Evaluation Method of Corroded Pipelines Based on Mises Intensity Criterion

In response to the reduction of the pipeline carrying capacity caused by corrosion, the pipeline defect assessment methods were studied. Based on the distortion energy intensity criterion of Mises, the formulation of pipeline ultimate bearing capacity was derived, theoretical calculation results were compared with the results of ANSYS finite element analysis software. An iso-depth square corrosion pipeline model was established. The influences of corrosion defect depect depth, length and width on the ultimate bearing capacity of pipeline defects was studied for the corrosion defects with different parameters. Simulation results showed that corrosion defect depth was the most important factor;as the corrosion defect length reached a certain value, the ultimate bearing capacity kept unchanged;the corrosion defect width strengthened the ultimate bearing capacity very weakly.