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Ultrasonic Techniques for Detection of Weak Adhesion

If a nondestructive testing technique for assuring bond strength can be developed, evaluated and approved, then the use of adhesive bonds in critical structures could become widespread. Both postmanufacture and in-service testing techniques are required. While normal disbonds can be detected easily using ultrasonic testing or other methods, weak bonds and zero volume disbonds have proven extremely elusive. Six ultrasonic techniques are presented in this paper: two conventional (double through transmission and pulse/echo) and four advanced (wideband ultrasonic spectroscopy, nonlinear ultrasonics, oblique incidence ultrasound and shear wave resonance). This paper explains these techniques and reviews their application in previous work, and gives results from recent work on specimens with contaminated adhesive. Encouraging results obtained with double through transmission, pulse/echo and ultrasonic spectroscopy are discussed. The other techniques were found to be inconclusive for contaminated bond lines.

Chambers, J.K. and J.R. Tucker, “Bondline Analysis Using Swept- Frequency Ultrasonic Spectroscopy,” Insight, Vol. 41, 1999, pp. 151– 155. Fassbender, S.U., M. Kroning and W. Arnold, “Measurement of Adhesion Strength Using Nonlinear Acoustics,” Nondestructive Characterization of Materials VII, Parts 1 and 2, 1996, pp. 783–790. Hashin, Z., “The Elastic Moduli of Heterogeneous Materials,” Journal of Applied Mechanics, Vol. 29, No. 3, 1962, pp. 143–150. Hirsekorn, S., “Nonlinear Transfer of Ultrasound by Adhesive Joints — A Theoretical Description,” Ultrasonics, Vol. 39, No. 1, 2001, pp. 57–68. Krautkrämer, J. and H. Krautkrämer, Ultrasonic Testing of Materials, London, Springer-Verlag, 1990. Mienczakowski, M.J., A.K. Holmes and R.E. Challis, “Modeling of Ultrasonic Wave Propagation in Composite Airframe Components,” Review of Progress in Quantitative Nondestructive Evaluation, Vol. 27B, D.O. Thompson and D.E. Chimenti, eds., Melville, NY, AIP, 2007, pp. 995– 1001. Moidu, A.K., A.N. Sinclair and J.K. Spelt, “Nondestructive Characterization of Adhesive Joint Durability Using Ultrasonic Reflection Measurements,” Research in Nondestructive Evaluation, Vol. 11, 1999, pp. 59–80. Price, D.C. and B.J. Martin, “Ultrasonic Inspection of Bonded Metal Plates Using Pulse-Echo Spectroscopy,” Non-Destructive Testing – Australia, Vol. 30, No. 5, 1993, pp. 139–142. Rokhlin, S.I., B. Xie and A. Baltazar, “Quantitative Ultrasonic Characterization of Environmental Degradation of Adhesive Bonds,” Journal of Adhesion Science and Technology, Vol. 18, 2004, pp. 327–359. Rothenfusser, M., M. Mayr and J. Baumann, “Acoustic Nonlinearities in Adhesive Joints,” Ultrasonics, Vol. 38, 2000, pp. 322–326. Smith, R.A., B. Zeqiri, L.D. Jones and M. Hodnett, “Nonlinear Propagation in Water and Its Effect on Ultrasonic C-scanning,” Insight, Vol. 40, No. 1, 1998, pp. 12–19. Smith, R.A., V.L. Weise and R.P. Dalton, “Potential Advanced Ultrasonic Methods for Detection of Weak Adhesion,” Proceedings of NDT2003, 42nd Annual Conference of the British Institute of NDT, 2003. Tang, Z., A. Cheng and J.D. Achenbach, “Ultrasonic Evaluation of Adhesive Bond Degradation by Detection of the Onset of Nonlinear Behaviour,” Journal of Adhesion Science and Technology, Vol. 13, 1999, pp. 837–854. Tucker, J., “Ultrasonic Spectroscopy for Corrosion Detection and Multiple Layer Bond Inspection,” Proceedings of the First Joint DoD/FAA/NASA Aging Aircraft Conference, 1998, pp. 1537–1550. Vine, K., P. Cawley and A.J. Kinloch, “Comparison of Normal and Oblique Incidence Ultrasonic Measurements for the Detection of Environmental Degradation of Adhesive Joints,” NDT&E International, Vol. 35, 2002, pp. 241–253. Weise, V.L., G.S. Armstrong and L.D. Jones, “Comparison of Ultrasonic and Dielectric Techniques Used to Detect Moisture Ingress in Adhesive Joints,” Proceedings of NDT 2001, 40th Annual Conference of the British Institute of NDT, 2001a, pp. 83–88. Weise, V.L., J.R. Tucker, D.A. Bruce and R.A. Smith, “An Initial Investigation into the Relationship between the Material Properties of Adhesive Joints and Their Ultrasonic Properties,” Review of Progress in Quantitative Nondestructive Evaluation, Vol. 20B, D.O. Thompson and D.E. Chimenti, eds., Melville, New York, AIP, 2001b, pp. 1096–1102. Yan, D., B. Drinkwater and S. Neild, “Detectability of Kissing Bonds Using the Non-linear High Frequency Transmission Technique,” 17th World Conference on Nondestructive Testing, Shanghai, China, 25–28 October 2008. Yan D., B. Drinkwater and S. Neild, “Measurement of the Ultrasonic Nonlinearity of Kissing Bonds in Adhesive Joints” NDT&E International, Vol. 42, 2009, pp. 459–466.
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