scholarly journals 132 Nonlinear Dynamic Deflection and Sound Level in Functionally Graded Piezoelectric Actuators under AC Electric Fields

2007 ◽  
Vol 2007.42 (0) ◽  
pp. 63-64
Author(s):  
Jun NAKAGAWA ◽  
Fumio NARITA ◽  
Yasuhide SHINDO
Keyword(s):  
Electric Fields ◽  
Nonlinear Dynamic ◽  
Piezoelectric Actuators ◽  
Sound Level ◽  
Functionally Graded ◽  
Ac Electric Fields ◽  
Functionally Graded Piezoelectric

Bending Behavior of Functionally Graded Piezoelectric Laminated Actuators under Electric Fields

2007 ◽  
Vol 336-338 ◽  
pp. 2619-2623
Author(s):  
Yasuhide Shindo ◽  
Fumio Narita
Keyword(s):  
Domain Wall ◽  
Electric Fields ◽  
Piezoelectric Actuator ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Functionally Graded ◽  
Experimental Results ◽  
Nonlinear Bending ◽  
Bending Behavior ◽  
Functionally Graded Piezoelectric

We present numerical and experimental results on the nonlinear bending behavior due to domain wall motion in functionally graded piezoelectric actuator under alternating current (ac) electric fields. A nonlinear finite element method is employed to analyze the dynamic response of functionally graded piezoelectric actuator. A phenomenological model of domain wall motion is used in computation, and the effects of ac electric field amplitude and frequency, number of layers, and property gradation on the deflection of the cantilever actuators are examined. Experimental results, which verify the model, are presented using a functionally graded bimorph. The numerical results agree very well with the experimental values.

Antiplane Crack Problem in Functionally Graded Piezoelectric Materials

2002 ◽  
Vol 69 (4) ◽  
pp. 481-488 ◽  
Author(s):  
Chunyu Li ◽  
G. J. Weng
Keyword(s):  
Integral Equations ◽  
Piezoelectric Material ◽  
Electric Fields ◽  
Crack Problem ◽  
Functionally Graded ◽  
Fredholm Integral Equations ◽  
Dual Integral Equations ◽  
Functionally Graded Piezoelectric Material ◽  
Functionally Graded Piezoelectric Materials ◽  
Functionally Graded Piezoelectric

In this paper the problem of a finite crack in a strip of functionally graded piezoelectric material (FGPM) is studied. It is assumed that the elastic stiffness, piezoelectric constant, and dielectric permitivity of the FGPM vary continuously along the thickness of the strip, and that the strip is under an antiplane mechanical loading and in-plane electric loading. By using the Fourier transform, the problem is first reduced to two pairs of dual integral equations and then into Fredholm integral equations of the second kind. The near-tip singular stress and electric fields are obtained from the asymptotic expansion of the stresses and electric fields around the crack tip. It is found that the singular stresses and electric displacements at the tip of the crack in the functionally graded piezoelectric material carry the same forms as those in a homogeneous piezoelectric material but that the magnitudes of the intensity factors are dependent upon the gradient of the FGPM properties. The investigation on the influences of the FGPM graded properties shows that an increase in the gradient of the material properties can reduce the magnitude of the stress intensity factor.

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