ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The analytical evaluation and finite element methods are used to analyze the criticalstability of the shallow spherical roof of oil storage tank with an axial symmetrical corrosion region.At first, the nonlinear finite element method is adopted to calculate the global critical load of thestorage tank roof, and the local corrosion region is equivalent to a circular corrosion pit with uniformdepth. The results show that the tank wall and inner pressure of the stored oil have slight effects on thestability of the roof. To build the formula of local critical load of the tank roof, the circular corrosionpit is separated from the whole roof and treated as a shallow spherical shell which is elasticallysupported on the rest part of the roof. The equivalent support stiffness is obtained by the deformationcompatibility at the edge of the corrosion pit. The resulted nonlinear stability equation is solved witha modified iteration method to determine the local critical load. The local critical load for anin-service corroded oil tank roof is analyzed by the proposed approach and the results are comparedwith those calculated by the conventional nonlinear finite element method with good agreement andthe geometrical parameter of the corrosion region corresponding to the minimal critical load is 9.5
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.1463.pdf
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