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Front. Astron. Space Sci.
Sec. Astronomical Instrumentation
Volume 11 - 2024 | doi: 10.3389/fspas.2024.1406090

Hetero-bonding strength investigation into opto-mechanical interface Provisionally Accepted

 Haifei Hu1* Di Zhou1 Chenchen Zhao2 Erhui Qi1 Xiao Luo1
  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (CAS), China
  • 2Changchun Vocational Institute of Technology, China

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Glass-metal hetero-bonding through optical epoxy adhesive is frequently used in opto-mechanics and requires high stability. However, the bonding stability is difficult to achieve and predict in massive use cases, where dozens to thousands of metal pads are bonded to mount large optics. Here a universal adhesive bonding technology was proposed and evaluated through reliability analyses based on a limited number of sample tests. Specimens were prepared and tested via standard procedures and equipment; afterward, the lower strength limits were calculated with high reliability. Nominal tensile (6.7 MPa) and shear (4.3 MPa) strength limits at 99.95% reliability were expected for ongoing 30 m aperture telescopes. This study may improve the quality of opto-mechanical interfaces and reduce the risk on constructing extremely large telescopes.

Keywords: Large aperture optics, Metal-glass bonding, opto-mechanical interface, Epoxy bonding, Strength stability, safety factor

Received: 24 Mar 2024; Accepted: 22 Apr 2024.

Copyright: © 2024 Hu, Zhou, Zhao, Qi and Luo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mx. Haifei Hu, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (CAS), Changchun, China