Mechanical properties and stress equation of steel pipe with circular corrosion

Underground pipelines are the lifeline of the city. Steel pipes are widely used in water supply engineering, the wall thickness of the pipe will reduce due to corrosion and other reasons, resulting in a decrease in the bearing capacity. To clarify the mechanical properties of the pipe under the case of circular corrosion, a three-dimensional finite element model is established using ABAQUS, the influence of the mesh size on the convergence of the results is analyzed, and the finite element results were checked and evaluated using the analytical solution. Afterward, the effects of parameters such as corrosion diameter, corrosion depth, pipe diameter, and internal pressure on the maximum stress and displacement are studied. At last, based on 420 sets of data, the prediction equation of the pipe maximum stress is obtained. The results show that the finite element results are in good agreement with the analytical results, and the radial displacement of the corroded area is large. In corrosive areas, there are significant differences in stress at different locations. The radial displacement of the corroded area is significant, and the uncorroded area is almost unaffected. This study can provide a reference for the evaluation of the service performance of corroded steel pipes.