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Buckling Pressures on Shallow Spherical Sandwich Shells Made of Fiberglass Fabric (1)

Experimental investigation was carried out to determine the critical buckling loads of several shallow spherical sandwich shells. A cold forming process simultaneously using pressure and vacuum was employed to manufacture the nearly perfect spherical facing layers from aluminum alloy sheets. Eight shallow spherical shell specimens. Thickness of fiberglass fabric have been tested in autoclave specifically designed for these experiments. The pressure on shells was developed by the differential pressure between the inner and the outer chambers separated by the shell being tested. When the inner chamber was maintained at atmospheric pressure and gas pressure was applied in the outer chamber, the testing procedure was termed.