Abstract
A novel technique using Lamb waves has been proposed to detect impact damage of composite laminates nondestructively. Conventional ultrasonic testing requires two-dimensional scanning because the inspected area by one operation is relatively small. In this study, the availability of Lamb wave cross-scanning which consists of two orthogonal line-scanning, is demonstrated for quick detection of a localized defect. Firstly, long range scanning is conducted along the principal direction of the laminates. Then, another long range scanning is conducted along the perpendicular direction to the first one. Finally, the obtained results are multiplied orthogonally to each other to make the grayscale image of a defect. Proposed method is found to be effective to quickly obtain the rough image of impact damage.
