Combination Rules For External Volumetric Flaws In A Pressurised Cylinder Subject To External Bending

Bezensek, B. and Duguid, L. (2009) Combination Rules For External Volumetric Flaws In A Pressurised Cylinder Subject To External Bending. In: O'Dowd, N.P. (ed.) Proceedings of the ASME Pressure Vessels and Piping Conference. ASME: New York, pp. 1033-1040. ISBN 978-0-7918-4829-6

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Abstract

The pressure-moment (p-M) diagram of Konosu [1,2] provides an inexpensive method for evaluating fitness for service of internally pressurised cylinders containing volumetric flaws (local thin areas) subject to external bending moment. This work examines the use of the recommended flaw combination rules for volumetric flaws of the ASME Boiler and Pressure vessel code Section XI [3] and Ibaraki fitness-for-service code (4] with the pressure - moment method. Investigation is performed for a thin-wall vessel containing two external volumetric flaws with flaw depths ranging from 25 to 75 percent of the wall thickness under a range of internal pressures. Assessment based on the plastic initiation moments shows that the adjacent flaws are conservatively assessed as single flaws using the above codes' rules when flaw depths of both flaws do not exceed 60 percent of the wall thickness. This restriction is relaxed to 75 percent of the wall thickness when assessment is performed using the twice elastic slope (TES) collapse moments

Item Type:Book Sections
Additional Information:ASME Presure Vessels and Piping Conference 2008 Chicago, IL, JUL 27-31, 2008
Status:Published
Glasgow Author(s) Enlighten ID:Bezensek, Dr Bostjan
Authors: Bezensek, B., and Duguid, L.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Publisher:ASME
ISBN:978-0-7918-4829-6

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