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This slide shows buckled ring-stiffened cylindrical shells that were subjected to external hydrostatic pressure.
The specimen on the left was fabricated by first rolling a flat sheet into a cylindrical shell, letting it spring back to an equilibrium state, and then welding external rings onto the cylindrical shell. The specimen on the right was machined.
In these specimens critical buckling was local buckling between rings, without (left) and with (right) some deformation of the rings in the critical buckling mode.
These shells were analyzed with BOSOR5 (elastic-plastic buckling of shells of revolution, D. Bushnell, 1970’s and early 1980’s).
(Photographs by Slankard and colleagues at the David Taylor Model Basin, 1956)
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