Abstract
In order to characterize the quality of adhesive in bonded materials, a metal/bonding/metal assembly model named as “sandwich” model is used to characterize the propagating properties of Lamb wave generated by laser ultrasonic method and studied in theory and experiment. In our experiment, a Nd:YAG ns laser is focused as line source and scanned on the surface of sample to supply signals in time and space, the signals of traveling lamb wave is detected by a beam deflection system. The dispersion curve of Lamb wave is deduced based on 2D FFT of obtained signals. According to the theoretical “sandwich” model, the real part and imaginary part, which is corresponded to the attenuation coefficients of sample, of elastic parameters of sample in wideband frequencies can be determined by theoretical fitting to the dispersion curve, and the determined parameters are reflected the changing properties of the adhesive in bonded materials.
Published Version
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