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Model-assisted NDT for sub-mm surface-breaking crack detection in alloys

A model has been developed to quickly and accurately simulate the response of eddy current probe to sub-mm crack in alloy. Electromagnetic (EM) modeling technique employed a fast and yet stable integral equation (IE) method. Enhanced detection can be achieved via an EM circuit co-simulation approach, which significantly boosted the response signals above the background noise threshold. With this, surface breaking cracks is detected by the resonant frequency-shifting of eddy current response. The developed model was validated by comparing simulated results to the experimental response obtained using an eddy current data collection system.