Vibration control and low-velocity impact response of graphite/epoxy are investigated. A finite element formulation is presented for modeling the behavior of laminated composites with integrated piezoelectric sensors and actuators. This model is valid for both continuous and segmented piezoelectric elements that can be surface bonded or embedded in laminated plate. The present model takes into account the mass and the stiffness of the piezoelectric patches. The formulation is based on the first-order shear deformation theory. In vibration control, a constantgain feedback control algorithom and a constant-amplitude feedback control algorithom are compared. In low-velocity impact analysis, the impact force history is approximated to sine wave. Low-velocity impact tests are performed using a drop-weight type impact test machine and sensor outputs are measured. Then, the finite element results are compared with the exprimental results.
