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11 July 2002 Electrostrictive response of an ideal polar rubber: comparison with experiment
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This presentation considers the electrostrictive response of an ideal polar rubber in which each random link carries a dipole constrained to remain perpendicular to the link but free to rotate about it In such materials, there is a possibility of a genuine interplay between mechanical deformation and the electrical permittivity since an applied strain can align the dipole rotation axes. This is a plausible mechanism of genuine electrostriction in polar rubbers but our quantitative analysis has shown that the effect should make only a small contribution to the observed deformation of actuators constructed from polar rubber films with compliant electrodes. This prediction has been confirmed by quantitative measurement of the thickness strain in polar films subjected to high electric fields, the deformation being measured by laser-Doppler vibrometry. Measurements made on Viton B, in particular, show the material to be viscoelastic with a significant phase lag between the applied electric field and the observed strain. This phase lag is shown to be due primarily to the mechanical phase lag at twice the frequency of the applied electric field.
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Geoff R. Davies, Teerapon Yamwong, and Alison M. Voice "Electrostrictive response of an ideal polar rubber: comparison with experiment", Proc. SPIE 4695, Smart Structures and Materials 2002: Electroactive Polymer Actuators and Devices (EAPAD), (11 July 2002);

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