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From the website:
http://www.fgg.uni-lj.si/kmk/esdep/master/wg06/l0300.htm
Lecture 6.3: Elastic Instability Modes, Course ESDEP WG 6: Applied Stability,
The teacher writes:
"The fundamental differences in behaviour of columns, plates and shells are shown in this figure. For behaviour in the elastic range the critical load and the maximum load carried by an actual (imperfect) column are in reasonable agreement. For the plate, if the postcritical strength is achieved with acceptably small lateral deflections, a greater load than the critical load might be acceptable. For thin-walled cylinders, however, the maximum load in the real (imperfect) situation is much less than the theoretical critical load."
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