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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。
Space camera optics and structural parts assembly, usually using adhesive bonding process. XM23 plastic as a common adhesive, the Young’s modulus directly affects the module fundamental frequency and optical unloading thermal stress, the ability to assemble stress, thereby affecting the optical system performance. The existing engineering examples show that the Young’s modulus of XM23 glue fluctuates within a certain range. Judging from the test data currently available, this value is between 1.2 and 3.0 MPa, so it is necessary to measure the Young’s modulus before each application. In this paper, the tensile specimen is designed first, and the nominal modulus of the sample is obtained through the processing of the tensile test data. Secondly, the nominal modulus is converted into real modulus by finite element method, (GF-2) satellite camera model to verify the data. Thirdly, the general method of XM23 glue selection is given in the design of the structure. Finally, through the comparison test, it is found that the Young’s modulus of different batches of glue Changes, the same batch of plastic in the storage period, with the growth of Young’s modulus will continue to decline, the ratio of accelerators have no effect on Young’s modulus, the use of this feature can shorten the product development time.