Propagating buckles in corroded pipelines |
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Authors: | Michelle S Hoo Fatt Jianghong Xue |
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Institution: | Department of Mechanical Engineering, The University of Akron, Akron, OH 44325-3903, USA |
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Abstract: | Rigid–plastic solutions for the steady-state, quasi-static buckle propagation pressure in corroded pipelines are derived and compared to finite element predictions (ABAQUS). The corroded pipeline is modeled as an infinitely long, cylindrical shell with a section of reduced thickness that is used to describe the corrosion. A five plastic hinge mechanism is used to describe plastic collapse of the corroded pipeline. Closed-form expressions are given for the buckle propagation pressure as a function of the amount of corrosion in an X77 steel pipeline. Buckles that propagate down the pipeline are caused by either global or snap-through buckling, depending on the amount of corrosion. Global buckling occurs when the angular extent of the corrosion is greater than 90°. When the angular extent is less than 90° and the corrosion is severe, snap-through buckling takes place. The buckle propagation pressure and the corresponding collapse modes also compare well to finite element predictions. |
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Keywords: | Buckle propagation Corroded pipelines Rigid–plastic analysis Finite element solutions |
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