Share Email Print
cover

Proceedings Paper

Piezoceramic omnidirectional transduction of the fundamental shear horizontal guide wave mode
Author(s): Pierre Belanger; Guillaume Boivin
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Ultrasonic guided waves are now routinely used in non-destructive evaluation. In plate-like structures, three fundamental modes can propagate, namely A0, S0 and SH0. Most of the guided wave literature has thus far focused on the use of A0 and/or S0 because these modes are easy to generate in plate-like structures using standard piezoceramic transducers. Yet, at low frequency, A0 and S0 are dispersive. The consequence of dispersion is that signal processing becomes complex for long propagation distances. SH0, on the other hand, has the particularity of being the only non-dispersive guided wave mode. Omnidirectional transduction of SH0 requires a rotational surface stress which cannot be easily generated using standard piezoceramic transducers. This paper presents a transducer concept based on piezoceramic patches assembled to form a discretized circle. The external diameter of the discretized circle was chosen to be half the SH0 wavelength at the desired centre frequency. Finite element simulations using the Comsol Multiphysics environment showed that in a 1.6 mm aluminium plate the modal selectivity of the transducer was more than 25 dB at 100 kHz. A full transducer was built for experimental validation. The experimental modal selectivity was in the region of 20 dB.

Paper Details

Date Published: 8 April 2016
PDF: 6 pages
Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 98040M (8 April 2016); doi: 10.1117/12.2217478
Show Author Affiliations
Pierre Belanger, École de Technologie Supérieure (Canada)
Guillaume Boivin, École de Technologie Supérieure (Canada)


Published in SPIE Proceedings Vol. 9804:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016
Tzuyang Yu; Andrew L. Gyekenyesi; Peter J. Shull; H. Felix Wu, Editor(s)

© SPIE. Terms of Use
Back to Top