Numerical investigation of corroded middle‐high strength pipeline subjected to combined internal pressure and axial compressive loading

Abstract Buried oil and gas pipelines may face the threat of geological disasters such as landslides, faults, floods. However, long‐term buried often have corrosion defects, which bring greater challenges to safe operation pipelines. In this study, via finite element analysis method validated by testing results, blasting pressure a middle‐high strength pipeline with defects under an axial compressive load, distribution von Mises stress on surface, local buckling behavior were studied. influencing factors, axially size characteristics material Based 437 sample points, artificial neural network was adopted predict burst defects. By comparing prediction results numerical simulation accuracy verification model conducted. When load increases certain value, will begin decrease rapidly increases. The larger defect, smaller pipeline. depth length defect significant influence pressure. lower steel grade pipeline, Y / T ratio, bursting Both affect failure mode defect's is small small, fails. large enough, prone structural instability. An increase in cause concentration become more significant. does not but it greatly degree A width their becoming severe.