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Strain rate-dependent mechanical metamaterials.

S Janbaz1, K Narooei2, T van Manen1

  • 1Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, Mekelweg 2, 2628CD Delft, Netherlands.

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|June 30, 2020
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Summary
This summary is machine-generated.

Researchers developed novel strain rate-dependent mechanical metamaterials by combining beams with different material properties. These bi-beams enable predictable control over mechanical behaviors in lattice structures, including auxetic switching and negative viscoelasticity.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Mechanical metamaterials typically exhibit quasi-static behavior.
  • Novel functionalities in metamaterials are often limited by their static nature.

Purpose of the Study:

  • To introduce a new class of strain rate-dependent mechanical metamaterials.
  • To explore the design of bi-beam structures with tunable mechanical responses.

Main Methods:

  • Analytical and computational modeling of bi-beam constructs.
  • Investigating the influence of hyperelastic, viscoelastic properties, and geometric imperfections.
  • Experimental realization of lattice structures using the developed bi-beams.

Main Results:

  • Demonstrated robust and predictable strain rate-dependent behaviors in bi-beams.
  • Achieved switching between auxetic and conventional behaviors in lattice structures.
  • Observed negative viscoelasticity in the designed metamaterials.

Conclusions:

  • Strain rate-dependent mechanical metamaterials offer unprecedented functionalities.
  • Bi-beam design provides a versatile platform for engineering dynamic material responses.
  • This work opens new avenues for advanced material design with tunable dynamic properties.