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One buckled specimen with four short cylindrical "bowed outward" segments

from Jan Blachut, Department of Mechanical Engineering, The University of Liverpool.

It looks as though this unique specimen buckled both as a column and locally.

See the paper: J. Blachut & P. Smith, "Static stability of barrelled shells under hydrostatic pressure" Proceedings ICPVT-10, July 7-10, 2003, Vienna, Austria

Also see the paper: J. Blachut, "Optimum barreling of steel shells via simulated annealing algorithm", Computers & Structures, Vol. 81 (2003), pp. 1941-1956

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