Computer Science – Numerical Analysis
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987spie..748..158m&link_type=abstract
IN: Structural mechanics of optical systems II; Proceedings of the Meeting, Los Angeles, CA, Jan. 13-15, 1987 (A88-34486 13-74).
Computer Science
Numerical Analysis
Computer Aided Design, Low Density Materials, Mirrors, Sandwich Structures, Weight Reduction, Modulus Of Elasticity, Numerical Analysis, Stiffness Matrix, Thermal Stresses
Scientific paper
One of the key parameters usually considered in a light weighted mirror design is its flexural rigidity. In part I of this paper, the relative merits of symmetric sandwich and open back light-weighted designs in the 10 to 30 kg/sq m range (of mirror weight per unit area) are examined for ULE, Heraeus fused silica, Zerodur and beryllium, subject to some representative state-of-the-art fabrication constraints. Part II of the paper addresses the same issue independently of any specific material. This is made possible by normalization of several parameters by the weight equivalent solid thickness of the mirror. Also included in the study are nonsymmetric sandwich cross sections with unequal front and rear facesheet thicknesses. The study shows that, for given values of mirror weight per unit area and the core (or rib) solidity ratio, there exists a transitional value of the normalized front facesheet thickness above which an open back configuration is structurally superior to a sandwich configuration. Moreover, for the increasingly demanding light-weighting goals of modern optical systems, the optimum geometrical configurations may be beyond the fabrication capability of the current state of the art.
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