Mechanical analysis of C/C composite grids in ion optical system

doi:10.1007/s10483-019-2527-9

Applied Mathematics and Mechanics (English Edition) ›› 2019, Vol. 40 ›› Issue (11): 1589-1600.doi: https://doi.org/10.1007/s10483-019-2527-9

Mechanical analysis of C/C composite grids in ion optical system

Shuiqiang ZHANG^1,2, Aijun LI³, Yuqin ZHENG¹, Dongsheng ZHANG^2,4

1. School of Engineering, Huzhou University, Huzhou 313000, Zhejiang Province, China;
2. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, China;
3. Research Center for Composite Materials, Shanghai University, Shanghai 200444, China;
4. Department of Mechanics, Shanghai University, Shanghai 200444, China

收稿日期:2018-12-23 修回日期:2019-05-19 出版日期:2019-11-01 发布日期:2019-10-28
通讯作者: Dongsheng ZHANG E-mail:donzhang@staff.shu.edu.cn
基金资助:
Project supported by the National Key R&D Program of China (No. 2018YFF01014200) and the National Natural Science Foundation of China (Nos. 11727804, 11672347, and 51732008)

Mechanical analysis of C/C composite grids in ion optical system

Shuiqiang ZHANG^1,2, Aijun LI³, Yuqin ZHENG¹, Dongsheng ZHANG^2,4

1. School of Engineering, Huzhou University, Huzhou 313000, Zhejiang Province, China;
2. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, China;
3. Research Center for Composite Materials, Shanghai University, Shanghai 200444, China;
4. Department of Mechanics, Shanghai University, Shanghai 200444, China

Received:2018-12-23 Revised:2019-05-19 Online:2019-11-01 Published:2019-10-28
Contact: Dongsheng ZHANG E-mail:donzhang@staff.shu.edu.cn
Supported by:
Project supported by the National Key R&D Program of China (No. 2018YFF01014200) and the National Natural Science Foundation of China (Nos. 11727804, 11672347, and 51732008)

摘要/Abstract

摘要： The ion thruster is an engine with high specific impulse for satellites and spacecrafts, which uses electric energy to boost the spacecraft. The ion optical system, also known as gate assemblies which consist of acceleration and screen grids, is the key component of the ion thruster. In this paper, the static mechanical properties of the C/C composite grids are evaluated based on the structural design. Representative volume element (RVE) is adopted to simplify the braded composite structure as a continuum material. The dynamical behavior of the 100 mm ion thruster optics in the launch environment (1 000g shock-load) is numerically modeled and simulated with the half-sine pulse method. The impact response of the C/C and molybdenum gate assemblies on the stress distribution and deformation is investigated. The simulated results indicate that the magnitudes of the normal displacement of the composite grids subject to the uniformly distributed load are on the same level as molybdenum grids although the normal stiffness of the composite grids is much smaller. When subject to impact loading, the stress distribution in the C/C composite grids is similar to molybdenum grids while the stress magnitude is much smaller. This finding shows that the C/C gate assemblies outperform molybdenum grids and meet the requirement of long lifetime service in space travel.

关键词: ion optical system, C/C composite, grid, mechanical analysis

Abstract: The ion thruster is an engine with high specific impulse for satellites and spacecrafts, which uses electric energy to boost the spacecraft. The ion optical system, also known as gate assemblies which consist of acceleration and screen grids, is the key component of the ion thruster. In this paper, the static mechanical properties of the C/C composite grids are evaluated based on the structural design. Representative volume element (RVE) is adopted to simplify the braded composite structure as a continuum material. The dynamical behavior of the 100 mm ion thruster optics in the launch environment (1 000g shock-load) is numerically modeled and simulated with the half-sine pulse method. The impact response of the C/C and molybdenum gate assemblies on the stress distribution and deformation is investigated. The simulated results indicate that the magnitudes of the normal displacement of the composite grids subject to the uniformly distributed load are on the same level as molybdenum grids although the normal stiffness of the composite grids is much smaller. When subject to impact loading, the stress distribution in the C/C composite grids is similar to molybdenum grids while the stress magnitude is much smaller. This finding shows that the C/C gate assemblies outperform molybdenum grids and meet the requirement of long lifetime service in space travel.

Key words: ion optical system, C/C composite, grid, mechanical analysis

中图分类号:

74R99

Shuiqiang ZHANG, Aijun LI, Yuqin ZHENG, Dongsheng ZHANG. Mechanical analysis of C/C composite grids in ion optical system[J]. Applied Mathematics and Mechanics (English Edition), 2019, 40(11): 1589-1600.

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Mechanical analysis of C/C composite grids in ion optical system

Mechanical analysis of C/C composite grids in ion optical system

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