Abstract
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.
Highlights
Nondestructive testing (NDT) and structural health monitoring (SHM) are of great importance in modern industries to improve the reliability of structures and components [1,2]
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
Wave amplitude generated by the d24 wafer increased much quickly than that by the in-plane poled d15 wafer. These results indicated that the energy conversion efficiency of the face shear d24 wafer is better than that of the in-plane poled d15 wafer, and much better than that of the thickness-poled d15 wafer
Summary
Nondestructive testing (NDT) and structural health monitoring (SHM) are of great importance in modern industries to improve the reliability of structures and components [1,2]. In the past two decades, Lamb wave-based inspections had been extensively studied and applied due to the easy excitation and reception by thickness-poled piezoelectric (PZT) wafers [6,7,8,9,10,11,12,13,14]. We can see that all the the above above mentioned mentioned three three types of shear shear mode mode piezoelectric piezoelectric wafers can be used usedtotogenerate/receive generate/receive waves in plates and torsional pipes. The definitions of these three excitation and reception of SH waves in waves plates.in Definitions of these three types of types shear of shear mode piezoelectric wafers were presented. The wave generated by different shear shear mode piezoelectric wafers were investigated by using finite element simulations.
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