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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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This study introduces reprogrammable mechanical metamaterials using embedded magnets to tune properties like buckling strain. This innovation allows for rapid adjustments to mechanical behavior and introduces bistability.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Mechanical metamaterials offer tunable properties, but their design space is often limited.
  • Non-mechanical interactions between unit cells can significantly expand metamaterial functionalities.
  • Controlling mechanical behavior through external stimuli is crucial for advanced applications.

Purpose of the Study:

  • To investigate the use of embedded magnets for controlling the mechanical behavior of planar metamaterials.
  • To demonstrate the ability to reprogram mechanical properties through magnet placement.
  • To explore the introduction of bistability in mechanical metamaterials.

Main Methods:

  • Design and fabrication of planar metamaterials with rotating square unit cells using 3D printing.
  • Periodic embedment of elementary cells with attractive and repulsive magnet configurations.
  • Experimental and numerical analysis under equibiaxial compression.

Main Results:

  • Mechanical properties, including buckling strain and post-buckling stiffness, were effectively tuned by magnet placement.
  • The metamaterial's mechanical behavior could be rapidly reprogrammed by inserting magnets.
  • Bistability was successfully introduced into a metamaterial with a single initial equilibrium state.

Conclusions:

  • Embedded magnets provide an efficient mechanism for reprogramming mechanical metamaterial properties.
  • Rational magnet placement allows for fine-tuning of mechanical characteristics and the induction of bistability.
  • This approach significantly enriches the design space of mechanical metamaterials for diverse applications.