Buckling of Barreled Shells Subjected to External Hydrostatic Pressure

[+] Author and Article Information
J. Błachut, P. Wang

The University of Liverpool, Department of Engineering, Liverpool L69 3GH, UK

J. Pressure Vessel Technol 123(2), 232-239 (Nov 16, 2000) (8 pages) doi:10.1115/1.1357160 History: Received September 22, 2000; Revised November 16, 2000
Copyright © 2001 by ASME
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Geometry of cylindrical (a) and barreled (b) shells; both shells have the same mass
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Variation of bifurcation buckling pressure versus (Lo/Ro)-ratio for cylinders with the radius-to-thickness ratio, Ro/to, equal to 33, 50, and 100. Numerical predictions were obtained from BOSOR5. (For shell shapes at points A and B, see Figs. 3 and 4.)
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View of prebuckling shape and buckling modes in cylindrical shell for two (Lo/Ro)-ratios marked in Fig. 2 by A and B, i.e., Lo/Ro=2 and 4—(a) prebuckling (Lo/Ro=2); (b) n=5; (c) prebuckling (Lo/Ro=4); (d) n=4
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Deformed shape prior to buckling and the corresponding eigenmode for two cylindrical geometries—(a) prebuckling; (b) buckling mode (n=5),Pbif=5.95 MPa; (c) prebuckling; (d) buckling mode (n=4),Pbif=2.87 MPa
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Comparison of ABAQUS and BOSOR5 predictions of bifurcation and collapse loads for cylindrical shells
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Variation of the load carrying capacity in bowed-out cylinders for different values of the yield point of material
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Variation of buckling and collapse load for three (Lo/Ro)-ratios
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Amount of barreling at the optimum for shells with 0.5≤Lo/Ro≤5.0
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The influence of different boundary conditions, at the top and bottom edges, on the load-carrying capacity of barreled shells
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Variation of elastic and elastic-plastic buckling loads as a function of barreling, Δ/Ro
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Pre-buckling and buckling shapes of optimally shaped, elastic barrel—(a) prebuckling shape; (b) buckling mode Pbif=8.30 MPa(n=14)
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Imperfection sensitivity of elastic and plastic buckling pressures to initial, eigenmode-type, geometric imperfections



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