Simulation and experiment of eddy current detection of U-shaped defects in steel plates

Steel plates are widely used in various industries and are often processed into important equipment components. During production and use, these plates can develop U-shaped defects due to factors such as impact, vibration and bending. These defects can pose safety hazards under the influence of stress and fatigue load. To address this issue, this research paper proposes the design of an orthogonally distributed eddy current probe for detecting U-shaped defects in steel plates. The study uses COMSOL simulation and eddy current testing to obtain relevant data, which is then used to fit the relationship between the length, width, maximum depth and peak voltage of the U-shaped defects. A fitting formula is generated to provide a calculation method for subsequent detection. The results indicate that this type of eddy current inspection probe can effectively detect U-shaped defects with small dimensions.