Design of Composite Surrogate Mirror Support Structure
Publication: Journal of Aerospace Engineering
Volume 14, Issue 3
Abstract
Three multimaterial support structures were designed and built to support 200 mm (8 in.) diameter “surrogate” mirrors for the deployable optical telescope (DOT) ground experiment at the Air Force Research Laboratory (AFRL/VS). A “spider-truss” structure was selected for its stiffness. Materials used included “Invar” alloy and AS4-epoxy composite rods manufactured by the “pultrusion” process, for their low thermal expansion coefficients, and aluminum for its machinability and low density. The composite rods were pultruded at AFRL/VS, and their coefficients of thermal expansion (CTE) were determined by a laser interferometry method. Finite-element method (FEM) analysis of the vibration modes of the structure was conducted to determine the optimum selection of materials. FEM analyses were also used to determine the mirror surface figure errors caused by ±5°C temperature fluctuation, as a function of the materials chosen. The paper discusses the rationale for the materials selection and design issues.
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References
1.
Daniel, I. M., and Ishai, O. ( 1994). Engineering mechanics of composite materials, Oxford University Press, Oxford, U.K.
2.
Hariharan, P. ( 1992). Basics of interferometry, Academic Press, Boston.
3.
Maji, A. K., Acree, R., Satpathi, D., and Donnelly, K. (1997). “Evaluation of pultruded FRP composites for structural applications.”J. Mat. in Civ. Engrg., ASCE, 9(3), 154–158.
4.
Maji, A. K., Acree, R., and Sanchez, L. ( 1999). “Processing variables and their effect on pultruded composites.” SAMPE J. Adv. Mat., 31(4).
5.
Sumerak, J. E. ( 1997). “The pultrusion process for continuous automated manufacture of engineered composite profiles.” Composites engineering handbook, Marcel Dekker, New York.
6.
Schott MLQ Fused Silica Database. ( 2001). 〈www.schott.de/english/ml/produktinformation/fused _silica.htm?e=N〉.
Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 14 • Issue 3 • July 2001
Pages: 112 - 118
History
Received: Jan 3, 2000
Published online: Jul 1, 2001
Published in print: Jul 2001
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