Abstract

Theoretical and experimental studies of ultrasonic wedges which can generate and receive shear horizontal (SH) plate acoustic waves (PAWs) in a metal plate at temperatures up to 200°C are presented. Brass which has a slow shear (S) wave velocity was chosen as the high temperature wedge material. Mode conversion method is used to convert longitudinal (L) waves generated by a high temperature integrated ultrasonic transducer to S waves in the brass wedge. The calculated L to S wave mode energy conversion efficiency is 79.7% with a conversion angle of 64.1°. The S waves in the wedge glued onto a stainless steel (SS) plate with a wedge angle of 42.9° have been converted to SH PAWs in the SS plate. Analytical analysis of the coupling coefficient from the S waves in the wedge to the SH PAWs in the plate is presented. Measurement results demonstrated that SH PAWs using such wedges may be a practical approach for non-destructive testing and structural health monitoring of metal structures.

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