bounds on interbay buckling

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Quick description about bounds on interbay buckling:

An Excel spreadsheet compares the following four bounds on the yield onset pressure due to Interbay imperfections in thin-wall monocoque and ring-stiffened cylindrical pressure vessels:

• Bodner-Berks method [1]
• Galletly-Bart method [2]
• Gordon’s simply supported method [3]
• Gordon’s clamped end method [3]

Because the first two methods are based on Donnell's equation of equilibrium, they are applicable only for shallow shells—that is for relatively short thin-wall cylinders whose critical buckling mode shapes are characterized by a large number of circumferential lobes. (Reference [1] claims greater than 8 lobes.) This restriction does not apply to the second two methods because they are based on Morley’s equation of equilibrium [4] rather than Donnell’s.

Technical documentation is included.


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