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Curing shrinkage stress and deformation analysis of adhesive bonding large aperture mirror
Sun, Li-Jun; Li, Li-Bo; Li, Si-Yuan; Zhao, Qiang; Sun, Jian; Wu, Jun-Qiang; Hu, Bing-Liang
2019
Conference Name9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, AOMATT 2018
Source Publication9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Volume10837
Conference Date2018-06-26
Conference PlaceChengdu, China
PublisherSPIE
Contribution Rank1
AbstractThe influence of adhesive bonding and curing on the accuracy of mirror surface shape was analyzed to realize low-stress assembly of large aperture mirror. Firstly, based on Hooke's law, a curing shrinkage stress equation was deduced, taking deformation of the mirror and support structure into account under the boundary condition of continuous edge bond, and key parameters effecting mirror deformation were obtained. Secondly, for a 514mm ULE spectrometer primary mirror with an inserts structure mosaiced and bonded on mirror-back, an equivalent linear expansion coefficient method was used for finite element modeling. The shrinkage stress at the bond edge of mirror and the mirror surface shape were analyzed. It's found that adhesive shrinkage has a significant effect on the mirror surface shape. Finally, the inserts structure of mirror assembly was optimized. In contrast to the non-optimum structure, the average stress of adhesive surface caused by adhesive curing shrinkage reduced from 0.28MPa to 0.18MPa, and the mirror surface shape (Root Mean Square, RMS) reduced from 0.029λ to 0.017λ. Finite element analysis results of the mirror assembly were given at last, surface shape accuracy (RMS) of mirror is 0.012λ under a load case of 1g gravity, and the first-order natural frequency of the component is 216 Hz. The obtained results showed that a suitable optimized support structure can effectively relieve adhesive curing stress, and also satisfy the design requirements for both the static and dynamic stiffness. © 2019 SPIE.
Department光谱成像技术实验室
DOI10.1117/12.2505710
Indexed ByEI
ISBN9781510623163
Language英语
ISSN0277786X;1996756X
EI Accession Number20190506432459
Citation statistics
Document Type会议论文
Identifierhttp://ir.opt.ac.cn/handle/181661/31225
Collection光谱成像技术实验室
AffiliationXi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China
Recommended Citation
GB/T 7714
Sun, Li-Jun,Li, Li-Bo,Li, Si-Yuan,et al. Curing shrinkage stress and deformation analysis of adhesive bonding large aperture mirror[C]:SPIE,2019.
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