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Area of Science:

  • Physics
  • Materials Science
  • Metamaterials

Background:

  • Nonreciprocity is often achieved using nonlinear materials, enabling unidirectional wave propagation.
  • Existing systems with nonlinear bistable elements have limitations, allowing only one-time signal transmission due to energy transfer dynamics.

Purpose of the Study:

  • To demonstrate independent programming of nonreciprocity and reversibility in a mechanical metamaterial.
  • To design a mechanical diode capable of sustained, reversible signal transmission.
  • To create a nonreciprocal chain for directional wave propagation.

Main Methods:

  • Utilizing a 1D array of bistable mechanical arches.
  • Engineering symmetric and asymmetric energy landscapes within the arches.
  • Modifying energy barriers to control element switching behavior.

Main Results:

  • A reversible mechanical diode was designed using shallow arches with symmetric energy wells and reduced energy barriers, allowing multiple signal transmissions.
  • An alternating chain of symmetric and asymmetric arches was created, supporting distinct transition waves in opposite directions.

Conclusions:

  • Nonreciprocity and reversibility are not mutually exclusive in mechanical metamaterials.
  • The designed system allows for independent programming of these functionalities.
  • This work opens possibilities for advanced signal processing and wave manipulation in mechanical systems.