Finite element simulation analysis of variable plate thickness magnetic flux leakage signal
In order to analyze the influence of different defect depth and test piece thickness on defect magnetic flux leakage signal in magnetic flux leakage detection,based on the basic principle of magnetic flux leakage detection technology,COMSOL finite element simulation analysis method is used to establish a three-dimensional finite ele-ment model of the leakage magnetic field distribution characteristics of cylindrical defects by using the transverse excitation method,and the defect leakage magnetic field is simulated under different influencing factors.The results show that the obtained leakage magnetic field lines are consistent with the theory.The thickness and defect depth of the test piece have different detection performance for different defect radii,and the advantages and disadvantages of the detection performance are distinguished according to the proposed evaluation method.Finally,it is concluded that the constant depth(8 mm)defect of different test plate thicknesses and the 40%defect depth of the test plate thickness are suitable for the magnetizer structural parameters with the thickness of the 12～32 mm test piece.The research results provide a certain reference value for the optimal design of excitation structure.
magnetic flux leakage signaltransverse excitationcylindrical defectsfinite element simulation
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