摘要
空间相机光学件与结构件装配时,通常使用胶接的工艺方法。XM23胶作为常用的胶接剂,其杨氏模量直接影响组件基频以及光学件卸载热应力、装配应力的能力,进而影响光学系统的性能。已有的工程实例表明,XM23胶的杨氏模量会在一定的范围内波动。从目前掌握的试验数据看,此数值在1.2~3.0MPa之间,所以需要在每次用胶前对其杨氏模量进行测定。文章首先设计了拉伸试验试件,通过对拉伸试验数据的处理获得胶样的名义模量;其次,通过有限元方法将名义模量换算为真实模量,并利用"高分二号"(GF-2)卫星相机模型对此数据进行校验;再次,给出了结构设计时,XM23胶选用的一般方法;最后,通过对比试验发现,不同批次胶的杨氏模量会变化,同一批次胶在储存期内,随着时间的增长杨氏模量会不断下降,促进剂的配比对杨氏模量没有影响,利用此特点可以缩短产品的研制时间。
Bonding technique is frequently used in assembly of optical components and structures. XM23 glue is a common adhesive whose Young＇s modulus directly affects the base frequency of the components, the reloading of thermal stress and assembly stress, finally influences the optical system performance. Engineering examples show the Y0ung＇s modulus of XM23 fluctuates from 1.2MPa to 3MPa, so the determination of XM23＇s Young＇s modulus before using is necessary. In this paper, firstly, an extension experiment sample is designed and nominal modulus is obtained from experiment data processing. Secondly, nominal modulus is converted to real modulus via FEA method and corrected by GF-2 camera model. Thirdly, choosing principle of XM23 glue in structural design is given. Finally, a series of contrast experiments demonstrate the Young＇s modulus changes for diverse batches and periods, but the influence of accelerator ratios is slight.
出处
《航天返回与遥感》
CSCD
北大核心
2017年第2期48-54,共7页
Spacecraft Recovery & Remote Sensing
基金
国家重大科技专项工程
关键词
室温硫化胶
杨氏模量
拉伸试验
有限元仿真
空间相机
room temperature vulcanization
Young＇s modulus
extension experiment
finite element simulation
space camera
