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Numerical and experimental characterizations of longitudinally polarized piezoelectric d15 shear macro-fiber composites

Numerische und experimentelle Charakterisierung von längs-polarisierten d15 Schub Macro-Fiber Compositen
 
: Kranz, Burkhard; Benjeddou, Ayech; Drossel, Welf-Guntram

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Acta Mechanica 224 (2013), No.11, pp.2471-2487
ISSN: 0001-5970
ISSN: 1619-6937
English
Journal Article
Fraunhofer IWU ()
experimental shear actuation; enthalpy-based homogenization; shear macro-fiber composites; piezoelectric modules; piezoelectricity

Abstract
This contribution presents original numerical and experimental characterizations for prototyped longitudinally polarized piezoelectric d15 shear macro-fiber composites (MFC). The numerical characterization consists of a finite element (FE) simulation based on a representative volume element. It implements an enthalpy-based homogenization method (EBHM), recently proposed by the authors, as an extension of the so-called strain energy method to orthotropic piezoelectric fiber-reinforced composites. The numerical validation is carried out on a previously assumed layout of shear MFC. Later on, the EBHM is used to get the effective electromechanical material parameters of the shear MFC actual layout. These parameters are further validated experimentally through their use in the FE simulation of an original actuation benchmark that is proposed for the manufactured shear MFC experimental characterization. The latter is based on low-frequency (quasi-static) displacement measurements where the shear MFC serves as a voltage-driven actuator. Due to the small overall dislocation, a laser vibrometer is used for the measurements. The comparison of experimental and numerical results shows a reasonably good agreement and a nonlinear actuation response is observed. This work’s major outcomes are the experimental validation of the EBHM and the actuation functional operability of the manufactured longitudinally polarized piezoelectric d15 shear MFC. This opens the possibility for their application as actuator and sensor of shear-induced bending and torsion for vibration, shape and health control, or as a transducer for energy harvesting.

: http://publica.fraunhofer.de/documents/N-264988.html