Fracture response of pipelines subject to large plastic deformation under bending |
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| Affiliation: | 1. Department of Fracture Mechanics and Material Testing, SINTEF Material Technology, Trondheim, Norway;2. Department of Engineering Design and Materials, Faculty of Engineering Science and Technology, Norwegian University of Science and Technology, Trondheim 7491, Norway;1. Ghent University, Soete Laboratory, Technologiepark Zwijnaarde 903, 9052 Zwijnaarde, Belgium;2. University of Limerick, Department of Mechanical, Aeronautical and Biomedical Engineering, Materials and Surface Science Institute, Limerick, Ireland;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. Pipechina Southwest Pipeline Company, Chengdu, 610041, China;4. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing, 100124, China;5. Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada;1. Impact and Crashworthiness Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Edison Welding Institute, Structural Integrity, Columbus, OH 43221, USA;1. Department of Civil and Environmental Engineering, University of Massachusetts Amherst, 130 Natural Resources Road, Amherst, MA 01003, United States;2. Department of Civil and Environmental Engineering, University of Massachusetts Amherst, 130 Natural Resources Road, Amherst, MA 01003, United States |
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| Abstract: | Demand for long-distance offshore pipelines is steadily increasing. High internal pressure combined with bending/tension, accompanied by large plastic strains, along with the potential flaws in girth welds make the structural integrity of pipelines a formidable challenge. The existing procedures for the fracture assessment of pipelines are based on simplified analytical methods, and these are derived for a load-based approach. Hence, application to surface cracked pipes under large deformation is doubtful. The aim of this paper is to understand and identify various parameters that influence the fracture response of cracks in pipelines under more realistic loading conditions. The evolution of CTOD of a pipeline segment with an external circumferential surface crack is investigated under pure bend loading as well as bending with internal pressure. Detailed 3D elastic–plastic finite element simulations are performed. The effects of crack depth, crack length, radius-to-thickness ratio and material hardening on fracture response are examined. The results show that at moderate levels of CTOD, the allowable moment capacity of the pipe decreases significantly with increase in internal pressure. Further, the variation of CTOD with strain can be well approximated by a simple linear relationship. |
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