹道极限。使用ABAQUS/EXPLICIT有限元软件进行了相应的数值模拟，得到了与实验一致的现象和结果。

Investigation on the Ballistic Resistance of Double-Layered A3 Steel Targets Against Blunt Projectile Impact

Steel plates are widely used to construct resistant structures,and a lot of literature report on the ballistic resistance of metallic monolithic target.However,few reports can be found for double-layered target(DLT),especially the one with large gap space.Experimental study was conducted on the DLTs of both in contact(I-DLT) and with 200 mm gap space(S-DLT) by using a gas gun to fire blunt projectiles.Each DLT was made of two A3 steel plates with the thickness of 5 mm.From the experiments,initial-residual velocity curves were obtained.The experimental observations are as follows.Firstly,both configurations of DLT suffer from shear plugging.Secondly,the ballistic limit of I-DLT is 1.92 times of that of 5 mm thick monolithic target.Thirdly,the ballistic resistance of S-DLT yield to large divergence.The large divergence,according to the high speed photograph and the recovered targets,is caused by the two classical different trajectory statuses of the projectile after perforation of the first plate.Fourthly,there are two ballistic limits for S-DLT.Finally,the ballistic limit of I-DLT is close to or greater than that of S-DLT.Parallel numerical simulations were conducted by ABAQUS/EXPLICIT,and the experimental phenomena and results were well predicted.