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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Exploring the advantages of a random 1-3 connectivity piezocomposites structure incorporating piezoelectric fibres as the active element

Harvey, G. and Gachagan, A. and Mackersie, J.W. and Banks, R. (2007) Exploring the advantages of a random 1-3 connectivity piezocomposites structure incorporating piezoelectric fibres as the active element. In: IEEE Ultrasonics Symposium 2006, 2006-10-02 - 2006-10-06.

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Abstract

This paper describes the use of piezoelectric ceramic fibres (PZT5A) for the fabrication of 1-3 composite transducers. Importantly, extensive FE analysis, using the PZFlex code, of these devices has been undertaken with complete 3D models utilised to reflect the random nature of the device structure. The manufacturing process is based on the place-and-fill method. A fibre composite block is produced, from which it is then possible to slice a number of layers of piezoelectric material with a thickness corresponding to the desired frequency of operation. These layers have electrodes applied and are then poled. Electrical impedance profiles of each device demonstrate excellent unimodal behaviour at the thickness resonance frequency, and show excellent correspondence with the FE models. Moreover, these devices possess high electromechanical coupling coefficients (kt > 0.65) for a ceramic volume fraction of 50% and a medium-set polymer (CIBA GEIGY CY221-HY956). Laser vibrometry scans of transducer surface motion corroborate the FE predictions of average uniform surface displacement notwithstanding local variations due to the random nature of the microstructure. Experimental pulse-echo assessments, when operating into a water load, demonstrate comparable sensitivity and bandwidth characteristics between a random fibre and conventional 1-3 composite, with similar specification.