Poisson's ratio from polarization of acoustic zero-group velocity Lamb mode

Baggens, Oskar; Rydén, Nils

doi:10.1121/1.4923015

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…Therefore, it is urgent to have simple, economical, and accurate methods applicable to detect the internal defects of grouting sleeves in practical engineering. To address these challenges, researchers have explored the use of ultrasonic guided waves, specifically Lamb waves, which offer advantages such as high accuracy, simplicity, low cost, and nondestructiveness [15,16]. Lamb waves have been applied in various practical engineering and experimental scenarios for damage identification and imaging.…”

Section: Introductionmentioning

confidence: 99%

Time Reversal Method for Lamb−Wave−Based Diagnostics of Multiple−Sleeve Grouting Connections

Lin,

Wang,

Chen

et al. 2023

Buildings

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The grouting quality of the grouting sleeve connector is crucial for ensuring the stability of prefabricated building components. In practical engineering, the grouting sleeve is often arranged with multiple sleeves, and there is no feasible nondestructive testing method for testing the complex arrangement of the sleeve grouting joints in the embedded state. Building upon the feasibility of nondestructive detection of single socket grouting connectors, this study discusses the feasibility of defect detection and the severity of defects. Simulation results are used to investigate the choice of the best excitation signal. For different simulated damage cases, it is proven that the selected damage index can be very sensitive, and both the location and the extent of the damage can be detected successfully. The results demonstrate that with the section injury rate ranging from 10% to 40%, the reverse focus peak decreased from 20% to 60% compared to no injury. The effectiveness of the Lamb−wave−based time reversal method in detecting the internal grouting defects of multiple grouting sleeve joints is proven. This paper focuses on the detection study of the Lamb−wave−based time reversal method and proves its ability to perform the detection task effectively and accurately.

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Section: Introductionmentioning

confidence: 99%

Time Reversal Method for Lamb−Wave−Based Diagnostics of Multiple−Sleeve Grouting Connections

Lin,

Wang,

Chen

et al. 2023

Buildings

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“…They are distinguished as symmetric and antisymmetric modes, S n and A n , where n is the mode order. These modes have two particle displacement components, U 1 and U 3 : U 1 is parallel to the wave propagation direction x 1 , and U 3 is normal to the plate surface, hence parallel to x 3 . U 1 (U 3 ) is symmetric while U 3 (U 1 ) is antisymmetric respect to the mid-plane of the plate for the symmetric (antisymmetric) modes.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, a stationary non-propagating mode is obtained that corresponds to a local resonance in the response spectrum of the plate where the Lamb modes travel. ZGV modes have been proposed for a wide range of applications such as the estimation of the Poisson's ratio [3,4], the measurement of the thickness of plates [5,6], the probing of interfacial stiffness between two plates [7][8][9][10], to cite just a few. The most of the available literature refers to ZGV modes along tungsten [4], aluminium [6], glass [9], duralumin [5,10], poly methyl methacrylate [11] and metal plates bonded with submillimetric glue layer [9].…”

Section: Introductionmentioning

confidence: 99%

Zero-group-velocity acoustic waveguides for high-frequency resonators

Caliendo

Hamidullah

2017

J. Phys. D: Appl. Phys.

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The propagation of the Lamb-like modes along a silicon-on-insulator (SOI)/AlN thin supported structure was theoretically studied in order to exploit the intrinsic zero group velocity (ZGV) features to design electroacoustic resonators that don't require metal strip gratings or suspended edges to confine the acoustic energy. The ZGV resonant conditions in the SOI/AlN composite plate, i.e. the frequencies where the mode group velocity vanishes while the phase velocity remains finite, were investigated in the frequency range from few hundreds of MHz up to 1900 MHz. Some ZGV points were found that show up mostly in loworder modes. The thermal behaviour of these points was studied in the -30 to 220 °C temperature range and the temperature coefficients of the ZGV resonant frequencies (TCF) were estimated. The behaviour of the ZGV resonators operating as gas sensors was studied under the hypothesis that the surface of the device is covered with a thin polyisobutylene (PIB) film able to selectively adsorb dichloromethane (CH 2 Cl 2 ), trichloromethane (CHCl 3 ), carbontetrachloride (CCl 4 ), tetrachloroethylene (C 2 Cl 4 ), and trichloroethylene (C 2 HCl 3 ). at atmospheric pressure and room temperature. The sensor sensitivity to gas concentration in air was theoretically estimated for the first four ZGV points of the inhomogeneous plate. The feasibility of high-frequency, low TCF electroacoustic micro-resonator based on SOI and piezoelectric thin film technology was demonstrated theoretically.[5, 10], poly methyl methacrylate [11] and metal plates bonded with submillimetric glue layer [9]. Although the literature concerning ZGV Lamb modes is rather extensive, to the authors' knowledge, only a few studies consider the topic of ZGV electro-acoustic resonators on thin suspended acoustic waveguides: in the references [12 ,13] the first symmetric Lamb S 1 mode ZGV resonator based on a c-AlN thin suspended membrane (2.5 µm thick and wavelengths of about 8.0 -8.8 µm) is theoretically studied and experimentally verified. The impact of the free edges shapes (flat or biconvex) of the piezoelectric suspended rectangular membrane, the tether-to-plate angle (90º or 59° for "butterfly" shaped plate), electrode configurations, materials, and thicknesses on the performances of the AlNbased Lamb wave resonators have been investigated in references [14 -17]. As opposed to the ZGV resonators, the resonators based on a piezoelectric thin suspended membrane with free edges require a more complicated micromachining technology to acoustically isolate the resonator and mechanically couple it to the substrate by two anchors. Indeed, the ZGV points are associated with an intrinsic energy localization: the energy confinement is a natural consequence of the selected acoustic mode thus reducing the technological complexity with respect to that required by the free edges resonators. The characteristics of the ZGV resonators, such as their phase velocity, resonant frequency and Q factor, are affected by the properties of the layer materials, the thi...

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“…Such techniques, which use both propagating and nonpropagating modes with an analysis based on Lamb wave theory, enable a direct quantitative estimation of plate thickness and material velocity in absolute values; this differs from the original IE method that requires either a calibration sample or correction factor to provide the corresponding result [17]. In addition to quantitative estimations, the Lamb wave interpretation also facilitates the improved detectability and accuracy of the S1-ZGV frequency [18,19] and enables an evaluation of Poisson's ratio [20] from the characteristics of the S1-ZGV Lamb mode shape.…”

Section: Introductionmentioning

confidence: 99%

Lamb Wave Phase Velocity Imaging of Concrete Plates with 2D Arrays

Tofeldt

Rydén

2017

J Nondestruct Eval

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In the nondestructive evaluation of concrete structures, ultrasonic techniques are considered to be more capable than lowfrequency techniques such as the impact-echo method. This is especially true with the recent development of ultrasonic transducers, synthetic apertures, and results in an image form, and because low-frequency techniques are usually limited in their evaluation to the frequency of one single resonant mode. With the aim of reducing this gap in capabilities, we present a 2D array and wide-frequency bandwidth technique for Lamb wave phase velocity imaging. The presentation involves a measurement on a newly cast concrete plate using a hammer and an accelerometer as an example. The key concept of the technique is the use of 2D arrays that record a full wave field response over a limited surface subdomain within the complete measurement domain. Through a discrete Fourier transform, a spectral estimate is obtained for the 2D array in the frequencyphase velocity domain. The variation of the phase velocity is then mapped using a stepwise movement of the 2D array within the complete measurement domain. With two different types of 2D arrays, the variation of the phase velocity for the A0 Lamb mode is mapped and displayed in a polar and image plot, and low variation is observed for both cases. This result verifies the expected condition of a homogenous material and plate thickness and, more importantly, highlights the potential of wide-frequency bandwidth techniques based on full wave field data.

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Poisson's ratio from polarization of acoustic zero-group velocity Lamb mode

Cited by 11 publications

References 16 publications

Time Reversal Method for Lamb−Wave−Based Diagnostics of Multiple−Sleeve Grouting Connections

Time Reversal Method for Lamb−Wave−Based Diagnostics of Multiple−Sleeve Grouting Connections

Zero-group-velocity acoustic waveguides for high-frequency resonators

Lamb Wave Phase Velocity Imaging of Concrete Plates with 2D Arrays

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