Abstract
This paper deals with an optimum design problem of a two-layer composite disk which controls the maximum thermal stress. It is assumed that the disk consists of a structural layer and a piezoelectric layer and a number of electrodes are concentrically arranged on the free surface of the piezoelectric layer. When a prescribed heating temperature distribution acts on the free surface of the structural layer, the maximum thermal stress in the structural layer can be minimized by applying appropriate voltages to the electrodes. The electrode dimensions and piezoelectric layer thickness should be then optimally designed in order to demonstrate the function of stress control to the fullest extent possible. A hybrid optimization technique which simultaneously determines the piezoelectric layer thickness, electrode dimensions, and applied voltages is proposed. Finally, numerical results are shown in tabular and graphical forms.
