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Publications
Kaveh, M. and Guedes Soares, C. (2021), “Structural integrity of offshore pipelines considering buckling and fracture limit-states”, Developments in Maritime Technology and Engineering, Guedes Soares, C. & Santos T.A., (Eds.), Taylor and Francis, London, UK, Vol 1, pp. 697-704.
Nonlinear elastic-plastic finite element analyses are performed to investigate the effect of fracture assessment at circumferential girth welds and buckling along the pipes between welded joints at various strains from elastic to large plastic zones. Based on the simulation performed, it was found that while for strains located in the elastic region it was not necessary to consider the buckle mitigating constrains, for large strains of up to 1.5%, there is a need to provide buckle restraints in the middle of the pipe. In addition, it is observed that as the strain increases, the average acceptable defect lengths at girth weld showed decreasing trend. Furthermore, it is concluded that in severe plastic strains larger than 1.5%, structural integrity of pipelines will not be influenced by buckle or fracture limit states and the plastic collapse failure mode will be the main cause of failure.
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