Elastic twisting metamaterial for perfect longitudinal-torsional wave mode conversion

Yao, Shengjie; Chai, Yijun; Yang, Xiongwei; Li, Yueming

doi:10.1007/s10483-023-2978-7

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…For instance, the conversion of longitudinal polarization into a hybrid wave representing both longitudinal and twisting modes has been proved by the Origami Kresling converter [44]. Generally, the L-T conversion effect is utilized for a wide range of ultrasonic applications, such as welding and drilling systems [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Longitudinal-twist wave converter based on chiral metamaterials

Lemkalli,

Kadic,

El Badri

et al. 2024

New J. Phys.

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Advances in material architectures have enabled endowing materials with exotic attributes not commonly available in the conventional realm of mechanical engineering. Twisting, a mechanism whereby metamaterials are used to transform static axial load into twist motion, is of particular interest to this study. Herein, computations based on the finite element method, corroborated by a theoretical approach derived from applying Lagrange's equations to a monoatomic spring-mass system, are employed to explore the longitudinal-twist (L-T) conversion exhibited by a chiral tetragonal-beam metamaterial. Firstly, we perform an eigenvalue analysis taking into account the polarization states to highlight the contribution of the longitudinal mode in the L-T conversion. We contrast the twisting behavior of the chiral cell with that of other homogeneous medium, octagonal-tube, and non-chiral cells. Moreover, we demonstrate the influence of the cell's chirality on the L-T conversion using both time-domain and frequency-domain studies. The findings indicate that at least a portion of the longitudinally propagating wave is transformed into twist throughout a broad frequency range and even quasi-totally converted at distinct frequencies.

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Section: Introductionmentioning

confidence: 99%

Longitudinal-twist wave converter based on chiral metamaterials

Lemkalli,

Kadic,

El Badri

et al. 2024

New J. Phys.

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“…Wang et al 2) designed a waveguide-based longitudinal-torsional ultrasonic transducer that can be applied to vibration-assisted medical insertion. Because of rich polarization characteristics in elastic waves, efficient conversion could be realized between various types of wave modes, and many efforts have been devoted to symmetric and asymmetric lamb waves, [3][4][5] longitudinal and transverse waves, [6][7][8][9][10][11][12][13] longitudinal and bending waves, 14,15) longitudinal and torsion waves, 16,17) etc. Different types of metamaterials have been proposed, such as meta-edge, 10,11) origami metamaterials, 12,16) anisotropic metamaterial with or without local resonance, [6][7][8][9]11,15) etc.…”

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confidence: 99%

Patch sticking for efficient mode-converting transmission of elastic waves

Chai,

Zhang,

Yang

et al. 2023

Appl. Phys. Express

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The concept of patch sticking, which can be widely seen in daily life, such as medical care and houseware repair, is introduced in this work for wave manipulation. Specifically, we stick an array of patches on an aluminum plate for efficient mode conversion between in-plane longitudinal and transverse waves. The patches have a carefully designed dimension, and are stuck with specific distances and angles. The working mechanism is revealed through eigen-frequency analysis, and experimental validation is carried out. Our work offers a simple and convenient solution for elastic wave manipulation, and could inspire the design of novel meta-devices.

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A viscoelastic metamaterial beam for integrated vibration isolation and energy harvesting

Zhao,

Lu,

Ding

et al. 2024

Appl. Math. Mech.-Engl. Ed.

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Locally resonant metamaterials have low-frequency band gaps and the capability of converging vibratory energy in the band gaps at resonant cells. It has been demonstrated by several researchers that the dissipatioin of vibratory energy within the band gap can be improved by using viscoelastic materials. This paper designs an integrated viscoelastic metamaterial for energy harvesting and vibration isolation. The viscoelastic metamaterial is achieved by a viscoelastic beam periodically arrayed with spatial ball-pendulum nonlinear energy harvesters. The nonlinear resonator with an energy harvesting function is achieved by placing a free-rolling magnetic ball in a spherical cavity with an additional induction coil. The dynamic equations of viscoelastic metamaterials under transverse excitation are established, and the energy harvesting and vibration isolation characteristics within the dispersion relation of viscoelastic metamaterials are analyzed. The results show that the vibrations of the main body of the viscoelastic metamaterial beam are significantly suppressed in the frequency range of the local resonance band gap. At the same time, the elastic waves are limited in the nonlinear resonator with an energy harvesting function, which improves the energy output. Finally, an experimental platform of viscoelastic metamaterial vibration is established for validation purposes.

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Elastic twisting metamaterial for perfect longitudinal-torsional wave mode conversion

Cited by 5 publications

References 29 publications

Longitudinal-twist wave converter based on chiral metamaterials

Longitudinal-twist wave converter based on chiral metamaterials

Patch sticking for efficient mode-converting transmission of elastic waves

A viscoelastic metamaterial beam for integrated vibration isolation and energy harvesting

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