空间碎片超高速碰撞问题的SPH方法模拟  

Numerical simulation of hypervelocity impacts of space debris using SPH method

作　　者：徐金中[1] 汤文辉[1] 

机构地区：[1]国防科学技术大学理学院技术物理研究所

出　　处：《强度与环境》2008年第5期25-31,共7页Structure & Environment Engineering

摘　　要：采用Tillotson物态方程和Steinberg-Cochran-Guinan(SCG)本构模型,利用光滑粒子流体动力学方法对铝质球形弹丸和柱状弹丸超高速撞击薄铝靶作了数值模拟。对于球形弹丸,通过对比实验结果和计算结果,二者吻合得较好,表明SPH方法能很好地模拟弹丸超高速碰撞问题及碎片云的形成过程。不同长径比的柱状弹丸45o斜碰撞碎片云前端均有一个近似锥形的突出,随着碰撞倾角的增大,突出的锥形前端逐渐消失,喷射角迅速增大,当碰撞倾角达到75o时绝大部分弹丸质量发生了跳弹。比较三种弹丸,长径比大的弹丸对靶板的破坏能力更强。In this paper, Tillotson EOS and Steinberg-Cochran-Guinan constitutive model are applied to obtain better computational results. The hypervelocity impacts of Al-sphere and Al-cylinder on Al-target are simulated by the so-called smooth particle hydrodynamics（SPH）. For the hypervelocity impact of Al-sphere on Al-target, the computational results are in accord with experimental results by the comparison between them. It shows that SPH solver will give good results for hypervelocity impacts and debris clouds. For three cylinders with different length to diameter ratios impact on debris clouds with angle of 45 degrees, the front of debris clouds extrudes a cone. With increasing the obliquity, the cone vanishes, the ejection degree increases gradually. When the obliquity reaches 75 degrees, the phenomena of ricochet arises. The simulated results show that the execution of the cylinder is stronger than that of spherical debris.

关 键 词：空间碎片 超高速碰撞 光滑粒子流体动力学 

分 类 号：O385[理学—流体力学]