Model-Based Parametric Study of Surface-Breaking Defect Characterization Using Half-Skip Total Focusing Method

Abstract As the demand of structural integrity in manufacturing industries is increasing, ultrasonic array technique has drawn more attention thanks to its inspection flexibility and versatility. By taking advantage possibility individual triggering each element, full matrix capture (FMC) data acquisition strategy been developed that contains entire information an scenario. Total focusing method (TFM) as one imaging algorithms, preferably applied FMC dataset since it uses all synthetically focus sound energy at every image pixel region interest. Half-skip TFM (HSTFM) proposed multi-mode involves a backwall reflection wave path, so defect profile could be reconstructed for accurate characterization. In this paper, involving Snell’s law-based mode conversion account reasonable propagation time when happens HSTFM. A series model based simulations (in software simSUNDT) are performed parametric studies, with intention investigating capability characterization using HSTFM varying tilt angle relative position surface-breaking notch probe. The results show certain modes help characterization, but effectiveness limited features. It inappropriate address perspectives rather combination, i.e., TFM, should adopted possible interpretation