期刊
ULTRASONICS
卷 74, 期 -, 页码 167-173出版社
ELSEVIER
DOI: 10.1016/j.ultras.2016.10.011
关键词
Shear horizontal waves; Guided waves; Face-shear piezoelectrics; Non-destructive testing (NDT); Structural health monitoring (SHM)
资金
- National Natural Science Foundation of China [11422216, 11672003, 11521202]
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 SH0 transducer 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 SH0 transducers have been proposed so far. In this work, an omnidirectional SH0 wave piezoelectric transducer (OSH-PT) was proposed, which consists of a ring array of twelve face shear (d(24)) 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 SH0 waves 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 SH0 wave transmitter or a SH0 wave receiver. This work may greatly promote the applications of SH0 waves in NDT and SHM. (C) 2016 Elsevier B.V. All rights reserved.
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