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Handedness in shearing auxetics creates rigid and compliant structures.

Jeffrey Ian Lipton1, Robert MacCurdy2, Zachary Manchester3

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Researchers developed handed auxetic structures that expand and shear, inspired by nature. These novel materials can be compliant or rigid, with applications in robotics, medicine, and engineering.

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Area of Science:

  • Materials Science
  • Mechanics
  • Geometry

Background:

  • Nature utilizes repeating units to create complex, handed structures with tunable mechanical properties.
  • Auxetic materials, characterized by negative Poisson's ratio, expand under tension and are built from repeating unit cells.
  • Achieving handedness in auxetic structures has been a challenge, limiting their design complexity and applications.

Purpose of the Study:

  • To develop a method for introducing handedness into auxetic unit cells that exhibit shear deformation during expansion.
  • To explore the design rules governing the symmetry and alignment of auxetic tilings for controlled handedness.
  • To demonstrate the fabrication of handed shearing auxetics capable of tiling various surfaces and forming composite structures.

Main Methods:

  • Investigated symmetry and alignment principles in auxetic tilings to induce handedness.
  • Developed rules for creating handed auxetic unit cells that shear upon tension.
  • Applied these rules to design auxetics that tile planar, cylindrical, and spherical geometries.
  • Composited handed shearing auxetics, mimicking natural materials like keratin and collagen.

Main Results:

  • Successfully produced auxetic unit cells with controllable handedness and shear behavior.
  • Demonstrated the ability of these handed auxetics to tile complex surfaces (planes, cylinders, spheres).
  • Created composite structures exhibiting tunable properties, from compliant twisting materials to rigid locking deployable systems.

Conclusions:

  • The developed symmetry and alignment rules enable the creation of novel handed shearing auxetic materials.
  • These materials offer unprecedented control over mechanical responses, including compliance and rigidity.
  • The findings open new avenues for designing advanced materials for applications in chemical frameworks, medical devices, robotics, and deployable structures.