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Updated: Mar 21, 2026

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Inherently Disordered Auxetic Metamaterials.

Matteo Montanari1, Reza Moghimimonfared1, Andrea Spaggiari1

  • 1Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, Reggio Emilia, Italy.

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PubMed
Summary

Disordered auxetic metamaterials with chiral honeycomb structures exhibit large auxetic behavior independent of disorder. Their stiffness is tunable via seed density, offering new possibilities beyond ordered designs.

Keywords:
auxeticsdelaunay triangulationsdisordermechanical metamaterials

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Area of Science:

  • Materials Science
  • Metamaterials
  • Mechanical Engineering

Background:

  • Traditional metamaterials often rely on ordered structures for advanced functionalities like auxeticity.
  • Inherently disordered systems offer potential for novel properties but lack systematic exploration.
  • Auxetic materials exhibit a negative Poisson's ratio, expanding when stretched.

Purpose of the Study:

  • To propose and investigate disordered auxetic metamaterial frameworks.
  • To explore the relationship between disorder, chiralization, and auxetic behavior.
  • To assess the tunability of mechanical properties and the impact on failure mechanisms.

Main Methods:

  • Design of disordered frameworks using Delaunay-triangulation incorporating chiral honeycomb features.
  • Extensive parametric finite element analysis.
  • Experimental validation of simulation results.

Main Results:

  • Demonstrated large auxetic behavior in disordered systems, dependent on chiralization, not disorder extent.
  • Tunable Young's modulus via seed density without compromising auxeticity.
  • Disordered topology significantly alters failure pathways and deformation propagation compared to ordered counterparts.

Conclusions:

  • Advanced functionalities like auxeticity are achievable in disordered metamaterials.
  • Harnessing disorder offers a pathway to superior properties not found in traditional ordered metamaterials.
  • Chiralization is key to auxeticity in these disordered frameworks.