Simulation Analysis of Three-Dimensional Finite Element Model about the Corrosion Defect of Pipeline

In order to recognize the depth of the defect on the inner wall of the pipeline, the ANSYS finite element software was used to simulate the eddy current electromagnetic field of the pipeline. A 3D finite element model of a 3mm deep-defective pipe was created for the artificial flaw on the inner wall of the 20# steel pipe. The fitting analysis of the corrosion defects data at different depths of the inner wall was performed by MATLAB. The polynomial relationship curves of the coil impedance and the corrosion defects at different depths were obtained. It was observed that both the amplitude and phase of the impedance exhibited a smooth and decreasing trend with the increasing of the corrosion depth. The simulation results of the comparative thin plate spline fitting show that the polynomial approximation curve is feasible for the quantitative simulation analysis of the relationship between the corrosion depth and the amplitude and phase of the impedance.