Collapse Tests on Externally Pressurized Toroids

[+] Author and Article Information
J. Błachut

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

J. Pressure Vessel Technol 125(1), 91-96 (Jan 31, 2003) (6 pages) doi:10.1115/1.1522417 History: Revised August 29, 2002; Revised September 29, 2002; Online January 31, 2003
Copyright © 2003 by ASME
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Section through spun toroid with top and bottom halves welded together (a); planar view of a toroid made by welding four, 90 deg, elbows (b,c)
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Typical stress-strain curve for mild steel (obtained from 1.97 mm thick flat test coupon)
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Bifurcation and collapse pressures for toroidal shell with circular cross section and r/t=18.74. The effect of two values of the yield point of mild steel, i.e., 194.8 and 400 MPa on the load-carrying capacity is shown.
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Deformed shape just prior to buckling and the corresponding eigenmode for R/r=5 (a,b), and for R/r=15 (c,d). Other values are: r/t=18.74,σyp=194.8 MPa. Note: Deformations are not to scale.
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Deformed shape at the collapse for R/r=5 (a), and for R/r=15 (b). Note: Deformations are not to scale.
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View of spun halves for TS1 shell
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Spun toroidal shell after welding and attachment of two nozzles
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Distribution of average, minimum and maximum values of the wall thickness in TS1, TS2, and TE1 toroidal shells
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View of stainless steel toroidal shell, TE1, being lowered to pressure tank for testing
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Toroidal shell, TE1, after collapse
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View of spun toroids, (a) TS1 and (b) TS2, after collapse
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Computed bifurcation buckling and collapse characteristics for two (r/t)-ratios




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