Finite Element Analysis of Smart Structures with Piezoelectric Sensors/Actuators Including Debonding

In vibration active control of composite structures, piezoelectric sensors/actuators are usually bonded to the surface of a host structure. Debonding of piezoelectric sensors/actuators can result in significant changes to the static and dynamic response. In the present paper, an novel Enhanced Assumed Strain(EAS) piezoelectric solid element formulation is developed for vibration active control of laminated structures bonded with piezoelectric sensors and actuators. Unlike the conventional brick elements, the present formulation is very reliable, more accurate, and computationally efficient and can be used to model the response of shell structures besides thin plates. Delaminations are modeled by pairs of nodes with the same coordinates but different node numbers, and numerical results demonstrate the performance of the element and the global and local effects of debonding sensors/actuators on the dynamics of the adaptive laminates.