Evaluation of the Impact of Abnormally Orientated Grains on the Performance of ScAlN-based Laterally Coupled Alternating Thickness (LCAT) Mode Resonators and Lamb Wave Mode Resonators

A three-dimensional spectral element method (SEM) was developed for analysis of Lamb wave propagation in composite laminates containing a delamination. SEM is more efficient in simulating wave propagation in structures than conventional finite element method (FEM) because of its unique diagonal form of the mass matrix. Three types of composite laminates, namely, unidirectional-ply laminates, cross-ply laminates, and angle-ply laminates are modeled using three-dimensional spectral finite elements. Wave propagation characteristics in intact composite laminates are investigated, and the effectiveness of the method is validated by comparison of the simulation results with analytical solutions based on transfer matrix method. Different Lamb wave mode interactions with delamination are evaluated, and it is demonstrated that symmetric Lamb wave mode may be insensitive to delamination at certain interfaces of laminates while the antisymmetric mode is more suited for identification of delamination in composite structures.

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Notice of Removal: Zero TCF resonator based on S0 Lamb wave mode in AlN thin plate films

2017 IEEE International Ultrasonics Symposium (IUS) ◽

10.1109/ultsym.2017.8092649 ◽

2017 ◽

Author(s):

Mohammed Moutaouekkil ◽

Abdelkrim Talbi ◽

Omar Elmazria ◽

El Houssaine El Boudouti ◽

Philippe Pernod ◽

...

Keyword(s):

Thin Plate ◽

Lamb Wave ◽

Wave Mode

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Lamb Wave Mode Sensitivity to Detect Various Material Defects in Multilayered Composite Plates

Review of Progress in Quantitative Nondestructive Evaluation ◽

10.1007/978-1-4613-0383-1_29 ◽

1996 ◽

pp. 231-238

Author(s):

Tribikram Kundu ◽

Prasanna Karpur ◽

Theodore E. Matikas ◽

Perikles D. Nicolaou

Keyword(s):

Lamb Wave ◽

Composite Plates ◽

Wave Mode ◽

Material Defects ◽

Multilayered Composite

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Incremental scattering of the A0 Lamb wave mode from a notch emanating from a through-hole

Ultrasonics ◽

10.1016/j.ultras.2018.08.004 ◽

2019 ◽

Vol 91 ◽

pp. 220-230 ◽

Cited By ~ 8

Author(s):

Hongye Liu ◽

Xin Chen ◽

Jennifer E. Michaels ◽

Thomas E. Michaels ◽

Cunfu He

Keyword(s):

Lamb Wave ◽

Wave Mode ◽

Through Hole

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Investigation of transcranial ultrasound delivery via Lamb wave mode conversion leveraging a transducer pair

The Journal of the Acoustical Society of America ◽

10.1121/10.0007526 ◽

2021 ◽

Vol 150 (4) ◽

pp. A32-A32

Author(s):

Matteo Mazzotti ◽

Eetu Kohtanen ◽

Alper Erturk ◽

Massimo Ruzzene

Keyword(s):

Lamb Wave ◽

Mode Conversion ◽

Wave Mode ◽

Transcranial Ultrasound

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Attenuation and Phase Velocity of Elastic Wave in Textured Polycrystals with Ellipsoidal Grains of Arbitrary Crystal Symmetry

Acoustics ◽

10.3390/acoustics2010005 ◽

2020 ◽

Vol 2 (1) ◽

pp. 51-72

Author(s):

Gaofeng Sha

Keyword(s):

Phase Velocity ◽

Orientation Distribution ◽

Wave Mode ◽

Homogenization Method ◽

Crystal Symmetry ◽

Polycrystalline Materials ◽

Phase Velocity Dispersion ◽

Static Phase ◽

Generalized Spherical Harmonics ◽

The Impact

This study extends the second-order attenuation (SOA) model for elastic waves in texture-free inhomogeneous cubic polycrystalline materials with equiaxed grains to textured polycrystals with ellipsoidal grains of arbitrary crystal symmetry. In term of this work, one can predict both the scattering-induced attenuation and phase velocity from Rayleigh region (wavelength >> scatter size) to geometric region (wavelength << scatter size) for an arbitrary incident wave mode (quasi-longitudinal, quasi-transverse fast or quasi-transverse slow mode) in a textured polycrystal and examine the impact of crystallographic texture on attenuation and phase velocity dispersion in the whole frequency range. The predicted attenuation results of this work also agree well with the literature on a textured stainless steel polycrystal. Furthermore, an analytical expression for quasi-static phase velocity at an arbitrary wave propagation direction in a textured polycrystal is derived from the SOA model, which can provide an alternative homogenization method for textured polycrystals based on scattering theory. Computational results using triclinic titanium polycrystals with Gaussian orientation distribution function (ODF) are also presented to demonstrate the texture effect on attenuation and phase velocity behaviors and evaluate the applicability and limitation of an existing analytical model based on the Born approximation for textured polycrystals. Finally, quasi-static phase velocities predicted by this work for a textured polycrystalline copper with generalized spherical harmonics form ODF are compared to available velocity bounds in the literature including Hashin–Shtrikman bounds, and a reasonable agreement is found between this work and the literature.

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Leaky Lamb Wave Radiation from a Waveguide Plate with Finite Width

Applied Sciences ◽

10.3390/app10228104 ◽

2020 ◽

Vol 10 (22) ◽

pp. 8104

Author(s):

Sang-Jin Park ◽

Hoe-Woong Kim ◽

Young-Sang Joo

Keyword(s):

Lamb Wave ◽

Lamb Waves ◽

Wave Mode ◽

Wave Radiation ◽

Finite Width ◽

Propagation Characteristics ◽

Radiation Characteristics ◽

Radiation Beam ◽

Leaky Lamb Wave ◽

Waveguide Sensor

In this paper, leaky Lamb wave radiation from a waveguide plate with finite width is investigated to gain a basic understanding of the radiation characteristics of the plate-type waveguide sensor. Although the leaky Lamb wave behavior has already been theoretically revealed, most studies have only dealt with two dimensional radiations of a single leaky Lamb wave mode in an infinitely wide plate, and the effect of the width modes (that are additionally formed by the lateral sides of the plate) on leaky Lamb wave radiation has not been fully addressed. This work aimed to explain the propagation behavior and characteristics of the Lamb waves induced by the existence of the width modes and to reveal their effects on leaky Lamb wave radiation for the performance improvement of the waveguide sensor. To investigate the effect of the width modes in a waveguide plate with finite width, propagation characteristics of the Lamb waves were analyzed by the semi-analytical finite element (SAFE) method. Then, the Lamb wave radiation was computationally modeled on the basis of the analyzed propagation characteristics and was also experimentally measured for comparison. From the modeled and measured results of the leaky radiation beam, it was found that the width modes could affect leaky Lamb wave radiation with the mode superposition and radiation characteristics were significantly changed depending on the wave phase of the superposed modes on the radiation surface.

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