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Dynamic pattern of wrinkles in a dielectric elastomer
Dielectric elastomers undergo phase transitions between thick and thin (wrinkled) states due to their electromechanical behaviour. In our experiments on a clamped circular dielectric elastomer membrane, we have observed that at a constant voltage close to the critical voltage for discontinuous phase transition, wrinkles are initiated at different locations on the membrane and they move across the membrane interchangeable with the co-existing flat states forming a dynamic pattern. At a different prestretch, we have also observed a similar co-existence and a dynamic pattern between wrinkled states of different wavelengths (wrinkle-wrinkle discontinuous transition). Analytical and finite element models have been developed to interpret the flat-wrinkle transitions and the effect of pre-stretch on them. A viscoelastic model considering rate dependant deformation may help to interpret the wrinkle-wrinkle transition.
Godaba, H., Zhang, Z.-Q., Gupta, U., Chiang Foo, C., Zhu, J., 2017. Dynamic pattern of wrinkles in a dielectric elastomer. Soft Matter. doi:10.1039/C7SM00198C