A Comparative Study of Three Types Shear Mode Piezoelectric Wafers in Shear Horizontal Wave Generation and Reception.
A Comparative Study of Three Types Shear Mode Piezoelectric Wafers in Shear Horizontal Wave Generation and Reception.
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三种剪切模式压电晶片剪切水平波产生和接收的比较研究
DOI：
10.3390/s18082681
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发表时间：
2018-08-15
期刊：
影响因子：
--
通讯作者：
Li F
中科院分区：
文献类型：
--
作者：
Huan Q;Chen M;Li F
基于导波的检测已成为现代工业中评估关键部件可靠性的一种有前途的工具。剪切水平基波（SH 0）由于其非频散特性，一直是板状结构中的重要研究对象。然而，使用压电晶片产生和接收SH 0波并不简单。在本文中，我们首先定义了三种类型的剪切模式压电晶片，即，传统的面内极化厚度剪切（d15）模式、厚度极化厚度剪切（d15）模式和面剪切（d24）模式。然后，进行有限元模拟，以证明其在SH波产生和接收的性能。结果表明，面剪切d24晶片几乎可以产生单模SH 0波，而面剪切d15晶片可以同时产生Lamb波和SH 0波。最后，进行了实验，以检查不同的剪切模式的压电晶片在SH 0波的产生和接收的效率。结果表明，d24晶片可以产生和接收高信噪比的SH 0波，能量转换效率高;而面内极化d15晶片可以产生高振幅的SH 0波，信噪比可以接受，但能量转换效率相对较低。厚度极化d15晶片在SH波产生和接收方面的性能都不如另外两种晶片。本文的工作将有助于SH波在板状结构中的应用。
Guided wave-based inspection has emerged as a promising tool to evaluate the reliability of key components in modern industries. The fundamental shear horizontal (SH0) wave is always of great interests for plate-like structures because of its non-dispersion characteristics. However, the generation and reception of SH0 wave using piezoelectric wafers is not straightforward. In this paper, we firstly define three types shear mode piezoelectric wafers, i.e., the conventional in-plane poled thickness-shear (d15) mode, the thickness-poled thickness-shear (d15) mode, and the face-shear (d24) mode. Then, finite element simulations were conducted to demonstrate their performance in SH wave generation and reception. The results indicated that the face shear d24 wafer can generate almost single mode SH0 wave, while both types of d15 wafers would generate Lamb waves and SH0 wave simultaneously. Finally, experiments were carried out to check the efficiency of different shear mode piezoelectric wafers in SH0 wave generation and reception. The results indicated that the d24 wafer can generate and receive SH0 wave of high signal to noise ratio (SNR) with high energy conversion efficiency, while the in-plane poled d15 wafer would generate SH0 wave of high amplitude and acceptable SNR but with relatively low energy conversion efficiency. The performances of thickness-poled d15 wafer was not as good as the other two in both SH wave generation and reception. This work will be helpful for the applications of SH waves in plate-like structures.
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