Analysis of Residual Strength of X70 Pipeline Steel with Corrosion Defects

ABAQUS finite element method(FEM) was employed to analyze the residual strength of X70 pipeline with corrosion defects. According to relative failure criteria, the corrosion development law was studied. The results showed that for a pipeline with two corrosion defects, the residual strength increased as the axis distance of two corrosion defects increased. The residual strength increased with the increase of radial angle of two corrosion defects. The results is important to the pipeline′s safe operation and maintenance.