粘结连接在望远镜主镜支撑中应力分散作用研究

摘要

Support and the surface of the mirror connection and primary mirror is one of the key technologies of large telscope. The connection can derectly effect the telescope image quality. Compared to the mechnical conncetion, the bond connection is lighter, cheaper and easier fixed. And the bond layer has stress dispersion effect. In the past, the study of bond connection was mainly on the bond strength. In this article, the stress dispersion effect of bond connection was studied systermly. The analysis methord of Mutiply mirror telescope (MMT) was borrowed. And the pressure concentration factor (PCF) was used to value the stress dispersion effecet. The influence of bond module and thickness to PCF was also studied.%支撑与镜面的连接是大型望远镜主镜支撑的关键技术之一,连接的好坏直接影响望远镜的成像质量.相比于机械紧固方式,粘结连接具有重量轻、成本低、易于装配等优点,常被用来作为支撑和主镜的连接方式.而硅橡胶粘结剂在固化后模量较低,因此硅橡胶粘结层还具有分散应力的作用.过去对主镜粘结研究主要集中在粘结强度方面,而对其他性能研究较少.本文使用有限元方法对粘结层的力分散作用进行了系统研究,借鉴了MMT望远镜的分析方法,通过计算应力分散因子PCF来评价粘结层的应力分散能力,并分析了粘结层模量、厚度等对力分散作用的影响.