长杆弹撞击陶瓷靶的一种数值模拟方法

Ceramics are widely used in armors because of high strength, low density and excellent ballistic performance. When long rods impact the ceramics, the long rods will flow radially along the ceramic surfaces without significant penetration. The special phenomenon is called interface defeat which has important practice application in the anti-penetration performance. For the long rods impacting the ceramic targets, a two-dimensional axisymmetric numerical model in which both the Lagrange method and smooth particle hydrodynamics (SPH) method are used, is established by using the software AUTODYN. The established model is applied to simulate the penetration of the long rod into the silicon carbide ceramic with a cover plate. By changing the impact velocity of the long rod, three different phenomena are obtained including interface defeat, dwell to penetration and direct penetration. Through the verification of mesh convergence and the comparison of the numerical results to the experimental results, the reliability of the algorithm, boundary conditions and parameter settings in the numerical model is comprehensively verified. The simulated results show that if the SPH and Lagrange methods are used at the same time, the influences of particle and mesh sizes need to be considered. It is not recommended to use the SPH method for simulating the interface defeat of the ceramic targets. The methods of the modeling and parameter selections are helpful for the subsequent simulations on ceramic anti-penetration and interface defeat.