Journal
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
Volume 85, Issue -, Pages 205-216Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2023.10.012
Keywords
Adhesive bonding; Surface-figure; Viscoelastic constitution; Bonding stresses; Curing-induced stresses
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A comprehensive finite-element model was developed in this paper to study the evolution of surface figure in high-precision bonded mirrors. The cure kinetics and mechanical behaviors of the optical adhesive were experimentally examined and modeled, and the effects of environmental factors on the surface-figure accuracy and stability were further investigated.
Adhesive bonding is widely used in the assembly of high-precision optomechanical products. However, of the curing and relaxation behaviors as well as environmentally sensitive features of adhesives, the surface-figure accuracy of bonded mirrors is often attenuated, which greatly degrades the performances of the optomechanical system. This paper developed a comprehensive finite-element model for understanding the evolution of surface figure in a high-precision bonded mirror. For the used optical adhesive, its cure kinetics was experimentally examined by differential scanning calorimetry and then modeled based on a modified Kamal kinetic model, and its mechanical behaviors were described by a viscoelastic constitutive model including temperature, moisture, and degree of cure. Additionally, time-temperature/moisture/curing superposition principles for the adhesive were experimentally determined and embedded into the constitutive model. The comprehensive finiteelement model was verified and then applied to simulate the surface-figure evolution of the bonded mirror. The effects of environmental factors, such as temperature, environmental pressure, and moisture, on the surfacefigure accuracy and stability were further understood.
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