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Mechanical Systems

Mechanical Systems

Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...

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Related Experiment Video

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Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Published on: December 11, 2014

Topological transformability and reprogrammability of multistable mechanical metamaterials.

Haning Xiu¹, Harry Liu², Andrea Poli³

¹Division of Thoracic and Cardiac Surgery, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115.

Proceedings of the National Academy of Sciences of the United States of America

|December 19, 2022

Summary

Researchers developed a novel Maxwell lattice using bistable units to achieve controllable topological phase transitions. This innovation enables switchable mechanical properties and opens doors for reprogrammable metamaterials and computing architectures.

Keywords:

3D printing bistability maxwell lattice stiffness tuning topological transformation

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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.