Nonlinear load-deflection curve and bifurcation buckling points for a spherical shell with an inward-directed point load

This slide shows comparison between test and theory for a spherical shell with the inward-directed normal concentrated load. As the load is increased the number of lobes in the non-axisymmetric pattern gradually increases. The prebuckling behavior is very nonlinear. These results are from BOSOR4 models.

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