Volume 112, Number 4, November 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 December 2015|
Dynamic electromechanical instability of a dielectric elastomer balloon
1 Department of Mechanical Engineering, National University of Singapore - Singapore 117575
2 Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology Clear Water Bay, Hong Kong
3 Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology Clear Water Bay, Hong Kong
Received: 20 July 2015
Accepted: 17 November 2015
Electromechanical instability, a significant phenomenon in dielectric elastomers, has been well studied in the literature. However, most previous work was based on the assumption that dielectric elastomers undergo quasi-static deformation. This letter investigates the dynamic electromechanical instability of a dielectric elastomer balloon which renders four types of oscillation subject to a parametric combination of DC and AC voltages. The simulated oscillations show that dynamic electromechanical instability occurs within quite a large range of excitation frequency, in the form of snap-through or snap-back, when the DC and AC voltages reach critical values. The balloon is at its most susceptible to dynamic electromechanical instability when the superharmonic, harmonic or subharmonic resonance is excited. Taking all excitation parameters into account, this letter analyzes the global critical condition which triggers the dynamic electromechanical instability of the balloon.
PACS: 77.55.-g – Dielectric thin films / 77.65.-j – Piezoelectricity and electromechanical effects / 05.45.-a – Nonlinear dynamics and chaos
© EPLA, 2015
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