A Sinusoidally-Architected Helicoidal Biocomposite
Nicholas A. Yaraghi, Nicol\'as Guar\'in-Zapata, Lessa K. Grunenfelder,, Eric Hintsala, Sanjit Bhowmick, Jon M. Hiller, Mark Betts, Edward L., Principe, Jae-Young Jung, Leigh Sheppard, Richard Wuhrer, Joanna McKittrick,, Pablo D. Zavattieri, David Kisailus
TL;DR
This paper uncovers a novel fibrous helicoidal biocomposite in crustacean exocuticle, revealing its microstructure and toughening mechanisms that improve stress distribution and energy absorption under compression.
Contribution
It reports a previously uncharacterized helicoidal architecture with mineral templating, advancing understanding of biological composite microstructures.
Findings
Identified a unique fibrous helicoidal microstructure in crustacean exocuticle.
Demonstrated enhanced stress redistribution and energy absorption due to this architecture.
Revealed nanoscale toughening mechanisms via nanoindentation and TEM analysis.
Abstract
A fibrous herringbone-modified helicoidal architecture is identified within the exocuticle of an impact-resistant crustacean appendage. This previously unreported composite microstructure, which features highly textured apatite mineral templated by an alpha-chitin matrix, provides enhanced stress redistribution and energy absorption over the traditional helicoidal design under compressive loading. Nanoscale toughening mechanisms are also identified using high load nanoindentation and in-situ TEM picoindentation.
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