预应力对陶瓷抗侵彻性能影响规律的数值模拟

Numerical Simulation of the Effect of Pre-stress on the Ballistic Performance of Ceramics

为研究预应力陶瓷的抗侵彻性能,利用AUTODYN仿真软件模拟了对SiC陶瓷施加预应力的过程,并开展了长杆弹以不同速度侵彻预应力陶瓷的数值仿真研究,确定了预应力陶瓷的抗侵彻性能。通过对比分析,得到了不同载荷下陶瓷内部的应力分布状态,以及陶瓷抗侵彻性能与预应力的关系。结果表明:对陶瓷施加预应力可以有效提高其抗侵彻能力;但随着加载预应力的进一步提高,即当陶瓷中心部位预应力大于112MPa时,陶瓷的抗侵彻能力反而下降,陶瓷加载的预应力与其抗侵彻性能之间存在最佳匹配关系。

In this work we studied the processes of applying pre-stress on SiC ceramics by using the finite element software AUTODYN.We established a model of long-rod projectile of different velocities penetrating ceramics with different pre-stress values to investigate the ballistic performance of the pre-stress ceramic,and obtained the stress distributions in the ceramic under different loading conditions through the comparison and analysis of the results,as well as the relation of different pre-stress and ballistic performance of the ceramic.The simulated results show that the appropriate pre-stress can improve the ballistic performance of ceramic,but the ballistic performance of ceramic is reduced when the pre-stress value is greater than 112 MPa,and that there exists a best matching relationship between the pre-stress value and the ballistic performance of the ceramics.