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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 (d 15 ) mode, the thickness-poled thickness-shear (d 15 ) mode, and the face-shear (d 24 ) mode. Then, finite element simulations were conducted to demonstrate their performance in SH wave generation and reception. The results indicated that the face shear d 24 wafer can generate almost single mode SH₀ wave, while both types of d 15 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 d 24 wafer can generate and receive SH₀ wave of high signal to noise ratio (SNR) with high energy conversion efficiency, while the in-plane poled d 15 wafer would generate SH₀ wave of high amplitude and acceptable SNR but with relatively low energy conversion efficiency. The performances of thickness-poled d 15 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.

A Comparative Study of Three Types Shear Mode Piezoelectric Wafers in Shear Horizontal Wave Generation and Reception