摘要
卫星推进剂贮箱的焊接质量直接影响卫星的寿命和可靠性。文章通过仿真分析研究焊接残余应力对贮箱上已存在裂纹的影响。首先针对球壳模型和平板模型分别计算焊接残余应力,然后在应力强度值最大的危险区域引入裂纹,对不同角度和尺寸系数的裂纹对应力强度因子影响的数值和变化趋势进行分析。研究表明:起主要作用的是应力强度因子KⅠ;KⅡ受角度影响相对较大;KⅠ和KⅡ的最小值都在裂纹中心处;KⅢ基本随归一化裂纹前沿数值增加而增加。
The welding quality of the propellant tank has a significant effect to the life and the reliability of satellites. To study the influence of the residual welding stress on the fatigue crack on the tank, the welding residual stress is first calculated with a spherical and a planer model, respectively. The stress intensity factors of three kinds are introduced to investigate the relations between the shape factors of the crack on the most vulnerable area with the highest stress intensity. The values and the variation trend of the crack’s stress intensity factors against the crack morphology are obtained. It ’s shown that among the three SIFs, KI plays a most important role;KⅡ is subjected more to the crack angle;the value of KⅠ and KⅡ both reaches its minimum at the center of the crack;and the value of KⅢ basically increases with the normalized front of the crack.
作者
赵颖
黄美(指导)
杨梦灵
韩然
ZHAO Ying;HUANG Mei;YANG Mengling;HAN Ran(Nuclear Science and Engineering, North China Electric Power University, Beijing 102206, China;Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China)
出处
《航天器环境工程》
2019年第3期247-251,共5页
Spacecraft Environment Engineering
基金
北京卫星环境工程研究所创新基金项目(编号:CAST-BISEE 2018-002)
关键词
卫星
表面张力贮箱
焊接疲劳裂纹
应力强度因子
数值分析
satellite
surface tension tank
welding fatigue crack
stress impact factor (SIF)
numerical analysis
作者简介
赵颖(1995—),女,硕士研究生,研究方向为热工水力。E-mail:928825408@qq.com;指导教师:黄美(1965-),女,教授,研究方向为结构静动态分析及高能算法。E-mail:huangmei@ncepu.edu.cn。
