Tough nature-inspired helicoidal composites with printing-induced voids

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Xu, J., Yin, S., Chen, H., & Yang, R. (2020). Tough nature-inspired helicoidal composites with printing-induced voids. Cell Reports Physical Science. https://doi.org/doi:10.1016/j.xcrp.2020.100109
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Faculty, Exoskeletons of Odontodactylus japonicas, the smasher-type mantis shrimp, feature a raptorial appendage comprising a Bouligand architecture of chitin nanofibrils with newly observed voids or defects between the polysaccharide alpha-chitin and protein interfaces. Here, we use a continuous-fiber 3D printing technology to simulate such materials in carbon fiber-reinforced (helicoidal) composites, complete with the presence of voids due to imperfect printing. The specific impact energies of the 3D printed helicoidal composites are clearly superior and further enhanced by the presence of the voids. To explain the role of the Bouligand architecture, interlaminar stresses are computed and found to yield anti-delamination characteristics, and a theoretical model is derived to evaluate the optimal helicoidal architecture. Finite element modeling indicates that the voids tend to deform and coalesce on loading and appear to guide the fracture into the formation of an ideally twisted crack in the printed helicoidal composites, thereby contributing to the impact toughness.

Details
Title

Tough nature-inspired helicoidal composites with printing-induced voids

Author(s)

Xu, Jun
Yin, Sha
Chen, Haoyu
Yang, Ruiheng

UNC Charlotte Affiliate Type

Faculty

Extent

1 online resource

Date Created

2020

Genre

articles

Resource Type

text

Abstract

Exoskeletons of Odontodactylus japonicas, the smasher-type mantis shrimp, feature a raptorial appendage comprising a Bouligand architecture of chitin nanofibrils with newly observed voids or defects between the polysaccharide alpha-chitin and protein interfaces. Here, we use a continuous-fiber 3D printing technology to simulate such materials in carbon fiber-reinforced (helicoidal) composites, complete with the presence of voids due to imperfect printing. The specific impact energies of the 3D printed helicoidal composites are clearly superior and further enhanced by the presence of the voids. To explain the role of the Bouligand architecture, interlaminar stresses are computed and found to yield anti-delamination characteristics, and a theoretical model is derived to evaluate the optimal helicoidal architecture. Finite element modeling indicates that the voids tend to deform and coalesce on loading and appear to guide the fracture into the formation of an ideally twisted crack in the printed helicoidal composites, thereby contributing to the impact toughness.

Subjects--Topics

Three-dimensional modeling
Three-dimensional printing

Is Part Of

Cell reports physical science

Language

English

Published Version (Please cite this version)

doi:10.1016/j.xcrp.2020.100109

Publisher's Version

https://doi.org/10.1016/j.xcrp.2020.100109

Permalink

http://hdl.handle.net/20.500.13093/work:1072

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