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This is Fig. 17 from the 2009 GENOPT paper. This slide shows pressure-deflection curves corresponding to axisymmetric and non-axisymmetric collapse of optimized imperfect isogrid-stiffened equivalent ellipsoidal shells.
The linear bifurcation buckling modal imperfection shapes corresponding to non-axisymmetric collapse (the last three traces) are displayed in Figs. 7, 8, and 10 of the 2009 GENOPT paper.
In this case the –mode 1 (axisymmetric) buckling modal imperfection is predicted to be more harmful than the non-axisymmetric buckling modal imperfections with shapes given in Figs. 7, 8 and 10 of the 2009 GENOPT paper. This does not hold for the optimized unstiffened imperfect shell, as seen in Fig. 94 of the 2009 GENOPT paper.
In order to see figures referenced here but not shown here, please download the 2009 GENOPT paper from this website.
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