A low-frequency ultrasonic Lamb-like wave method suitable for characterizing the thickness, density, shear and longitudinal wave velocities of the bonding layer of an ultra-thin adhesive composite was presented. The dispersion property of the low frequency Lamb wave propagating along the ultra-thin adhe?sive composite was derived, forming the basis of the characterization method. Sources of the evaluation er?ror for the parameters and sensitivity of the method for different parameters were analyzed. Using the ultra?sonic coupler and a pair of broadband longitudinal wave transducers with IMHz center frequency, one can successfully estimate the parameters of the ultra-thin bonding layer (having a thickness of I12μm) of alu?minum/ steel composite, employing the leaky guided wave frequency-domain analysis method.
Key words
adhesive composites /
ultrasonic QNDE /
ultrasonic Lamb-like wave /
dispersion property
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Footnotes
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