Inverse determinations of thickness and elastic properties of a bonding layer using laser-generated surface waves
Resource
Ultrasonics 37 (1): 23-30
Journal
Ultrasonics
Journal Volume
37
Journal Issue
1
Pages
23-30
Date Issued
1999
Date
1999
Author(s)
Abstract
A recent study on the dispersion of laser-generated surface waves in an epoxy-bonded copper-aluminum layered specimen showed that the influence of bonding layer thickness on the surface wave dispersion is clear and could be applied to the NDE of bonding properties. In this paper, an inversion algorithm is introduced to determine the thickness and the elastic properties of bonding layer in a bonded layered medium from the measured velocity dispersion of laser-generated surface waves. Laser ultrasonic experiments were performed on an epoxy-bonded copper-aluminum layered specimen with small bonding thickness. The received dispersive elastic wave signals were processed via the spectral analysis method to obtain the experimental dispersion curve. Inverse analyses of one parameter (thickness), two parameters (longitudinal and transverse wave velocities) and three parameters (density, longitudinal and transverse wave velocities) of the epoxy bonding layer were made. Discussions of the convergence and constraints of the inversion process are included. © 1999 Elsevier Science B. V. All rights reserved.
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