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- W2000361621 abstract "The U.S. Air Force, as well as many other organizations, has evinced considerable interest in developing large gossamer membrane radio antennas and optical quality telescopes. A concept is discussed of global shape maintenance of a reflective polymer membrane element after curing, coating, and release from a precision casting mold of the desired parabolic shape. The idea involves manipulation of intrinsic stresses in the coating and its membrane substrate. Results from an axisymmetric, geometrically linear, shallow-shell theory are presented as closed-form solutions for the displacement fields. A unique condition emerges from these solutions, suggesting that zero deformations can occur in a 0-g environment. Results of a finite element analysis are presented, showing that if a coated membrane satisfying this condition is subjected to a 1-g loading, rms errors of 9.3 µm and 2.8 mm can be expected fo r1 -and 20-m-diam mirrors, respectively. However, in the case of a 1-g load, another condition follows from the theory, which, if met, predicts zero deformation in the 1-g environment. Additional results of the finite element analysis are presented that lend support to these conclusions." @default.
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- W2000361621 date "2004-07-01" @default.
- W2000361621 modified "2023-10-18" @default.
- W2000361621 title "Shape Achievement of Optical Membrane MirrorsUsing Coating/Substrate Intrinsic Stresses" @default.
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- W2000361621 doi "https://doi.org/10.2514/1.11936" @default.
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