Piezoelectric transducer embedded in a composite plate: Application to Lamb wave generation
Piezoelectric transducer embedded in a composite plate: Application to Lamb wave generation
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DOI：
10.1063/1.366015
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发表时间：
1997-09-01
影响因子：
3.2
通讯作者：
Balageas, D
中科院分区：
文献类型：
--
作者：
Moulin, E;Assaad, J;Balageas, D
本文的目的是证明利用嵌入在复合板中的压电式换能器可以有效地产生兰姆波，用于无损评估和健康监测应用。考虑了埋入复合材料主板中的圆柱形换能器。用有限元方法得到了真空中换能器单独的阻抗和埋入换能器的电阻抗，从而可以识别共振模式。此外，还计算了在共振频率下用于识别Lamb波类型的板中的位移场。将有限元计算结果与主体材料的兰姆波频散曲线进行了比较，两者吻合较好。给出了含有相同压电换能器的复合板试件的实验结果(电阻抗、频率响应和相速度)。数值计算结果与实验结果基本吻合。此外，实验还表明，埋入换能器的径向模式具有很高的耦合系数(约50%)，可以用来产生S-0兰姆波。(C)1997年美国物理研究所。
The aim of this paper is to show that Lamb waves may be effectively generated using piezoelectric transducers embedded inside a composite plate, for nondestructive evaluation and health monitoring applications. A cylindrical transducer embedded in a composite host plate is considered. The electrical impedance of the transducer alone in vacuum and then of the embedded transducer, which allows the identification of the resonance modes, have been obtained by the finite element method (FEM). Moreover, the displacement fields in the plate, which allow the identification of the types of Lamb waves, have been computed at the resonance frequencies. Comparison between the FEM results and the Lamb wave dispersion curves of the host material are in good agreement. Experimental results (electrical impedance, frequency response, and phase velocities) concerning a composite plate specimen containing the same piezoelectric transducer inside it are shown. A good agreement is generally obtained between numerical and experimental results. In addition, it has been shown that the radial mode of the embedded transducer, which has a high coupling coefficient(around 50%), can be used to generate S-0 Lamb waves. (C) 1997 American Institute of Physics.