Abstract
Thermoelastic problems in piezoelectric materials of class 6mm can be theoretically analyzed by employing a potential function method. The governing equations of the potential functions include coefficients which are solutions to two characteristic equations derived from the stress equation of equilibrium and the equation of electrostatics. For the case of previous studies, piezoelectric materials were selected so that the solutions were given in real numbers. Since there are a few such materials, the extension has been required for a thermoeasltic problem in a piezoelectric material when solutions to two characteristic equations are expressed in comlex numbers. The corresponding piezoelectric materials are PZT cermics. In this paper, a thermoelastic problem in a two layer composite circular disk consisting of a CFRP structural layer onto which a PZT ceramic layer of crystal class 6mm is perfectly bonded. It is then assumed that a number of electrodes are concentrically arranged on the PZT cermic layer. When a heating temperature distribution acts on the structural layer surface, the maximum thermal stress in the structural layer can be suppressed by applying appropriate voltages to the electrodes. The applied voltages are determined by solving a linear programming problem. Obtained numerical results are shown in tabular and graphical forms.
