Analysis and test for effect of structural adhesive shrinkage during curing on mirror surface

Liwei, 杨利伟 Yang; Zhi-lai, 李志来 Li; Dong-lin, 薛栋林 Xue

doi:10.3788/gxjs20144004.0307

Cited by 2 publications

(1 citation statement)

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“…Such a practice is relatively advantageous in qualitatively guiding the bonding structural optimization of small-aperture mirrors; however, it can lead to a design stiffness of support that is too low, resulting in launching risk for large-aperture mirrors with a relatively high requirement for surface shape precision and extremely harsh launching conditions. Yang et al 16 studied the influence of adhesive layer curing on the surface shape precision of the mirror, while they did not deduce all key parameters affecting the bonding stress. So, he gave limited adhesive bonding optimization measures, and did not form a full-link bonding design guideline.…”

Section: Introductionmentioning

confidence: 99%

Microstress bonding design of low-distortion mirror assembly

Sun

Chen

et al. 2022

Opt. Eng.

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To address the problem that bonding can lead to a reduction in the surface shape precision of a space-bound mirror, relationships between mirror deformation, thermal stress, and curing shrinkage stress were studied, and a bonding microstress design route was proposed. The thermal stress and thermal deformation introduced by thermal expansion mismatch were eliminated through an athermal adhesive layer thickness design. The relationship between mirror deformation and the curing shrinkage of the adhesive layer was derived completely, and structural optimization measures for releasing the curing stress of the adhesive layer are given. Bonding stress analysis was conducted based on the equivalent thermal deformation method, and an optimal structure meeting the design requirements was obtained. Finally, bonding of the mirror assembly was completed via this route, and the measured surface shape precision was stable at 0.0225λ. The theoretical analysis and experimental study demonstrate that this bonding design method can predict the bonding stress in the assembly process, making the follow-up bonding result controllable. These results should provide an excellent reference for the design and high-precision integration of large-aperture mirrors.

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Section: Introductionmentioning

confidence: 99%