A new omnidirectional shear horizontal wave transducer using face-shear (d24) piezoelectric ring array.
The non-dispersive fundamental shear horizontal (SH0) wave in plate-like structures is of practical importance in non-destructive testing (NDT) and structural health monitoring (SHM). Theoretically, an omnidirectional SH0transducer phased array system can be used to inspect defects in a large plate in the similar manner to the phased array transducers used in medical B-scan ultrasonics. However, very few omnidirectional SH0transducers have been proposed so far. In this work, an omnidirectional SH0wave piezoelectric transducer (OSH-PT) was proposed, which consists of a ring array of twelve face-shear (d24) trapezoidal PZT elements. Each PZT element can produce face-shear deformation under applied voltage, resulting in circumferential shear deformation in the OSH-PT and omnidirectional SH0waves in the hosting plate. Both finite element simulations and experiments were conducted to examine the performance of the proposed OSH-PT. Experimental testing shows that the OSH-PT exhibits good omnidirectional properties, no matter it is used as a SH0wave transmitter or a SH0wave receiver. This work may greatly promote the applications of SH0waves in NDT and SHM.
LTCS and Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China; Center for Applied Physics and Technology, Peking University, Beijing 100871, China.
Hongchen
H
Miao
LTCS and Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China.
Qiang
Q
Huan
LTCS and Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China.
Qiangzhong
Q
Wang
LTCS and Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China; Center for Applied Physics and Technology, Peking University, Beijing 100871, China. Electronic address: lifaxin@pku.edu.cn.
Faxin
F
Li
Face-shear piezoelectrics; Guided waves; Non-destructive testing (NDT); Shear horizontal waves; Structural health monitoring (SHM)