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Area of Science:

  • Materials Science and Engineering
  • Mechanical Engineering
  • Metamaterials Science

Background:

  • Auxetic metamaterials possess a negative Poisson's ratio, offering superior properties over conventional materials.
  • Current auxetic materials face limitations in availability and design versatility.
  • Hierarchical structures offer potential for enhanced material properties and tunable characteristics.

Purpose of the Study:

  • To introduce a novel class of hierarchical auxetic metamaterials.
  • To explore the design principles of these new auxetics based on rotating rigid units.
  • To demonstrate the tunability of auxeticity, pore aperture, and pore size in hierarchical systems.

Main Methods:

  • Development of a new hierarchical auxetic design using the rotating rigid units mechanism.
  • Computational simulations were performed on multi-level rotating square structures.
  • Analysis focused on controlling macroscopic properties through micro-level design.

Main Results:

  • The proposed hierarchical auxetics successfully exhibit a negative Poisson's ratio.
  • Simulations confirmed that design parameters allow control over auxeticity and pore characteristics.
  • Hierarchical systems demonstrated greater versatility compared to non-hierarchical counterparts.

Conclusions:

  • A new class of tunable hierarchical auxetic metamaterials has been successfully proposed.
  • The design allows for precise control over material properties and pore architecture.
  • These auxetics show significant promise for advanced industrial and biomedical applications, including stents and skin grafts.