Guided Wave Bondline Inspection of a Thick Viscoelastic Layer on an Elastic Half-Space

Bond integrity is of interest to researchers in nondestructive evaluation because it is used as an indicator when assessing the health of structures. In this study, a thick viscoelastic layer bonded to an elastic half-space is considered and a guided wave ultrasonic signal is used to assess bond integrity. Analytical and finite element models are developed to describe wave propagation. Experiments are performed on a 1-inch thick steel plate with a 1-inch thick polymer cast onto the surface which contains both good bond and defect regions. Results of models and experiments are discussed. Physically based features, including amplitude ratio, arrival time, and pulse width, are identified which may be used to assess bond integrity.

References
1. Pilarski, A. and J.L. Rose. “Ultrasonic oblique incidence for improved sensitivity in interface weakness determination,” NDT International, 21(4), pp. 241-6, 1987. 2. Van Velsor, J. “Circumferential guided waves in elastic and viscoelastic multilayered annuli,” PhD thesis in Engineering Science and Mechanics, The Pennsylvania State University, 2009. 3. Puthillath, P. and J.L. Rose, “Ultrasonic guided wave inspection of a titanium repair patch bonded to an aluminum aircraft skin,” Int. J. of Adhesion and Adhesives, 30(7), pp. 566-573, 2010. 4. Bostron, J.H., J.L. Rose and C.A. Moose. “Bond integrity of a plate wave guide on a half-space,” QNDE 2011, Burlington, VT. 5. Rayleigh, J.W.S. “On waves propagated along the plane surface of an elastic solid,” Proc. London Math. Soc., 17, pp. 4-11, 1885. 6. Stoneley, R. “Elastic waves at the surface of separation of two solids,” Proc. Roy. Soc., 106, pp. 416-428, 1924. 7. Rose, J.L. Ultrasonic Waves in Solid Media, Cambridge, New York: Cambridge University Press, 1999
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