Effect of Negative Poisson's Ratio on the Tensile Properties of Auxetic CFRP Composites

Wenhua Lin, Yeqing Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Carbon fiber reinforced polymer (CFRP) matrix composites have become increasingly popular across industries such as aerospace and automotive industries due to its outstanding mechanical properties and significant weight saving capability. CFRP composites are also widely known to be highly tailorable. For instance, different laminate-level mechanical properties for CFRP composites can be achieved by varying the individual carbon fiber laminar arrangements, among one of them is the Poisson's ratio. Conventional materials have a positive Poisson's ratio (PPR), visualize any conventional materials in a 2D block shape, when stretching that material in longitudinal direction, contraction follows on the transverse direction, whereas for materials with a negative Poisson's ratio (NPR), stretching in the longitudinal direction leads to expansion in the transverse direction. Materials with NPRs have been shown to improve the indentation and impact resistances, when compared to equivalent materials with PPRs. However, producing NPRs could potentially compromise other properties, such as tensile properties, which has not been reported. The current work investigates the effects of NPR on the tensile properties of CFRP composites. Specifically, a laminate-level NPR of -0.4094 in the in-plane direction is achieved through ply arrangement of CFRP composites using classical lamination theory (CLT). The non-auxetic counterpart CFRP composites are designed to produce an PPR of 0.1598 in the in-plane direction while simultaneously match their elastic moduli in three directions with those of the auxetic composites. Results show that the predicted tensile modulus and in-plane Poisson's ratio were in excellent agreement with the experiment results. It was found that the ultimate tensile strength and failure strain or ductility of auxetic specimens were on average 40% lower than those of the conventional CFRP composites.

Original languageEnglish (US)
Title of host publicationProceedings of the American Society for Composites - 37th Technical Conference, ASC 2022
EditorsOlesya Zhupanska, Erdogan Madenci
PublisherDEStech Publications Inc.
ISBN (Electronic)9781605956909
StatePublished - 2022
Event37th Technical Conference of the American Society for Composites, ASC 2022 - Tucson, United States
Duration: Sep 19 2022Sep 21 2022

Publication series

NameProceedings of the American Society for Composites - 37th Technical Conference, ASC 2022

Conference

Conference37th Technical Conference of the American Society for Composites, ASC 2022
Country/TerritoryUnited States
CityTucson
Period9/19/229/21/22

ASJC Scopus subject areas

  • Ceramics and Composites

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