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Granular metamaterials with dynamic bond reconfiguration.

Zhiqiang Meng1, Hujie Yan2, Yifan Wang1

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

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|December 4, 2024
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Summary

This study introduces granular metamaterials that dynamically reconfigure like biological systems. These adaptable materials offer tunable mechanical properties and enable programmable functionalities for robotics and architecture.

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Area of Science:

  • Materials Science
  • Robotics
  • Biomimicry

Background:

  • Biological materials exhibit dynamic structural reconfiguration for adaptability and multifunctionality.
  • Conventional mechanical metamaterials possess fixed structures, limiting their adaptability.
  • A need exists for reconfigurable materials that bridge the gap between biological adaptability and engineered structures.

Purpose of the Study:

  • To introduce and investigate granular metamaterials with dynamic bond reconfiguration capabilities.
  • To explore the adaptive shape-changing and mechanical property tuning of these granular metamaterials.
  • To demonstrate the potential of granular metamaterials in collective behaviors and reprogrammable functionalities.

Main Methods:

  • Fabrication of discrete bimaterial structured particles.
  • Application of mechanical compression and thermal stimuli to induce state transitions.
  • Characterization of mechanical properties (compression, shearing, bending) in different states.
  • Observation and analysis of collective behaviors such as movement and object capture.

Main Results:

  • Granular metamaterials transition between assembled and unassembled states via stimuli.
  • Reversible bond breaking and formation enable dynamic reconfiguration, mimicking natural systems.
  • Tunable mechanical properties (compression, shearing, bending) were observed across different states.
  • Demonstrated collective behaviors including directional movement, object capture, transportation, and gap crossing.

Conclusions:

  • Granular metamaterials offer dynamic reconfigurability and robust adaptability.
  • These materials present a pathway towards responsive architecture and autonomous robotics.
  • The discrete, reconfigurable nature allows for adaptive responses to varying environmental conditions.