Dielectric elastomer actuators under equal-biaxial forces, uniaxial forces, and uniaxial constraint of stiff fibers
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CitationLu, Tongqing, Jiangshui Huang, Christa Jordi, Gabor Kovacs, Rui Huang, David R. Clarke, and Zhigang Suo. 2012. Dielectric elastomer actuators under equal-biaxial forces, uniaxial forces, and uniaxial constraint of stiff fibers. Soft Matter 8(22): 6167-6173.
AbstractA membrane of a dielectric elastomer deforms when a voltage is applied through its thickness. The achievable voltage-induced deformation is strongly affected by how mechanical loads are applied. Large voltage-induced deformation has been demonstrated for a membrane under equal-biaxial forces, but only small voltage-induced deformation has been observed for a membrane under a uniaxial force. This difference is interpreted here theoretically. The theory also predicts that, when the deformation of a membrane is constrained in one direction, a voltage applied through the thickness of the membrane can cause it to deform substantially in the other direction. Experiments are performed on membranes under equal-biaxial forces and uniaxial forces, as well as on ﬁber-constrained membranes of two types: a dielectric elastomer membrane with carbon ﬁbers on both faces, and two dielectric elastomer membranes sandwiching nylon ﬁbers. The experimental observations are compared with the theory.
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