Abstract
In the conventional method of analysis for the remaining strength assessment of a corroded pipeline, von Mises failure criterion is used. This continuum-based modelling approach is unable to assess the cracking of the pipeline. In this study, a fracture mechanics approach is used for the assessments of burst pressures of pipelines with corrosion only defects, pipelines with crack-like defects and pipelines with crack-in-corrosion defects. The fracture mechanics approach with the J-integral was found to simulate successfully the burst pressures obtained from rapture tests of pipelines with corrosion only defects and crack-in-corrosion defects. The conventional von Mises stress-based approach and design equations can reasonably be used for predicting the burst pressures of pipelines with corrosion only defects. However, the fracture mechanics approach is required for pipelines with crack-like defects and crack-in-corrosion defects. A parametric study is presented with calculations of the J-integrals for pipelines with crack-in-corrosion defects for various crack depths and crack lengths.
Published Version
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