from Jan Blachut, Department of Mechanical Engineering, The University of Liverpool.
The buckling behavior occurs in only one of the two segments of each specimen. The buckling mode resembles that displayed three slides ago for the hydrostatically compressed specimen with one "bowed outward" segment.
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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