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1 June 2010 Composite mirror surface deformation due to lay-up sequences within quasi-isotropic laminates
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We address surface accuracy issues associated with the thermal stability of continuous-fiber-reinforced quasi-isotropic composite mirrors. Thermally induced surface deformations in /n quasi-isotropic laminates, where n=3, 4, and 6, are numerically and experimentally investigated for the effects of stacking sequence and surface resin layers. Symmetric laminates and asymmetric laminates caused by the presence of surface resin layers for fiber print-through (FPT) mitigation are considered in numerical models to evaluate the surface characteristics due to thermal variance of T=16.6 °C (30 °F). Numerical results from finite element analyses reveal that the presence of an out-of-plane sinusoidal surface deformation pattern is inevitable in quasi-isotropic laminates, and the surface patterns are associated with stacking sequences within the laminates. Analyses assuming the thermal variance reveal that none of the /n laminates meet the diffraction-limited surface deformation requirement (
©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
Kyung-Pyo Kim and Richard D. Hale "Composite mirror surface deformation due to lay-up sequences within quasi-isotropic laminates," Optical Engineering 49(6), 063002 (1 June 2010).
Published: 1 June 2010

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