MINIMUM-WEIGHT ANALYSES FOR HONEYCOMB SANDWICH PLATES AND SHELLS.
LOCKHEED MISSILES AND SPACE CO SUNNYVALE CALIF
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Minimum-weight analyses and resultant design data are presented for flat plates subjected to edgewise compression, in-plane shear, or normal pressure, for circular cylinders subjected to uniform, external hydrostatic pressure, and for circular cones subjected to uniform, external hydrostatic pressure. Comparisons are made with the results of previous minimumweight analyses for other constructions. In all comparisons, the potential minimum structural weight of honeycomb-sandwich construction is shown to be considerably less than the minimum structural weight of other constructions under elastic stress conditions. In minimum-weight honeycomb-sandwich construction, elastic stress conditions are shown to be present only at very low loading indexes for most structural materials. Thus, for the majority of practical designs, minimum-weight honeycomb-sandwich facings are stressed to the maximum permissible stress. At high loading indexes where both minimum-weight conventional and honeycomb-sandwich constructions are stressed to the maximum permissible stress, conventional construction is more efficient due to the ineffectiveness of the honeycomb core in supporting the applied load directly. Author