Topological transformability and reprogrammability of multistable mechanical metamaterials

Area of Science:

• Materials Science
• Condensed Matter Physics
• Mechanical Engineering

Background:

• Topological mechanical metamaterials leverage quantum concepts for robust properties like edge states.
• Maxwell lattices are a key class of topological metamaterials with distinct edge behaviors.
• Controlling topological phase transitions is crucial for programmable mechanical responses but faces experimental challenges.

Purpose of the Study:

• To create a Maxwell lattice capable of synchronized topological phase transitions.
• To demonstrate switchable mechanical properties and explore applications in computing and neuromorphic systems.
• To investigate the potential of multimaterial 3D printing for fabricating transformable topological metamaterials.

Main Methods:

• Development of a Maxwell lattice incorporating bistable units.
• Theoretical and experimental validation of synchronized topological phase transitions.
• Multimaterial 3D printing for fabrication and miniaturization.

Main Results:

• Demonstrated dramatically different stiffnesses during topological phase transitions.
• Achieved swift and reversible changes in topologically protected mechanical properties.
• Fabricated a miniaturized topological Maxwell lattice using additive manufacturing.

Conclusions:

• Combining multistability with topological phase transitions enables programmable mechanical metamaterials.
• The developed metamaterial offers a rich design space for mechanical computing and neuromorphic applications.
• Design principles are applicable to various transformable topological metamaterials for diverse functionalities.