Manufacture and characterization of high activity piezoelectric fibres

Bowen, Chris R.; Stevens, Ron; Nelson, Luke; Dent, Andrew C E; Dolman, G.; Su, Bo; Button, Tim W.; Cain, Markys G.; Stewart, M

doi:10.1088/0964-1726/15/2/008

Cited by 43 publications

(26 citation statements)

References 22 publications

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“…The maximum strain ( Figure 6) in the positive poling direction of the 1-3 composites is higher than that of the bulk ceramic and relatively high compared to values reported in literature. 15,25 This is attributed to the uniaxial strain state in the fibers, which have relatively high aspect ratio and small lateral dimensions, especially for the continuous 1-3 fiber composites. This effect was also previously reported for small FIG.…”

Section: High Field Properties Of Pzt-pu Compositesmentioning

confidence: 99%

Modeling and characterization of dielectrophoretically structured piezoelectric composites using piezoceramic particle inclusions with high aspect ratios

Ende

Maier

Neer

et al. 2013

Journal of Applied Physics

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In this work, the piezoelectric properties at high electric fields of dielectrophoretically aligned PZT-polymer composites containing high aspect ratio particles (such as short fibers) are presented. Polarization and strain as a function of electric field are evaluated. The properties of the composites are compared to those of PZT-polymer composites with equiaxed particles, continuous PZT fiber-polymer composites, and bulk PZT ceramics. From high-field polarization and strain measurements, the effective field dependent permittivity and piezoelectric charge constant in the poling direction are determined for dielectrophoresis structured PZT-polymer composites, continuous PZT fiber-polymer composites, and bulk PZT ceramics. The changes in dielectric properties of the inclusions and the matrix at high fields influence the dielectric and piezoelectric properties of the composites. It is found that the permittivity and piezoelectric charge constants increase towards a maximum at an applied field of around 2.5-5 kV/mm. The electric field at which the maximum occurs depends on the aspect ratio and degree of alignment of the inclusions. Experimental values of d 33 at low and high applied fields are compared to a model describing the composites as a continuous polymer matrix containing PZT particles of various aspect ratios arranged into chains. Thickness mode coupling factors were determined from measured impedance data using fitted equivalent circuit model simulations. The relatively high piezoelectric strain constants, voltage constants, and thickness coupling factors indicate that such aligned short fiber composites could be useful as flexible large area transducers. V C 2013 American Institute of Physics.

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Section: High Field Properties Of Pzt-pu Compositesmentioning

confidence: 99%

Modeling and characterization of dielectrophoretically structured piezoelectric composites using piezoceramic particle inclusions with high aspect ratios

Ende

Maier

Neer

et al. 2013

Journal of Applied Physics

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“…coefficients, i.e. a high strain per unit electric field [7]. To maximise the strain per unit electric field, the poling direction of the PZT is aligned along the rod length using the interdigitated electrodes.…”

Section: And D 31mentioning

confidence: 99%

Modeling and characterization of piezoelectrically actuated bistable composites

Bowen

Giddings

Salo

et al. 2011

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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This paper develops and validates a finite-element model to predict both the cured shape and snap-through of asymmetric bistable laminates actuated by piezoelectric macro fiber composites attached to the laminate. To fully describe piezoelectric actuation, the three-dimensional compliance [s(ij)], piezoelectric [d(ij)], and relative permittivity [ε(ij)] matrices were formulated for the macro fiber actuator. The deflection of an actuated isotropic aluminum beam was then modeled and compared with experimental measurements to validate the data. The model was then extended to bistable laminates actuated using macro fiber composites. Model results were compared with experimental measurements of laminate profile (shape) and snap-through voltage. The modeling approach is an important intermediate step toward enabling design of shape-changing structures based on bistable laminates.

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“…Bowen et al used an analogue method to calculate the piezoelectric coefficient d 33 of high activity piezoelectric fibres. 12 The investigation of the ferroelectric and electromechanical behavior of single fibres is complicated due to handling, electroding and contacting of the brittle fibres. Yoshikawa et al describe a measurement method for the polarization hysteresis of single fibres.…”

Section: Introductionmentioning

confidence: 99%