Dynamic performance of dissipative dielectric elastomers under alternating mechanical load
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This paper presents a theoretical study about the effect of dissipation on the dynamic performance of a dielectric elastomer membrane subject to a combination of mechanical load and voltage. The thermodynamic dissipative model is given and the equation of motion is deduced by a free energy method. It is found that when the applied mechanical load and voltage are static, the membrane may reach a state of equilibrium after the viscoelastic relaxation. When the voltage is static but the mechanical load is sinusoidal, the membrane will resonate at multiple frequencies. The study result indicates that the viscoelasticity can reduce the natural frequency and increase the mean stretch of the dielectric elastomer. After the power source is cut off, the effect of current leakage on dynamic performance under alternating mechanical load is that the natural frequency increases and the mean stretch reduces.
KeywordsMechanical Load Current Leakage Dynamic Performance Rheological Model Dimensionless Frequency
This research has been supported by the Doctoral Fund of Ministry of Education of China (Grant No. 20120201110030) and Major Program of National Natural Science Foundation of China (51290294).
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