Unsymmetric composite laminates morphing via piezoelectric actuators

A composite panel, with a [0/90] unsymmetric layup, exhibits bi-stable anticlastic equilibrium configurations. One way to provide morphing capabilities to such a panel is attained by attaching piezoelectric actuators to its surface. In such a design an electric field is applied to the piezoelectric actuators in order to trigger snap-through behavior of the panel/actuator assembly. A simple cantilever beam configuration is discussed to perform actuator assessment. Results are compared to with predictions from Extended Classical Lamination Theory and finite element analysis. Guidelines are proposed to design a morphing unsymmetric panel/actuator assembly. The panel/actuator(s) assembly is manufactured accordingly. Snap-through experiments are conducted and the ABAQUS finite element software is used to predict snap-through behavior. Analysis predictions are in good agreement with test results.