Detection Principle of Shape and Orientation of Corrosive Defects Using Lamb Waves

The shape and orientation of corrosive defects are crit-ical in the evaluation of the reliability and durability of plate-like structures. And Lamb wave is considered as an effective tool for inspections of this kind corrosive plates. In this paper, the shape and orientation of plane defects are detected and presented using a circu-lar transducer array with Lamb wave tomography ap-proach. Here, considering a special shape defect with two-dimensions elliptical contour in the plate, the various ratios for both defect shape and orientation, in-dividually representing different classifications of de-fects, is identified and investigated using Lamb wave tomography approach. And the validity of this approach has been proved through simulation experi-ments.