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Technical Briefs

On Electromechanical Coupling in Elastomers

[+] Author and Article Information
K. Y. Volokh

Faculty of Civil and Environmental Engineering,  Technion – Israel Institute of Technology, 32000 Israelcvolokh@technion.ac.il

J. Appl. Mech 79(4), 044507 (May 11, 2012) (5 pages) doi:10.1115/1.4006057 History: Received October 25, 2011; Revised January 23, 2012; Posted February 21, 2012; Published May 11, 2012; Online May 11, 2012

Permittivity of electroactive elastomers alters during deformation. The influence of the permittivity alterations on the electrostriction of elastomers is studied in the present work. Particularly, acrylic elastomer VHB 4910 is considered. A polarization–electric field constitutive theory is introduced accounting for the influence of mechanical deformations. The theory is used to analyze a free electrostriction of a thin elastomer plate. The elastic stress in the plate is described by various constitutive models including neo-Hookean, Yeoh, Arruda-Boyce, and Ogden. Results show that the permittivity alterations during mechanical deformation practically do not affect the process of electrostriction.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 5

Dimensionless charge Q¯=Q/(A0α) versus lateral stretch λ and dimensionless voltage Φ¯=Φɛ0/(L0α) for Arruda-Boyce model: curves β1=-0.1, β1=-0.049, β1=-0.02, β1=0 coincide

Grahic Jump Location
Figure 6

Dimensionless charge Q¯=Q/(A0μ1) versus lateral stretch λ and dimensionless voltage Φ¯=Φɛ0/(L0μ1) for Ogden model: curves β1=-0.1, β1=-0.049, β1=-0.02, β1=0 coincide

Grahic Jump Location
Figure 1

Experiment (stars) versus theory (solid line) for various dielectric parameters

Grahic Jump Location
Figure 2

Electroactive elastomer plate

Grahic Jump Location
Figure 3

Dimensionless charge Q¯=Q/(A0c1) versus lateral stretch λ and dimensionless voltage Φ¯=Φɛ0/(L0c1) for neo-Hookean model: curves for β1=-0.1, β1=-0.049, β1=-0.02, β1=0 coincide

Grahic Jump Location
Figure 4

Dimensionless charge Q¯=Q/(A0c1) versus lateral stretch λ and dimensionless voltage Φ¯=Φɛ0/(L0c1) for Yeoh model: curves for β1=-0.1, β1=-0.049, β1=-0.02, β1=0 coincide

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