Exploiting negative Poisson's ratio to design 3D-printed composites with enhanced mechanical properties

Li, Tiantian; Chen, Yanyu; Hu, Xiaoyi; Li, Yangbo; Wang, Lifeng

doi:10.1016/j.matdes.2018.01.034

Title: Exploiting negative Poisson's ratio to design 3D-printed composites with enhanced mechanical properties

Journal Article · Sat Feb 03 00:00:00 UTC 2018 · Materials & Design

DOI: https://doi.org/10.1016/j.matdes.2018.01.034 · OSTI ID:1424903

Li, Tiantian ^[1]; Chen, Yanyu ^[2]; Hu, Xiaoyi ^[1]; Li, Yangbo ^[3]; Wang, Lifeng ^[1]

Stony Brook Univ., NY (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Stony Brook Univ., NY (United States); China Three Gorges Univ., Hubei (China)

Auxetic materials exhibiting a negative Poisson's ratio are shown to have better indentation resistance, impact shielding capability, and enhanced toughness. Here, we report a class of high-performance composites in which auxetic lattice structures are used as the reinforcements and the nearly incompressible soft material is employed as the matrix. This coupled geometry and material design concept is enabled by the state-of-the-art additive manufacturing technique. Guided by experimental tests and finite element analyses, we systematically study the compressive behavior of the 3D printed auxetics reinforced composites and achieve a significant enhancement of their stiffness and energy absorption. This improved mechanical performance is due to the negative Poisson's ratio effect of the auxetic reinforcements, which makes the matrix in a state of biaxial compression and hence provides additional support. This mechanism is further supported by the investigation of the effect of auxetic degree on the stiffness and energy absorption capability. The findings reported here pave the way for developing a new class of auxetic composites that significantly expand their design space and possible applications through a combination of rational design and 3D printing.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: National Science Foundation (NSF); Office of Naval Research

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1424903

Report Number(s):: NREL/JA--5400-71053

Journal Information:: Materials & Design, Journal Name: Materials & Design Journal Issue: C Vol. 142; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
3D printing
auxetics
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energy absorption
lattice materials
stiffness

Title: Exploiting negative Poisson's ratio to design 3D-printed composites with enhanced mechanical properties

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