弹丸超高速撞击铝靶成坑数值模拟

 低地球轨道的各类航天器易受到微流星体及空间碎片的超高速撞击，损伤航天器飞行关键系统，进而导致航天器发生灾难性的失效。微流星体及空间碎片防护结构设计，是航天器设计的一个重要问题。采用AUTODYN软件进行了弹丸超高速正撞击及斜撞击铝靶成坑的数值模拟，给出了二维及三维模拟结果。研究了弹丸密度、弹丸形状、板厚度、弹丸速度、弹丸直径和弹丸撞击入射角等对靶成坑的影响。模拟结果同实验结果进行了比较，模拟的成坑形状和特征尺寸同实验相吻合。验证了数值模拟方法的有效性。

Numerical Simulation of Craters Produced by Projectile Hypervelocity Impact on Aluminum Targets

All spacecrafts in low orbit are subject to hypervelocity impacts by meteoroids and space debris.These impacts can damage spacecraft flight-critical systems,which can in turn lead to catastrophic failure of the spacecraft.In order to ensure the astronauts safety and spacecraft normal operation,the design of meteoroids and space debris protection configuration become an important problem of spacecraft design.The numerical simulation of craters produced by projectile hypervelocity impact on aluminum targets at normal and oblique angles have been carried out using the AUTODYN hydro-codes in this paper.The results using two and three-dimensional simulations are given.The effect of projectile density,shapes,target thickness,projectile diameter,impact velocity and angles etc.on crater has been investigated.The simulation results are compared with experimental results,and the simulated crater shapes and characteristic sizes are consistent very well with experimental results.The validation of numerical simulation method has been verified.