EFP侵彻陶瓷/金属复合靶实验运动网格法模拟

为高效地实现EFP弹丸成型、飞行及大炸高下侵彻氧化铝陶瓷/金属复合靶过程的数值模拟研究,采用JH-2模型描述99氧化铝陶瓷本构关系,运动网格法进行流场计算,流固耦合算法实现EFP对复合靶板的侵彻作用.该方法解决了EFP在大炸高下形成及侵彻靶板过程计算总网格数过多问题,获得了侵彻过程中陶瓷的损伤演化和分布以及在A3钢背板中的侵彻深度.结果表明:数值模拟所得EFP头部速度值与实验值基本一致,尾部速度值略高于实验值,EFP的长径比略高于实验值;在背板中的残余侵深比实验结果略高,但差别不大;EFP在钢背板中的残余侵彻深度随陶瓷厚度的增加而减小,残余侵深与陶瓷厚度之间基本呈线性关系.

Simulation of EFP Penetrating into Ceramic/Steel Composite Target Using Moving Mesh Method

To simulate the complete procedure efficiently for the explosively-formed projectile (EFP) being formed, flying in the air and penetrating into alumina ceramic/metal composite target in the condition of high stand-off, the material properties of the 99 alumina ceramic were described by JH-2 constitute model, the moving mesh method was used for the computing flow field and the EFP penetrating into alumina ceramic/steel composite target was simulated with the fluid-structure interaction arithmetic. The computation time decreased greatly with the moving meth method due to the less number of meshes. The residual penetration depths in the A3 steel back plates were acquired. The results indicate that the tip speed of the EFP is consistent with the test result and the rear speed of the EFP is a little higher than the test. Thus the residual penetration depths are a little deeper than the test results. The residual penetration depths acquired both by the tests and by the simulations decrease with the increase of ceramic thickness. There is a nearly linear relationship between the residual penetration depths and the thickness of the ceramics.