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

The shape and orientation of corrosive defects are critical 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 circular transducer array with Lamb wave tomography approach. Here, considering a special shape defect with two-dimensions elliptical contour in the plate, the various ratios for both defect shape and orientation, individually representing different classifications of defects, is identified and investigated using Lamb wave tomography approach. And the validity of this approach has been proved through simulation experiments.