Vertically Reinforced 1-3 Piezoelectric Composites for Active Damping of Functionally Graded Plates

摘要

The performance of vertically reinforced 1-3 piezoelectric composite distributed actuator in the ACLD system bonded to a functionally graded FG plate has been investigated. Deformations of each layer in the system are modeled by the first-order shear deformable theory and the resulting 2-dimensional problem is analyzed by the finite element method. The present work considers transverse normal strains induced in each layer thereby using both vertical and in-plane actuations caused by the constraining layer. The frequency response of the FG plate of the system indicates that the active constraining layer of the ACLD treatment significantly enhances damping characteristics of the plate over that caused by passive damping. It is also found that transverse deformations of the constraining and hence of the constrained layer induce significantly larger damping of the FG plate than that caused by their in-plane deformations. Furthermore, the patches' performance is maximum when they are bonded to the softest (metal rich) surface of the host FG plate.