离子推进C/C栅极的设计与力学分析  

Structural design and mechanical analysis of C/C grids for ion thruster

作　　者：陈玥 李凯 彭雨晴 李爱军[3] 张东升[2] CHEN Yue;LI Kai;PENG Yuqing;LI Aijun;ZHANG Dongsheng(Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China;College of Sciences,Shanghai University,Shanghai 200444,China;Research Center of Composite Materials,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学上海市应用数学和力学所研究所,上海200072 [2]上海大学理学院,上海200444 [3]上海大学复合材料研究中心,上海200072

出　　处：《上海大学学报（自然科学版）》2019年第2期235-244,共10页Journal of Shanghai University:Natural Science Edition

基　　金：国家重点研发计划重大科学仪器设备开发专项资助项目(2018YFF0104200);国家自然科学基金面上资助项目(11672347)

摘　　要：为了合理设计离子电推进器C/C复合材料栅极,并有效掌握栅极的横向刚度变化规律,以10 cm离子电推进系统为应用对象,设计了C/C复合材料栅极的编织结构.利用ABAQUS软件,分别建立加速栅和屏栅的有限元模型,引入周期性边界条件,将非均匀的复合材料栅极均质化,分析了栅极组件特征单元体受载下的应力分布规律,并预测了其宏观等效材料参数.讨论了材料组分性能对整体栅极横向刚度的影响,并与现有钼栅极的力学性能进行比较.结果表明,采用C/C栅极取代钼栅极的设计方法是可行的. C/C栅极的横向刚度取决于碳纤维的拉伸模量和基体的弹性模量,可选取更高拉伸模量的碳纤维提高栅极横向刚度.To design C/C grids for the ion thruster and estimate lateral stiffness of the C/C grids,the mechanical behavior of C/C composite grids is studied based on the geometry of molybdenum grids.Finite element models of acceleration and screen grids are established using ABAQUS.By introducing a periodic boundary condition,a homogeneous model is established to analyze the stress distribution and mechanical properties of the representative volume element.The effect of mechanical properties of the composite components on global lateral stiffness of the grids is then discussed,and compared with molybdenum grids.The results show that global lateral stiffness of C/C grids is a function of tensile modulus of the carbon fiber and the modulus of matrix.Higher tensile modulus of carbon fiber can be selected to improve lateral stiffness of C/C grids.

关 键 词：离子推进器 栅极组件 C/C复合材料 有限元分析 

分 类 号：V439.4[航空宇航科学与技术—航空宇航推进理论与工程]