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Structural health monitoring (SHM) has become more and more important inmodern industries as it can monitor the safety of structures during the fullservice life and prevent possible losses of life and economics. Shearhorizontal wave in plate-like structures is very useful for long distancedefects inspection since its fundamental mode (SH0) is totally non-dispersive.However, all the currently available SH wave transducers are not suitable forpractical SHM. In this work, we firstly investigated via finite elementsimulations the performances of thickness-poled d15 PZT ring basedomni-directional SH wave piezoelectric transducers (OSH-PT) consisting ofdifferent number of elements. Results show that the two half-rings based OSH-PTcan have perfect omni-directivity and acceptable performances inexcitation/reception of SH0 waves, and its performances can be fairly enhancedby reducing the outer and inner diameters. Experimental results on a 2mm-thick,21mm outer-diameter, 9mm inner-diameter two-half-ring OSH-PT shows that it hasgood omni-directional properties with the maximum deviation of ~14% in bothexcitation and reception of SH0 wave. The signal to noise ratio (SNR) of theOSH-PT in the case of self-excitation and self-reception is over 15dB from145kHz to 200kHz, which is acceptable for most applications. The proposedtwo-half-ring OSH-PT is expected to be widely used in SH0 wave based SHM due toits simple structure, easy fabrication/assembling, low cost and acceptableperformances.

A practical omni-directional SH wave transducer for structural health monitoring based on two thickness-poled piezoelectric half-rings