Volume 127, Number 4, August 2019
|Number of page(s)||4|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||01 October 2019|
Steering and focusing of fundamental shear horizontal guided waves in plates by using multiple-strip metasurfaces
1 LTCS and College of Engineering, Peking University - Beijing 100871, China
2 Center for Applied Physics and Technology, Peking University - Beijing, China
Received: 9 June 2019
Accepted: 27 August 2019
We proposed a metasurface consisting of multiple parallel strips with varied widths which can steer and focus the fundamental shear horizontal (SH0) wave in plates. Firstly, the group velocity of the quasi-SH0 wave in different-width strips was calculated. Then, a multiple-strip metasurface was designed which was realized by through-thickness grooving in an aluminum plate. Finite-element simulations show that this metasurface can steer the SH0 wave to a prescribed angle. Later, experiments were conducted in which thickness-shear (d15) piezoelectric strips were used as SH0 wave exciters and receivers, and experimental results well reproduced the simulation results. Finally, another multiple-strip metasurface was designed to focus the SH0 wave at a designated point. Both simulations and experiments were conducted, and results validated the proposed design. This work may provide guidance for the design of SH wave metasurfaces.
PACS: 62.30.+d – Mechanical and elastic waves; vibrations / 77.65.-j – Piezoelectricity and electromechanical effects
© EPLA, 2019
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