Abstract
The well-posedness of the initial-boundary value problems for quasi-electrostatic equations in a bounded domain with Lipschitz boundary is proved. The quasi-electrostatic equation is the coupled system of the equations of motion and the equation of the quasistatic electric field. The mass density, the elastic, piezoelectric and dielectric tensors are bounded measurable functions in the domain, and these tensors satisfy the positivity and the symmetry. The initial conditions are given only for the mechanical displacement and its time derivative. The methods of proof are Galerkin's method, duality argument and energy inequality.
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