EXCITATION AND RECEPTION OF PURE SH0 WAVE BASED ON FACE-SHEAR MODE PIEZOELECTRIC CERAMICS WAFERS
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- 英文论文题名：EXCITATION AND RECEPTION OF PURE SH0 WAVE BASED ON FACE-SHEAR MODE PIEZOELECTRIC CERAMICS WAFERS
- 论文作者：Fa-xin LI ; Hong-chen MIAO
- 英文论文作者：Fa-xin LI ; Hong-chen MIAO ; Department of Mechanics and Engineering Science ; College of Engineering ; Peking University
- 年：2016
- 作者机构：Department of Mechanics and Engineering Science, College of Engineering, Peking University;
- 英文论文关键词：Shear horizontal wave ; Face-shear piezoelectric ; Structural health monitoring(SHM) ; Guided wave ; Non-destructive testing
- 会议召开时间：2016-10-21
- 会议录名称：2016年全国压电和声波理论及器件应用研讨会论文摘要集
- 英文会议录名称：Abstract Book of 2016 Symposium on Piezoelectricity, Acoustic Waves and Device Applications
- 语种：英文
- 分类号：TM282
- 学会代码：AGLU
- 会议名称：2016年全国压电和声波理论及器件应用研讨会
- 会议地点：中国陕西西安
- 主办单位：中国力学学会、中国声学学会、IEEE UFFC分会
- 学会名称：中国力学学会
- 页数：2
- 文件大小：92k
- 原文格式：D
- 会议级别：全国
摘要
Background, Motivation and Objective The non-dispersive fundamental shear horizontal(SH0) wave is of practical importance in guided wave based inspection technique due to its attractive features. For instance, the phase and group velocities of SH0 wave are frequency-independent and there is no mode conversion when SH0 wave encounters defects or boundaries, which can reduce the complexity of the received signals. Currently single SH0 mode can only be excited by electromagnetic acoustic transducer(EMAT). However, EMAT requires a strong static bias magnetic field which is usually provided by permanent magnets and so tends to be bulky and heavy, making it not suitable for structural health monitoring(SHM). The requirement of lightweight and low energy consumption SHM system drove researchers to develop SH0 wave transducers based on piezoelectric materials, since piezoelectrics have compact size and peculiar electromechanical coupling properties. However, it is not easy to excite single SH0 mode by conventional piezoelectric transducers because of the absence of face-shear mode in conventional piezoelectric ceramics. Therefore, if one can realize the face-shear mode in piezoelectric ceramics, single SH0 mode is expected to be generated and the application of SH0 mode in SHM would surely be greatly promoted. Statement of Contribution/Methods Firstly, by modifying the symmetry of PZT ceramics via ferroelastic domin engineering, we realized the face-shear(d36) mode in both PZT-4 and PZT-5H. The obtained d36 coefficients can be up to 274 p C/N in PZT-5H ceramics and 108 p C/N in PZT-4 ceramics. Then both experiments and finite element simulations were conducted to check the fabricated d36 PZT's performance on exciting single SH0 mode. In experiments, the d36 PZT was bonded on the the surface of an aluminum plate as actuator, while a d36 type PMN-PT crystal was used as a sensor to check the purity of the excited SH0 wave. After that, a newly defined face-shear d24 PZT wafer was furtherly proposed. The d24 PZT wafer was in-plane poled and its working electric field is along another orthogonal in-plane direction. Analogously, the d24 PZT wafer's performances on excitation and reception of single SH0 mode were investigated by using both experiments and simulations. Results The SH0 mode was successfully excited by the fabricated face-shear d36 PZT wafer, but Lamb waves(S0 and A0 modes) are also generated simultaneously due to the extensional d31 mode always co-existing with the d36 mode. Fortunately, the excited SH0 mode can be dominated over the Lamb waves from 160 k Hz to 280 k Hz. As for the face-shear(d24) PZT wafer, single SH0 wave can be generated in an aluminum plate from 140 k Hz to 190 k Hz. Moreover, experiments show that the face-shear d24 PZT wafer could receive the SH0 wave only and filter the Lamb waves over a wide frequency range(120 k Hz to 230 k Hz). Discussion and Conclusions The proposed face-shear(d36 or d24) mode PZT ceramics wafers are cost-effective, with compact size and excellent energy transfer efficiency. Therefore, the face-shear piezoelectric ceramics proposed in this work may greatly promote the applications of SH0 wave in NDT and SHM. Moreover, as the SH0 wave in plates is analogue to the T(0,1) torsional wave in pipes, this work may also shed some light on the advanced NDT/SHM schemes in pipe-like structures.
Background, Motivation and Objective The non-dispersive fundamental shear horizontal(SH0) wave is of practical importance in guided wave based inspection technique due to its attractive features. For instance, the phase and group velocities of SH0 wave are frequency-independent and there is no mode conversion when SH0 wave encounters defects or boundaries, which can reduce the complexity of the received signals. Currently single SH0 mode can only be excited by electromagnetic acoustic transducer(EMAT). However, EMAT requires a strong static bias magnetic field which is usually provided by permanent magnets and so tends to be bulky and heavy, making it not suitable for structural health monitoring(SHM). The requirement of lightweight and low energy consumption SHM system drove researchers to develop SH0 wave transducers based on piezoelectric materials, since piezoelectrics have compact size and peculiar electromechanical coupling properties. However, it is not easy to excite single SH0 mode by conventional piezoelectric transducers because of the absence of face-shear mode in conventional piezoelectric ceramics. Therefore, if one can realize the face-shear mode in piezoelectric ceramics, single SH0 mode is expected to be generated and the application of SH0 mode in SHM would surely be greatly promoted. Statement of Contribution/Methods Firstly, by modifying the symmetry of PZT ceramics via ferroelastic domin engineering, we realized the face-shear(d36) mode in both PZT-4 and PZT-5H. The obtained d36 coefficients can be up to 274 p C/N in PZT-5H ceramics and 108 p C/N in PZT-4 ceramics. Then both experiments and finite element simulations were conducted to check the fabricated d36 PZT's performance on exciting single SH0 mode. In experiments, the d36 PZT was bonded on the the surface of an aluminum plate as actuator, while a d36 type PMN-PT crystal was used as a sensor to check the purity of the excited SH0 wave. After that, a newly defined face-shear d24 PZT wafer was furtherly proposed. The d24 PZT wafer was in-plane poled and its working electric field is along another orthogonal in-plane direction. Analogously, the d24 PZT wafer's performances on excitation and reception of single SH0 mode were investigated by using both experiments and simulations. Results The SH0 mode was successfully excited by the fabricated face-shear d36 PZT wafer, but Lamb waves(S0 and A0 modes) are also generated simultaneously due to the extensional d31 mode always co-existing with the d36 mode. Fortunately, the excited SH0 mode can be dominated over the Lamb waves from 160 k Hz to 280 k Hz. As for the face-shear(d24) PZT wafer, single SH0 wave can be generated in an aluminum plate from 140 k Hz to 190 k Hz. Moreover, experiments show that the face-shear d24 PZT wafer could receive the SH0 wave only and filter the Lamb waves over a wide frequency range(120 k Hz to 230 k Hz). Discussion and Conclusions The proposed face-shear(d36 or d24) mode PZT ceramics wafers are cost-effective, with compact size and excellent energy transfer efficiency. Therefore, the face-shear piezoelectric ceramics proposed in this work may greatly promote the applications of SH0 wave in NDT and SHM. Moreover, as the SH0 wave in plates is analogue to the T(0,1) torsional wave in pipes, this work may also shed some light on the advanced NDT/SHM schemes in pipe-like structures.
Background, Motivation and Objective The non-dispersive fundamental shear horizontal(SH0) wave is of practical importance in guided wave based inspection technique due to its attractive features. For instance, the phase and group velocities of SH0 wave are frequency-independent and there is no mode conversion when SH0 wave encounters defects or boundaries, which can reduce the complexity of the received signals. Currently single SH0 mode can only be excited by electromagnetic acoustic transducer(EMAT). However, EMAT requires a strong static bias magnetic field which is usually provided by permanent magnets and so tends to be bulky and heavy, making it not suitable for structural health monitoring(SHM). The requirement of lightweight and low energy consumption SHM system drove researchers to develop SH0 wave transducers based on piezoelectric materials, since piezoelectrics have compact size and peculiar electromechanical coupling properties. However, it is not easy to excite single SH0 mode by conventional piezoelectric transducers because of the absence of face-shear mode in conventional piezoelectric ceramics. Therefore, if one can realize the face-shear mode in piezoelectric ceramics, single SH0 mode is expected to be generated and the application of SH0 mode in SHM would surely be greatly promoted. Statement of Contribution/Methods Firstly, by modifying the symmetry of PZT ceramics via ferroelastic domin engineering, we realized the face-shear(d36) mode in both PZT-4 and PZT-5H. The obtained d36 coefficients can be up to 274 p C/N in PZT-5H ceramics and 108 p C/N in PZT-4 ceramics. Then both experiments and finite element simulations were conducted to check the fabricated d36 PZT's performance on exciting single SH0 mode. In experiments, the d36 PZT was bonded on the the surface of an aluminum plate as actuator, while a d36 type PMN-PT crystal was used as a sensor to check the purity of the excited SH0 wave. After that, a newly defined face-shear d24 PZT wafer was furtherly proposed. The d24 PZT wafer was in-plane poled and its working electric field is along another orthogonal in-plane direction. Analogously, the d24 PZT wafer's performances on excitation and reception of single SH0 mode were investigated by using both experiments and simulations. Results The SH0 mode was successfully excited by the fabricated face-shear d36 PZT wafer, but Lamb waves(S0 and A0 modes) are also generated simultaneously due to the extensional d31 mode always co-existing with the d36 mode. Fortunately, the excited SH0 mode can be dominated over the Lamb waves from 160 k Hz to 280 k Hz. As for the face-shear(d24) PZT wafer, single SH0 wave can be generated in an aluminum plate from 140 k Hz to 190 k Hz. Moreover, experiments show that the face-shear d24 PZT wafer could receive the SH0 wave only and filter the Lamb waves over a wide frequency range(120 k Hz to 230 k Hz). Discussion and Conclusions The proposed face-shear(d36 or d24) mode PZT ceramics wafers are cost-effective, with compact size and excellent energy transfer efficiency. Therefore, the face-shear piezoelectric ceramics proposed in this work may greatly promote the applications of SH0 wave in NDT and SHM. Moreover, as the SH0 wave in plates is analogue to the T(0,1) torsional wave in pipes, this work may also shed some light on the advanced NDT/SHM schemes in pipe-like structures.
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