Abstract
For piezoelectric problem, instead of the conventional finite element procedure, an alternative procedure has been proposed. Its advantage is that the resulting global stiffness matrix becomes positive definite. In the procedure, vector potential ψ deriving electric displacement is introduced with the restriction of no volumetric charge, while voltage φ (scalar potential) is discarded. Using the T-method in computational electro-magnetics, we discuss discretization and electric boundary conditions in three dimensions. The discretization should be done with edge finite elements, and the electric boundary conditions are limited to equipotential voltage on each electrode and no surface charge.
