Volume 9 Issue 6
Nov.  2016
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LI Meng-qing, ZHANG Lei, XING Li-na, LI Zong-xuan. Optimization design of athermal adhesive for rectangular space mirror[J]. Chinese Optics, 2016, 9(6): 704-712. doi: 10.3788/CO.20160906.0704
Citation: LI Meng-qing, ZHANG Lei, XING Li-na, LI Zong-xuan. Optimization design of athermal adhesive for rectangular space mirror[J]. Chinese Optics, 2016, 9(6): 704-712. doi: 10.3788/CO.20160906.0704

Optimization design of athermal adhesive for rectangular space mirror

doi: 10.3788/CO.20160906.0704
Funds:

Supported by National High-tech R&D Program of China No.2012AA121502

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  • Corresponding author: E-mail:18686344285@163.com
  • Received Date: 08 Jun 2016
  • Rev Recd Date: 12 Aug 2016
  • Publish Date: 01 Dec 2016
  • In order to realize the athermal assembling of rectangular special mirror with large dimension of 1 200 mm×485 mm, and reduce the effect of hot stress on primary mirror's surface figure precision, the effect of epoxy thickness on the surface figure accuracy of the mirror and the stress of epoxy under static and dynamic conditions are researched. First of all, several already existing athermal adhesive thickness equations obtained based on Hooke's law are introduced. The athermal adhesive thickness equations of the primary mirror which has blind holes with taper in the back is developed, and the curve of athermal adhesive thickness is obtained. Then six modes of mirror with different adhesive thickness are made. The result of analysis shows that the mirror's RMS are 0.0178λ(optical value) and 0.0173λ(gravity in detecting's directions) under 5℃ uniform temperature rise when the epoxy thickness is 0.07 mm. Finally, vibration tests of mirror components and drawing test of epoxy are conducted. Analysis and experiment results indicate that its first order frequency is 216.4 Hz and the error between them is 1.71%. The maximum stress of epoxy under dynamic conditions is smaller than the shear strength which is 30.2 MPa, obtained through drawing test of Epoxy, and the safety margin is 2.46. All indicators meet the design requirements.

     

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