Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Focus: Field Controllable Functional Polymers II

CPP 13.11: Vortrag

Montag, 16. März 2015, 18:00–18:15, C 264

Dynamic mechanical response of dielectric elastomer actuators for the control of optical elements — •Gunnar Gidion, Matthias Kollosche, Werner Wirges, and Reimund Gerhard — Applied Condensed-Matter Physics, Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany

Dielectric Elastomer Actuators (DEA) consisting of an elastomer membrane with compliant electrodes are investigated with respect to their voltage-induced dynamic mechanical response. The in-plane deformation of prestretched acrylic and silicone membranes in a rectangular frame is captured with a high-speed camera and analysed with respect to the frequency response of the device. The geometry is examined for different pre-stretches at frequencies of up to 300 Hz. The AC driving voltage is applied in combination with various DC-bias voltages. The results are compared to the shear moduli obtained by means of dynamic mechanical analysis (DMA) of the respective materials. In addition, it has been observed that the sinusoidal electrical excitation is not translated into a purely sinusoidal motion of the actuator membrane. This observation is discussed in terms of viscoelastic creep and harmonic distortion. The results can be used to understand and modify the dynamic electromechanical response of soft actuators for optical applications such as e.g. the control of the grating period in soft diffractive optical elements.