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Nonlinear electroelastic deformations. (English) Zbl 1091.74014
Summary: Electro-sensitive elastomers form a class of smart materials whose mechanical properties can be changed rapidly by the application of an electric field. These materials have attracted considerable interest recently because of their potential for providing relatively cheap and light replacements for mechanical devices, such as actuators, and also for the development of artificial muscles. In this paper we are concerned with a theoretical framework for the analysis of boundary value problems that underpin the applications of the associated electromechanical interactions. We confine attention to the static situation and first summarize the governing equations for a solid material capable of large electroelastic deformations. The general constitutive laws for Cauchy stress tensor and electric field vectors for an isotropic electroelastic material are developed in a compact form following recent work by the first author [Acta Mech. 174, No. 3–4, 167–183 (2005; Zbl 1066.74024)]. The equations are then applied, in the case of an incompressible material, to the solution of a number of representative boundary value problems. Specifically, we consider the influence of a radial electric field on the azimuthal shear response of a thick-walled circular cylindrical tube, the extension and inflation characteristics of the same tube under either a radial or an axial electric field (or both fields combined), and the effect of a radial field on the deformation of an internally pressurized spherical shell.

MSC:
74F15 Electromagnetic effects in solid mechanics
74B20 Nonlinear elasticity
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