Buckling of Shallow Spherical Caps Subjected to External Pressure

[+] Author and Article Information
J. Btachut

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

J. Appl. Mech 72(5), 803-806 (Feb 18, 2005) (4 pages) doi:10.1115/1.1993667 History: Received September 14, 2004; Revised February 18, 2005

This contribution details buckling tests and numerical results for shallow spherical caps subjected to static and uniform external pressure. Six mild steel caps were carefully CNC-machined from a solid billet. Three caps were designed to fail elastically with the remaining three failing within the plastic range. Caps’ shallowness parameter, λ, varied from 3.5 to 5.5, and radius-to-thickness ratio varied from 300 to 1800.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Geometry of spherical cap

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Figure 2

Joining arrangements between spherical shell and integral base flange

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Figure 3

Shape measuring table

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Figure 4

Section through the pressure vessel showing test arrangements (Fig. 4). Also, details of a cap fixing to the base (Fig. 4).

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Figure 5

Photograph of buckled spherical cap

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Figure 6

Plot of buckling load vs shallowness parameter, λ, for six values of slenderness, λ¯

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Figure 7

Plots of external pressure versus apex deflection. Note elastic behavior of models D1, D2, and D3 at the collapse; and magnitudes of first yield pressures for D4, D5, and D6.



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