Modeling and characterization of piezoelectrically actuated bistable composites

Area of Science:

• Computational mechanics
• Materials science
• Smart structures

Background:

• Bistable laminates offer unique shape-changing capabilities.
• Piezoelectric macro fiber composites provide effective actuation for smart structures.
• Accurate modeling is crucial for designing complex actuated systems.

Purpose of the Study:

• To develop and validate a finite-element model for asymmetric bistable laminates.
• To predict laminate shape and snap-through behavior under piezoelectric actuation.
• To advance the design of shape-changing structures using bistable laminates.

Main Methods:

• Formulated three-dimensional matrices for piezoelectric actuation (compliance, piezoelectric, permittivity).
• Developed a finite-element model for actuated isotropic aluminum beams, validated against experimental data.
• Extended the model to asymmetric bistable laminates actuated by piezoelectric macro fiber composites.

Main Results:

• The finite-element model accurately predicted the cured shape and snap-through voltage of bistable laminates.
• Model validation against experimental measurements confirmed its predictive capabilities.
• Demonstrated the model's effectiveness for analyzing piezoelectric actuation in bistable laminates.

Conclusions:

• The developed finite-element model is a key tool for understanding and predicting the behavior of piezoelectric-actuated bistable laminates.
• This research provides a foundation for the rational design of adaptive and shape-morphing structures.
• The validated modeling approach facilitates the integration of bistable laminates in advanced engineering applications.