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

Mézil, Sylvain; Bart, François; Raetz, Samuel; Laurent, J.; Royer, D.; Prada, Claire

doi:10.1121/1.4934958

Cited by 49 publications

(27 citation statements)

References 24 publications

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“…The experimental and theoretical ZGV frequencies are in reasonable agreement. The residual ~2 % mismatch may be caused either by a difference in the Si 3 N 4 layer parameters (see Supplementary Note 2) or to imperfect adhesion between the two layers 12,13 . The two other ZGV Lamb modes, predicted near 3 and 7 GHz, could not be detected.…”

Section: Resultsmentioning

confidence: 99%

Imaging gigahertz zero-group-velocity Lamb waves

et al. 2019

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Zero-group-velocity (ZGV) waves have the peculiarity of being stationary, and thus locally confining energy. Although they are particularly useful in evaluation applications, they have not yet been tracked in two dimensions. Here we image gigahertz zero-group-velocity Lamb waves in the time domain by means of an ultrafast optical technique, revealing their stationary nature and their acoustic energy localization. The acoustic field is imaged to micron resolution on a nanoscale bilayer consisting of a silicon-nitride plate coated with a titanium film. Temporal and spatiotemporal Fourier transforms combined with a technique involving the intensity modulation of the optical pump and probe beams gives access to arbitrary acoustic frequencies, allowing ZGV modes to be isolated. The dispersion curves of the bilayer system are extracted together with the quality factor Q and lifetime of the first ZGV mode. Applications include the testing of bonded nanostructures.

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Section: Resultsmentioning

confidence: 99%

Imaging gigahertz zero-group-velocity Lamb waves

et al. 2019

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“…defect detection, and adhesion testing [20][21][22][23][24]. In the case of Lamb waves in plates, it was also demonstrated that mode conversion between backward-propagating and forwardpropagating waves (or vice versa) at a step change in thickness leads to negative refraction, a process in which the refracted ray leaves the interface at an angle that is on the opposite side of the interface normal to that predicted by the usual Snell's law [25,26].…”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

Broad-angle negative reflection and focusing of elastic waves from a plate edge

et al. 2016

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Guided elastic waves in plates, or Lamb waves, generally undergo reflection and mode conversion upon encountering a free edge. In the case where a backward-propagating Lamb wave is mode-converted to a forwardpropagating wave or vice versa, the mode-converted wave is reflected on the same side of the surface normal as the incident wave. In this paper, we study such negative reflection and show that this effect can be achieved over a broad angular range at a simple plate edge. We demonstrate, through both numerical and experimental approaches, that a plate edge can act as a lens and focus a mode-converted Lamb wave field. Furthermore, we show that as the wave vectors of the incident and mode-converted Lamb waves approach each other, the mode-converted field nearly retraces the incident field. We propose that broad-angle negative reflection may find application in the nondestructive testing of structures supporting guided waves and in the development of new acoustic devices including resonators, lenses, and filters.

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“…Due to the localized resonances, ZGV modes are ideal for localized measurements of material properties because the clamping of the material is not important if excitation and measurement are sufficiently far from the clamping boundaries. ZGV modes have been used for locally measuring the Young's modulus or thickness of single-or multi-layered materials [17], [20], [21]. ZGV modes can be generated by a impulse from a pulsed laser source and detected using a laser interferometer [20].…”

Section: Background Of Acoustic Measurementsmentioning

confidence: 99%

“…2 Therefore, we built up our own experimental setup. The setup we chose to use are commonly used by other researchers [17], [20], [21] to investigate ZGV Lamb waves.…”

Section: Simulation and Analysismentioning

confidence: 99%

Characterization of mechanical properties of thin-film Li-ion battery electrodes from laser excitation and measurements of zero group velocity resonances

Yao

Cassler

Wheeler

et al. 2019

Journal of Applied Physics

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The mechanical properties of thin-film Li-ion battery electrodes are controlled by the micro structure of the constituent materials. In this work, a non-contact and non-destructive measurement of the mechanical properties of electrode films is performed by measurement of zerogroup velocity (ZGV) resonances. The ZGV Lamb wave modes of a solid bilayer consisting of a thin metallic layer and a thin compliant coating layer are shown to be dependent on the Young's moduli, thicknesses, densities and Poisson ratios of the layers. Theoretical models are used to quantify the sensitivity of the ZGV resonances to changes in mechanical properties. Experimental ZGV resonances are excited using a pulsed infrared laser and detected using a laser interferometer. Commercial-grade battery films with different coating materials, densities and thicknesses are measured. Young's moduli of the battery electrode layers are estimated using the combination of a theoretical model and experimental results. The effect of the calendering process on the battery materials is also investigated. Results suggest that the Young's modulus of the electrode coating increases drastically after the battery films are calendered. This technique can be used to quantitatively study the mechanical properties of Li-ion battery electrodes to improve overall battery performance.

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

Cited by 49 publications

References 24 publications

Imaging gigahertz zero-group-velocity Lamb waves

Imaging gigahertz zero-group-velocity Lamb waves

Broad-angle negative reflection and focusing of elastic waves from a plate edge

Characterization of mechanical properties of thin-film Li-ion battery electrodes from laser excitation and measurements of zero group velocity resonances

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