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RELIABILITY OF COMPOSITE ZERO-EXPANSION STRUCTURES FOR USE IN ORBITALENVIRONMENT,
Composite sandwich structures, composed of graphite-epoxy face sheetson aluminum honeycomb core, were found to successfully withstand 15000 thermalcycles between -250 and 150 F (-157 and 66 C) in vacuum. Although thermalcycling induced microcracking in the face sheets, laminate flexural and tensileproperties were unaffected, and the only noticeable effect was on thecoefficient of thermal expansion and flatwise tensile strength of the sandwich.In addition, exposure of the structure to 95 percent relative humidity resultedin a finite change in dimensions, but no effect on the coefficient of thermalexpansion. (Author, modified).
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