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The load-carrying capacity of an externally pressurized thin monocoque spherical shell behaves analogously to that of a thin cylindrical shell under uniform axial compression.
As with the buckled axially compressed thin cylindrical shell displayed two slides ago, there are many, many buckles over the entire surface of the shell, the characteristic size of which is very small compared to the dimensions of the test specimen.
(In this photograph the post-buckling pattern is “artificially” stabilized because there is a solid mandrel inside the shell).
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