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This study introduces a novel 3D metamaterial with engineered zero modes, enabling reversible transformations between solid and near-gaseous states. This breakthrough allows for qualitative changes in metamaterial properties and functionalities.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Flexible metamaterial design relies on zero modes for reconfigurable elastic properties.
  • Current designs often achieve quantitative property enhancement but lack qualitative state transformation due to unsystematic zero-mode engineering.

Purpose of the Study:

  • To propose and experimentally demonstrate a 3D metamaterial with engineered zero modes for transformable static and dynamic properties.
  • To achieve qualitative transformation of metamaterial states and functionalities.

Main Methods:

  • Design of a 3D metamaterial incorporating engineered zero modes.
  • Experimental verification using 3D-printed Thermoplastic Polyurethanes prototypes.
  • Investigation of tunable wave manipulations in 1D, 2D, and 3D systems.

Main Results:

  • Demonstrated reversible transformations between all seven types of extremal metamaterials, from null-mode (solid) to hexa-mode (near-gaseous) states.
  • Verified the transformable properties of the 3D-printed prototypes.
  • Showcased tunable wave manipulation capabilities across different dimensionalities.

Conclusions:

  • Engineered zero modes provide a systematic approach for qualitative transformations in flexible metamaterials.
  • The proposed metamaterial design offers unprecedented control over static and dynamic properties.
  • Potential applications extend beyond mechanical systems to electromagnetics, thermal management, and other fields.