Ferroelectric ceramic/polymer composites and their applications

M. P. Wenger School of Electronic Engineering and Computer Systems, University of Wales, Bangor, Dean Street, Bangor, Gwynedd, LL57 1UT, U.K

P. Blanas U.S. Army Research Laboratory, Materials Directorate, Arsenal Street, Watertown, MA, 02172‐0001, USA

C. J. Dias Universidade Nova de Lisboa, Faculdade de Ciěncias e Tecnolgia / Secção de Fisica Aplicada, Torre, 2825, Monte de Caparica, Portugal

R. J. Shuford U.S. Army Research Laboratory, Materials Directorate, Arsenal Street, Watertown, MA, 02172‐0001, USA

O. K. Dasgupta School of Electronic Engineering and Computer Systems, University of Wales, Bangor, Dean Street, Bangor, Gwynedd, LL57 1UT, U.K

Abstract

Thin composite films of calcium modified lead titanate (PTCa)/copolymer of vinylidene fluoride-trifluoroethylene P(VDF-TrFE) and PTCa/Epoxy have been produced and their piezoelectric d_33- and electromechanical coupling coefficient k_t, have been measured. These composite sensors have been used to monitor strain induced in a glass/epoxy laminate produced by cyclic loading. PTCa/P(VDF-TrFE) was embedded in a laminate structure to detect acoustic emission (AE) signals generated on the surface of the laminate by a conventional lead-break technique. The results show that the composite sensor is able to detect AE signals over a wide bandwidth:

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Ferroelectric ceramic/polymer composites and their applications

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Ferroelectric ceramic/polymer composites and their applications

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