The objective of this paper is to derive analytical solutions for buckle propagation and fracture of a pipeline subjected to hydrostatic pressure. Rigid-plastic approximations are used to determine the plastic deformation of the pipeline. Because the transition zone of buckle propagation occurs over a finite region, the plastic collapse of a pipeline of finite length is first considered. The deformation model for the finite-length pipe is then extended to buckle propagation in pipelines of infinite length. Closed-form solutions for the steady-state buckle propagation pressure are derived by considering plastic work dissipation due to both circumferential bending and longitudinal stretching. Analytical predictions of the propagation pressure are within 5% of the experimental data on mild steel pipes. The present model is an improvement over previous analytical solutions, in which the longitudinal stretching resistance of the pipeline was ignored. It has been found that the plastic work due to longitudinal stretching accounts for 20% to 30% of the propagation pressure in the pipelines considered in this study. Finally, approximations of the maximum strains are made from the assumed deformation field. Fracture criteria based on the uniaxial rupture strain or the combinations of biaxial rupture strains are suggested to predict cracks in the pipe.
Buckle propagation and fracture in pipelines
International Journal of Offshore and Polar Engineering ; 9 , 1 ; 30-38
1999
9 Seiten, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
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