Vibration of a functionally graded piezoelectric spherical shell filled with fluid

Summary form only given. Nowadays piezoelectric composites are widely used as integrated structural elements including plates and shells. When the concept of functionally graded material is introduced, piezoelectric structures exhibit more advantages. The present paper focuses on the free vibration characteristic of a fluid-filled spherical shell, which consists of functionally graded piezoceramic. The radial inhomogeneity is approached by an approximate laminated model. To obtain a three-dimensional solution more conveniently and efficiently, a mixed method based on state space method is employed. At the end of this paper, some numerical examples are presented, in which the effect of related parameters on the vibration is discussed.