Multiple zero-group velocity resonances in elastic layered structures

Глушков, Е. В.; Glushkova, Natalia

doi:10.1016/j.jsv.2021.116023

Cited by 19 publications

(6 citation statements)

References 31 publications

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“…Moreover, in ( 27 ), the response to the point-source excitation appears to be dominated by the two ZGV frequencies associated to the principal directions of the crystal. This fact was confirmed by numerical computations in ( 25 ). However, the described effects remain unexplained in the literature.…”

Section: Introductionsupporting

confidence: 67%

“…ZGV resonances in anisotropic plates were the object of some theoretical (24)(25)(26) and experimental studies (27,28). Prada et al (27) revealed the directional dependence of the ZGV resonance frequency in a silicon wafer, and we reproduce this result in Fig.…”

Section: Introductionmentioning

confidence: 58%

“…It has been a common practice in the literature to plot the dispersion curves for a given propagation direction as in Fig. 4A to identify ZGV modes; see (25)(26)(27). However, these curves only reveal the axial component c gr = ∂ω/∂k of the group-velocity vector.…”

Section: Zgv and Tgv Wavesmentioning

confidence: 99%

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Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates

Kiefer,

Mezil,

Prada

2023

Sci. Adv.

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Elastic waves in anisotropic media can exhibit a power flux that is not collinear with the wave vector. This has notable consequences for waves guided in a plate. Through laser-ultrasonic experiments, we evidence remarkable phenomena due to slow waves in a single-crystal silicon wafer. Waves exhibiting power flux orthogonal to their wave vector are identified. A pulsed line source that excites these waves reveals a wave packet radiated parallel to the line. Furthermore, there exist precisely eight plane waves with zero power flux. These so-called zero–group-velocity modes are oriented along the crystal’s principal axes. Time acts as a filter in the wave-vector domain that selects these modes. Thus, a point source leads to beating resonance patterns with moving nodal curves on the surface of the infinite plate. We observe this pattern as it emerges naturally after a pulsed excitation.

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Section: Introductionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 58%

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Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates

Kiefer,

Mezil,

Prada

2023

Sci. Adv.

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“…Figure 5 shows the frequency spectrum of the waveform in the defect-free model. It is obvious that there are two zero-group velocity (ZGV) resonance modes of the Lamb wave [40,41]; the ZGV resonance frequencies of S 1 mode and A 3 mode are 3.74 MHz and 6.35 MHz, respectively. Figure 6 shows the influence of the delamination size on the frequency spectrum.…”

Section: Analysis Of Waveform and Frequencymentioning

confidence: 99%

Evaluation of the Bond Quality of Metal-Clad Plates Using Laser Ultrasonic Local Resonance

Ji,

Cao,

Zhang

2024

Coatings

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The effective detection of delamination defects, especially sub-millimeter delamination defects, in metal-clad plates is of great significance in improving product quality. In this work, the laser ultrasonic (LU) local resonance method is used to locate and characterize the sub-millimeter defects in stainless/carbon steel-clad plates. The influence of the delamination radius on the amplitude and resonant frequency of the laser ultrasound was investigated using 2D axisymmetric finite element (FE) simulations. The simulation results show that both the amplitude and the first resonance frequency (FRF) are effective features for detecting large-scale delamination defects, but the FRF is a better feature for detecting tiny delamination defects. A 304/Q235/304-clad plate specimen was made through a hot rolling bonding process, which contained a large number of self-forming delamination defects. The laser ultrasonic signals of different composite states collected in the experiment have good consistency with the simulated waveforms. The experimental results show that the laser ultrasonic local resonance method is a high-resolution imaging method, which can locate and characterize the sub-millimeter delamination defects in stainless/carbon steel-clad plates.

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“…This is attributed to the fact that the mass addition and wave leakage caused by conventional bulky transducers coupled to the inspected structure disturb the generation and acquisition of ZGV waves significantly, as evidenced elsewhere. 27 The noncontact laser ultrasound technique has demonstrated its effectiveness in investigation of ZGV waves. However, devices for the laser pulse generation, beam control, and sensing unit are bulky and wieldy, rendering them inconvenient for the in situ measurement.…”

Section: Introductionmentioning

confidence: 99%

Advancing measurement of zero-group-velocity Lamb waves using PVDF-TrFE transducers: first data and application to in situ health monitoring of multilayer bonded structures

Liu

Guan

et al. 2022

Structural Health Monitoring

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Driven by the rapid advancement in manufacturing technologies, engineering structures with complex geometries are increasingly applied in various industries, posing challenges to the applicability and adaptability of existing structural health monitoring methods based on guided ultrasonic waves. To fulfill the characterization of defects in complex structures, a novel approach featuring a conjunction of zero-group-velocity (ZGV) Lamb waves and polarized poly(vinylidenefluoride-co-trifluoroethylene) (PVDF-TrFE) transducers is proposed. In this approach, the PVDF-TrFE solvent is deposited and in situ polarized on the structure surface to form thin and flexible coatings, with which the ZGV waves can be excited efficiently and measured reliably. On this basis, the defect can be characterized by investigating the defect-induced alteration in ZGV wave features. In experimental validations, disbond defects in multilayer bonded structures are evaluated using the ZGV waves measured with fabricated PVDF-TrFE transducers. For the first time, the ZGV waves are measured in a contact and in situ manner. Compared with conventional noncontact measurement of ZGV waves, the proposed approach features a remarkably improved reliability, convenience for narrowband excitation, immunity to measurement uncertainty and capability of in situ monitoring. The proposed approach can advance the ZGV wave-based methods toward the in situ health monitoring and enable the defect evaluation in emerging complex structures.

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Multiple zero-group velocity resonances in elastic layered structures

Cited by 19 publications

References 31 publications

Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates

Beating resonance patterns and extreme power flux skewing in anisotropic elastic plates

Evaluation of the Bond Quality of Metal-Clad Plates Using Laser Ultrasonic Local Resonance

Advancing measurement of zero-group-velocity Lamb waves using PVDF-TrFE transducers: first data and application to in situ health monitoring of multilayer bonded structures

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