Investigation of interfacial stiffnesses of a tri-layer using Zero-Group Velocity Lamb modes

Zero-Group Velocity (ZGV) Lamb waves are studied in a structure composed of two plates bonded by an adhesive layer. The dispersion curves are calculated for a Duralumin/epoxy/Duralumin sample, where the adhesion is modeled by a normal and a tangential spring at both interfaces. Several ZGV modes are...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2015-11, Vol.138 (5), p.3202-3209
Main Authors: Mezil, Sylvain, Bruno, Francois, Raetz, Samuel, Laurent, Jérôme, Royer, Daniel, Prada, Claire
Format: Article
Language:English
Subjects:
Acoustics
Mechanics
Physics
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Summary:Zero-Group Velocity (ZGV) Lamb waves are studied in a structure composed of two plates bonded by an adhesive layer. The dispersion curves are calculated for a Duralumin/epoxy/Duralumin sample, where the adhesion is modeled by a normal and a tangential spring at both interfaces. Several ZGV modes are identified and their frequency dependence on interfacial stiffnesses and on the bonding layer thickness is numerically studied. Then, experiments achieved with laser ultrasonic techniques are presented. Local resonances are measured using a superimposed source and probe. Knowing the thicknesses and elastic constants of the Duralumin and epoxy layers, the comparison between theoretical and experimental ZGV resonances leads to an evaluation of the interfacial stiffnesses. A good agreement with theoretical dispersion curves confirms the identification of the resonances and the parameter estimations. This non-contact technique is promising for the local evaluation of bonded structures.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4934958