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Controlling impact mitigation via Bouligand nanostructures.

Sujin R Lee1, Katherine M Evans1, Jeremiah W Woodcock1

  • 1Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899.

Proceedings of the National Academy of Sciences of the United States of America
|May 16, 2025
PubMed
Summary
This summary is machine-generated.

Natural exoskeletons use Bouligand structures for toughness. This study explores synthetic cellulose nanocrystal films to understand impact energy dissipation mechanisms for better material design.

Keywords:
acoustic wave speedsimpact mitigationmechanical propertiesmicroballistic impactnano composites

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Area of Science:

  • Materials Science
  • Biomimetics
  • Mechanics

Background:

  • Natural exoskeletons possess Bouligand structures crucial for toughness and damage resistance.
  • Understanding the structure-function relationship in biological Bouligand materials is limited by complex responses and characterization techniques.

Purpose of the Study:

  • To elucidate the design principles of natural Bouligand structures for impact mitigation.
  • To investigate energy dissipation mechanisms in synthetic Bouligand films.

Main Methods:

  • Fabrication of synthetic Bouligand films using cellulose nanocrystals with controlled pitch and thickness.
  • Quantification of impact performance via coefficient of restitution experiments.
  • Post-impact damage characterization.

Main Results:

  • Two primary energy dissipation mechanisms identified: plastic deformation and acoustic wave attenuation.
  • The transition between these mechanisms is influenced by film thickness, helical pitch, and moisture content.

Conclusions:

  • Synthetic Bouligand films offer a model system to study impact mitigation principles.
  • Controlled variations in film parameters can tune energy dissipation mechanisms for advanced material development.