含泡沫铝防护结构的超高速撞击数值模拟研究

 泡沫铝是一种新型航天器防护材料，拥有良好的抵御空间碎片超高速撞击的特性。模仿泡沫金属的生产原理，建立了泡沫金属微结构几何模型，结合自编的光滑质点流体动力学程序进行了超高速撞击数值仿真，通过与实验结果的对比，验证了模型的有效性。提出了两种含泡沫铝的空间碎片防护结构，即填充泡沫铝结构和夹层泡沫铝结构。对这两种结构分别进行了仿真计算，获得了其撞击极限曲线。分析结果表明，在空间碎片防护领域涉及的大部分撞击速度区间内，填充泡沫铝结构的防护性能优于夹层泡沫铝结构。

Numerical Simulation Investigation in Hypervelocity Impact on Shield Structure Containing Aluminum Foam

Aluminum foam is a new type of material for shield of spacecrafts which bears fine characteristics when subjected to hypervelocity impact of space debris. A microstructure model of geometry for metallic foams was developed to simulate their manufacturing process. Numerical simulations on hypervelocity impact were carried out using self-programmed Smooth Particle Hydrodynamics, and the proposed model is validated by comparison with experimental results. Two Al-foam-containing shield structures against space debris were presented including Al-foam stuffed shield and Al-foam sandwiched shield. Ballistic limit curves of both shields were obtained respectively through numerical simulations. Analyses results indicate that the shield performance of Al-foam stuffed shield is better than that of Al-foam sandwiched shield for the majority of impact speed range referring to shield against space debris.