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http://hdl.handle.net/10397/106415
Title: | A tunable bidirectional SH wave transducer based on antiparallel thickness-shear (d₁₅) piezoelectric strips | Authors: | Chen, M Huan, Q Su, Z Li, F |
Issue Date: | Sep-2019 | Source: | Ultrasonics, Sept 2019, v. 98, p. 35-50 | Abstract: | Guided wave based defects inspection is very promising in the field of structural health monitoring (SHM) and nondestructive testing (NDT) due to its less dissipation and thus long distance coverage. In comparison with the widely used Lamb waves, shear horizontal (SH) waves are relatively simple but less investigated probably due to the traditional notion that SH waves were usually excited by electromagnetic acoustic transducers (EMAT). In this work, we proposed a tunable method to excite single-mode bidirectional SH waves in plates using antiparallel thickness-shear (d15) piezoelectric strips (APS). The proposed SH wave driving mechanism here is similar to that by using the periodic permanent magnetics (PPM) based EMAT with the period of strips equal to half of the wavelength. Both finite element simulations and experiments were conducted to validate this transducer in excitation of bidirectional SH waves. Results show that the Lamb waves excited by single piezoelectric strip can be suppressed very well. The radiation angle of the excited bidirectional SH wave can be reduced by extending the strip length, increasing the driving frequency or using more strips. Moreover, the APS transducer can selectively excite SH1 wave and suppress the SH0 wave at 174 kHz and 273 kHz in a 10 mm-thick aluminum plate. Considering its simple structure, flexible design and low excitation energy, the APS SH wave transducer is expected to be widely used in near future. | Keywords: | Electromagnetic acoustic transducer (EMAT) Guided wave Piezoelectric transducer Shear horizontal wave Thickness-shear |
Publisher: | Elsevier BV | Journal: | Ultrasonics | EISSN: | 0041-624X | DOI: | 10.1016/j.ultras.2019.06.001 | Rights: | © 2019 Elsevier B.V. All rights reserved. © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Chen, M., Huan, Q., Su, Z., & Li, F. (2019). A tunable bidirectional SH wave transducer based on antiparallel thickness-shear (d15) piezoelectric strips. Ultrasonics, 98, 35-50 is available at https://doi.org/10.1016/j.ultras.2019.06.001. |
Appears in Collections: | Journal/Magazine Article |
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Su_Tunable_Bidirectional_Sh.pdf | Pre-Published version | 3.47 MB | Adobe PDF | View/Open |
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