Identifying the ultrasonic inspecting fields that most strongly interact with adhesive bonding defects
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We propose a systematic modelling procedure to identify the harmonic ultrasonic incident fields that most strongly interact with adhesive bonding defects in submerged multilayer plates. In principle, these are also the optimal choices for the interrogating fields in inverse methods for interfacial stiffness estimation. We model the adhesive bonding with the aid of the spring boundary conditions and model the bonding defects by a reduction in the spring constants. As part of the proposed procedure, we use the invariant embedding technique to compute the reflection coefficient at the top of the immersed laminates. The main advantage of this technique is its unconditional numerical stability even for evanescent waves at high frequencies. The developed algorithm is equally well suited to treating isotropic as well as anisotropic layers. We illustrate the application of the proposed procedure simulating the inspection of a three-layer isotropic plate and a 16-ply anisotropic composite laminate used in the aeronautical industry. In the simulations, we identify the frequencies and angles of incidence that will most strongly interact with bonding defects.
KeywordsAdhesive bonding Adhesion defect Kissing bond Interfacial stiffness Interface integrity Laminates
The authors acknowledge the support of the Brazilian research agencies CNPq and CAPES.
- 1.Moysan J, Galy J, Siryabe E, Gauthier C, N’djomo LF, el Kettani MEC, Potel C, Bruneau M, Renier M, Meziane A, Leduc D, el Mahi A, Castaings M, Izbicki JL, Massacret N (2016) Innovating for structural adhesive bonding evaluation and analysis with ultrasounds: a summary. In: 19th world conference on non-destructive testing, Jun 2016, Münich, Germany. https://www.researchgate.net/publication/305352924
- 2.Castaings M, Siryabe E, Renier M, Meziane A (2015) Ultrasonic characterization of cohesive and adhesive properties of adhesive bonds. J Acoust Soc Am 138:1766. https://www.researchgate.net/publication/283660907
- 8.Li B, Hefetz M, Rokhlin SI (1992) Ultrasonic evaluation of environmentally degraded adhesive joints. Rev Prog Quant Nondestruct Eval 11:1221–1228Google Scholar
- 9.Pialucha T, Cawley P (1992) The detection of a weak adhesive/adherend interface in bonded joints by ultrasonic reflection measurements. Rev Prog Quant Nondestruct Eval 11:1261–1266Google Scholar
- 24.Braga AMB (1990) Wave propagation in anisotropic layered composites. Ph.D. thesis, Stanford University, Stanford, California, pp 1–141Google Scholar
- 25.Braga AMB, Herrmann G (1988) Plane waves in anisotropic layered composites. In: Mal AK, Ting TCT (eds) Wave propagation in structural composites, vol 90. ASME-AMD, New York, pp 81–98Google Scholar
- 33.Gauthier C, Ech Cherif El Kettani M, Galy J, Leduc D, Predoi M, Izbicki J-L (2016) Discrimination of different levels of adhesion in a bi layer aluminum/epoxy structure using lamb waves. WCNDT 2016, Münich, 13–17 June 2016Google Scholar
- 34.Auld BA (1990) Acoustic fields and waves in solids, vol I, 2nd edn. Krieger Publishing Company, MalabarGoogle Scholar