Plastic collapse of pipe bends under combined internal pressure and in-plane bending |
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| Affiliation: | 1. Reactor Safety Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India;2. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India;1. Paul Scherrer Institut, Nuclear Energy and Safety Department, Structural Integrity Group Forschungsstrasse 111, 5232 Villigen PSI, Switzerland;2. State Key Laboratory for Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;3. Paul Scherrer Institut, Nuclear Energy and Safety Department, Laboratory for Scientific Computing and Modelling, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland;1. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;2. Zhejiang Academy of Safety Science and Technology, Hangzhou 310012, China;1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China;2. Technology Research and Development Center, CNOOC Gas and Power Group Co., Ltd, Beijing, 100028, China;3. Oil and Gas Pipeline Engineering Research Center of AQSIQ, China Special Equipment Inspection and Research Institute, Beijing, 100029, China;4. Pipechina Southwest Pipeline Company, Chengdu, 610041, China;5. Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada |
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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. |
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