Polarization-independent full mode-converting elastic metasurfaces

Lee, Woorim; Lee, Jeseung; Park, Chung Il; Kim, Yoon Young

doi:10.1016/j.ijmecsci.2024.108975

Cited by 7 publications

(1 citation statement)

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“…Nonetheless, metamaterials frequently suffer from issues related to their bulky size and complex design. Consequently, metasurfaces have been developed to mitigate these drawbacks [16] and have also been employed for the mode conversion of longitudinal wave in plates [17][18][19], which is actually the symmetric Lamb (S 0 ) wave. Despite the metasurface's superior performance in mode conversion from S 0 wave to shear horizontal (SH 0 ) wave, the discrete phase design commonly results in the diffraction of the induced SH 0 wave.…”

Section: Introductionmentioning

confidence: 99%

A metasurface for suppressing mode conversion and achieving directional reflection of shear horizontal wave

Fu,

Zhu,

Miao

2024

J. Phys. D: Appl. Phys.

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The lowest-order shear horizontal (SH0) guided wave in a plate is crucial for nondestructive testing and structural health monitoring due to its nondispersive nature. However, mode conversion at the interface for the SH0 wave complicates the received information and increases the difficulty of signal analysis. In this work, an elastic metasurface is proposed to suppress mode conversion at the interface and to reflect the SH0 wave directionally. The metasurface comprises a series of rectangular elements with a specific phase gradient covering the 2π phase range. The effectiveness of the proposed metasurface is confirmed through finite element simulations and experimental validation. The results indicate that the metasurface can significantly reduce the amplitude of the reflected lowest-order symmetric Lamb (S0) wave when compared to the reflection without the metasurface, while simultaneously allowing the reflected SH0 wave to propagate at the designed angle. Furthermore, the metasurface maintains its functionality for SH0 wave with incident angles varying from 0° to 25°. This study provides a viable approach for suppressing mode conversion and modulating the reflection behavior of SH0 wave, which is expected to find applications in nondestructive testing and structural health monitoring.

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