Abstract
Propagation of Lamb wave in an aluminum plate having a notch type defect is observed. Lamb waves passing through the aluminum plate were analyzed by two-dimensional Fourier transform (2D-FFT) to discriminate the modes and their mode conversions. A0-mode Lamb waves which is transmitted into aluminum plate is discriminated using the 2D-FFT charts. The mode conversion from A0 to S0 and A1-mode waves by the notch type defect is clearly detected in the reflected and the transmitted waves. The suggestive result that the ratio of S0 or A1 to A0 indicates the degree of damage has been described. Possibility of a Lamb wave method for detecting defect such as ablation, wear and wall reduction is also referred.
