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Plastic collapse of pipe bends under combined internal pressure and in-plane bending

Robertson, A.C. and Li, H. and Mackenzie, D. (2005) Plastic collapse of pipe bends under combined internal pressure and in-plane bending. International Journal of Pressure Vessels and Piping, 82 (5). pp. 407-416. ISSN 0308-0161

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Abstract

Plastic collapse of pipe bends with attached straight pipes under combined internal pressure and in-plane closing moment is investigated by elastic–plastic finite element analysis. Three load histories are investigated, proportional loading, sequential pressure–moment loading and sequential moment–pressure loading. Three categories of ductile failure load are defined: limit load, plastic load (with associated criteria of collapse) and instability loads. The results show that theoretical limit analysis is not conservative for all the load combinations considered. The calculated plastic load is dependent on the plastic collapse criteria used. The plastic instability load gives an objective measure of failure and accounts for the effects of large deformations. The proportional and pressure–moment load cases exhibit significant geometric strengthening, whereas the moment–pressure load case exhibits significant geometric weakening.

Item type: Article
ID code: 5065
Keywords: pipe bend, plastic collapse criterion, plastic instability, geometric non-linearity, Mechanical engineering and machinery, Mechanics of Materials, Materials Science(all), Mechanical Engineering
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Strathprints Administrator
Date Deposited: 05 Jan 2008
Last modified: 21 Jul 2015 14:45
Related URLs:
URI: http://strathprints.strath.ac.uk/id/eprint/5065

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