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From:
Chris Moen (Virginia Tech( and Cheng Yu (University of North Texas),
“Elastic buckling of thin-walled structural components with stiffened holes”, 51st AIAA Structures, Structural Dynamics and Materials Meeting, April 2010.
There are various different kinds of buckling modes depending on the critical buckling axial wavelength. See the Prismatic Thin-Walled Structures section for another similar example of this phenomenon.
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