Zero Group Velocity Resonances of Three Layer Plates for Bonding Evaluation Bruno, François Mezil, Sylvain Laurent, Jérôme Royer, Daniel Ducousso, Mathieu Prada, Claire 2018-02-17T22:48:59.000 2020-06-30T06:53:05Z 2020-06-30T06:53:05Z 2016-01-01
dc.description.abstract <p>Lamb waves in plates are strongly dispersive. For some branches of the dispersion curves ω(k), a minimum occurs at a non-zero wavenumber k, corresponding to a Zero Group Velocity (ZGV) Lamb mode. Such ZGV modes also exist in multi-layer plates and depend on the quality of the bonding. Because the group velocities of these modes vanishe, after a local impact, the energy remains trapped under the source resulting in sharp resonances. Laser based ultrasonic techniques offer a unique tool to observe these resonances. When the layer thickness is small compared with the plate thickness and the acoustic wavelength, the coupling layer can be modeled by a normal and a tangential spring to take into account the normal and shear interfacial stresses [1]. For greater layer thicknesses, the three layer model was used [2], taking into account normal and tangential springs at both interfaces. Under certains hypothesis, such spring stiffnesses can be evaluated from ZGV frequencies [3]. Theoretical results are illustrated through measurements conducted on several samples made of couple of millimeter thick metal plates bonded with submillimetric glue layer. Eventually, spring stiffnesses measurements are realized into samples with different controled bond strengths provided by Safran Tech.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 4978
dc.identifier.contextkey 9252335
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath qnde/2016/abstracts/175
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 21:24:24 UTC 2022
dc.subject.disciplines Acoustics, Dynamics, and Controls
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanical Engineering
dc.title Zero Group Velocity Resonances of Three Layer Plates for Bonding Evaluation
dc.type event
dc.type.genre event
dspace.entity.type Publication
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