EFP模拟弹丸侵彻陶瓷复合靶的数值模拟研究

Numerical simulations of simulated EFP penetration into alumina ceramic/steel composite target

运用LS_DYNA程序中描述陶瓷本构关系的JHC模型和二维轴对称拉格朗日算法,对EFP模拟弹丸侵彻不同厚度99氧化铝陶瓷块/金属复合靶试验进行了数值模拟,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,与实验结果进行了比对,总的侵彻深度基本相符。数值模拟和试验所得残余侵彻深度与陶瓷厚度之间基本上都呈一种良好的线性关系,因此所得质量防护系数和差分防护系数都随着陶瓷厚度的增加而增加。通过分析侵彻过程中的陶瓷损伤与演化发现:陶瓷块尺寸过小时会由于稀疏波作用使陶瓷抗弹性能下降。

With the Johnson-Holmquist constitutive ceramic model and Lagrangian algorithm, computations are presented for the simulated EFP penetrating into alumina ceramic/steel composite target. The penetration depths suits are reliable. acq The uired by simulations are compared with test data, which show the simulation redependent relations are given out between residual penetration depths, mass efficient factor, differential factor and ceramic tiles thickness both for simulation results and test data. The damage initiation and evolution in penetrating process are also showed. It demonstrates that the penetration-resisting performance of ceramic can be decreased greatly when the ceramic diameter is not enough big.