Results 151 to 160 of about 82,374 (198)

Invariant Piezoelectric Coefficients for Crystals

physica status solidi (b), 1970
AbstractIn writing out tensors which represent physical properties of crystals, it is customary to choose a Cartesian frame of reference which has a specific orientation with respect to the crystallographic axes. A new formulation is proposed in which the physical properties (in particular the piezoelectric property) of crystals can be specified ...
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Sheet geometry enhanced giant piezoelectric coefficients

Applied Physics Letters, 2006
The authors report a giant piezoelectric coefficient, −d31=2000pm∕V in substrate-free polycrystalline (Pb(Mg1∕3Nb2∕3)O3)0.63(PbTiO3)0.37 (PMN-37PT) sheets at E⩾7kV∕cm, larger than the −d31=930pm∕V exhibited by specially cut commercial PMN-PT single crystals and 300–500pm∕V of polycrystalline bulk PMN-37PT.
Wan Y. Shih, Hongyu Luo, Huidong Li, Christian Martorano, Wei-Heng Shih   +4 more
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Piezoelectric Coefficients of PZT Thin Films

Integrated Ferroelectrics, 2002
Longitudinal piezoelectric coefficient (d 33 ) and transverse piezoelectric coefficient (e 31 ) of sol-gel derived lead zirconate titanate (PZT) thin films have been measured. d 33 was measured based on the converse piezoelectric effect using a single beam laser interferometer. Bending of the substrate caused by surface displacement of the PZT film was
R. C. W. Tsang, K. W. Kwok, H. L. W. Chan, C. L. Choy   +3 more
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Direct measurement of piezoelectric shear coefficient

Journal of Applied Physics, 2013
Piezoelectric materials exhibit electromechanical coupling which has led to their widespread application for sensors, actuators, and energy harvesters. These materials possess anisotropic behavior with the shear coefficient, and have the largest electromechanical coupling coefficient.
Mohammad H. Malakooti, Henry A. Sodano
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Laminates with Given Piezoelectric Expansion Coefficients

Mechanics of Advanced Materials and Structures, 2006
This paper concerns laminates made of composite plies with piezoelectric actuators. The subject of the paper is the research of laminates having, in some directions, null expansion coefficients in extension or having the same expansion coefficient in each direction (isotropic behavior). The general equations for the problem are given in the theoretical
P. Vannucci, J. Pouget
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Sensor effectiveness coefficients for piezoelectric materials

Proceedings of 1995 American Control Conference - ACC'95, 2005
Two piezoelectric sensor effectiveness coefficients that provide a quantitative measure of effectiveness for piezoelectric materials which are being used for sensing strain (voltage sensor), or strain-rate (current sensor) are introduced. The use of these coefficients for selecting sensor materials is illustrated through a numerical example.
B.R. Patnaik, G.R. Heppler, W.J. Wilson
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Stress Dependency of the Thermoelastic and Piezoelectric Coefficients

AIAA Journal, 1997
Abstract An analysis based on fundamental mechanics and thermodynamics is presented for a solid in which the elastic and piezoelectric coefficients are temperature dependent. It is proven that as a consequence of the temperature dependency, the thermal expansion and piezoelectric coefficients must be stress dependent.
Charles W. Bert, Victor Birman
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Material nonlinear piezoelectric coefficients for quartz

Journal of Applied Physics, 1983
An electroelastic or polarizing effect can be used to obtain material nonlinear pizoelectric or electroelastic coefficients. It is shown that these material coefficients, obtained from general rotationally invariant nonlinear equations for small field superposed on a bias, differ from those obtained by using the phenomenological expansion of the ...
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Effective piezoelectric coefficients of ferroelectric 0–3 composites

Ferroelectrics, 2001
Abstract We studied theoretically the effective piezoelectric strain coefficients of a 0–3 composite comprising spherical ferroelectric inclusions dispersed in a ferroelectric matrix. Tensile loading and hydrostatic loading conditions were considered.
C. K. Wong, Y. M. Poon, F. G. Shin
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Effective Piezoelectric Coefficients $$d_{ij}^{*}$$: From Microgeometry to Anisotropy

2018
Piezoelectric coefficients dij are most widespread to describe the piezoelectric effect, electromechanical properties and other related parameters. The effective piezoelectric coefficients \(d_{ij}^{*}\) and their links to sensitivity are discussed for piezo-active composites with various connectivity patterns. Examples of the piezoelectric sensitivity
Topolov V. Y., Bowen C. R., Bisegna P.
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