Shear horizontal piezoelectric fiber patch transducers (SH-PFP) for guided elastic wave applications

A new type of a lightweight piezoelectric transducer is proposed for selective excitation of horizontal polarized shear (SH) waves. Based on piezoelectric fibers the transducers are flexible, i.e. show structure conformity. The novel approach allows to introduce significant surface tractions by a tr...

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Bibliographic Details
Published in:NDT & E international : independent nondestructive testing and evaluation 2016-09, Vol.82, p.1-12
Main Authors: Köhler, Bernd, Gaul, Tobias, Lieske, Uwe, Schubert, Frank
Format: Article
Language:English
Subjects:
Double layer
Elastic waves
Fibers
Guided waves
Health monitoring
Horizontal
Mathematical models
Piezoelectric
Piezoelectricity
Shear
Transducer
Transducers
Vibrometry
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Summary:A new type of a lightweight piezoelectric transducer is proposed for selective excitation of horizontal polarized shear (SH) waves. Based on piezoelectric fibers the transducers are flexible, i.e. show structure conformity. The novel approach allows to introduce significant surface tractions by a transducer with double layer crossed fiber arrangement without the need of heavy seismic masses. The transducer operating principles are explained and the performance of a first transducer version is demonstrated by laser vibrometric measuring of the waves emitted into a plate. Numerical modeling of the identical arrangement shows nearly perfect agreement with measurements for the main features while differences in some details helps to understand how the first transducer version can be improved. The transducer exhibits, depending on its aspect ratio, a rather high directivity and a strong mode selectivity. •A new type of piezoelectric fiber patch transducer is proposed.•The transducer excites SH0 modes in efficiently without need of a seismic mass.•It is lightweight.•Complementary modeling and experimental investigation confirmed the basic ideas.
ISSN:0963-8695
1879-1174
DOI:10.1016/j.ndteint.2016.04.001