Page 91 - MSAM-2-4

Materials Science in

Additive Manufacturing

ORIGINAL RESEARCH ARTICLE
An experimental study on 3D-printed

continuous fiber-reinforced composite auxetic
structures

Peiqing Liu and Jikai Liu *
1,2
1,2
1 Center for Advanced Jet Engineering Technologies (CaJET), Key Laboratory of High Efficiency
and Clean Mechanical Manufacture (Ministry of Education), School of Mechanical Engineering,
Shandong University, Jinan, Shandong, China
2 Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong
University, Jinan, Shandong, China

Abstract

Auxetic structures have negative Poisson’s ratios (NPR). Due to the unique deformation
mechanism, auxetic structures possess extraordinary mechanical properties, such as
indentation resistance, shear resistance, fracture toughness, and energy absorption
capability. However, the stiffness and load-bearing capacity are the weak points for
auxetic structures. 3D printing of continuous fiber-reinforced composite enables the
fabrication of lightweight and highly stiff complex structures, providing a perfect
manufacturing method to remedy the shortcomings of auxetic structures. This work
investigated the mechanical properties of 3D-printed continuous fiber-reinforced
composite auxetic structures. In this study, we utilized continuous fiber-reinforced
composite 3D printing to fabricate two types of auxetic structures. The fiber path
*Corresponding author:
Jikai Liu configurations were varied among the test specimens to explore the effect of fiber
(jikai_liu@sdu.edu.cn) distribution on mechanical properties. A uniaxial tensile test was performed to
evaluate the tensile properties and Poisson’s ratio of continuous fiber-reinforced
Citation: Liu P, Liu J, 2023, An
experimental study on 3D-printed composite auxetic structures. Results showed that the tensile modulus and strength
continuous fiber-reinforced have been dramatically improved with a minor mass increase. The auxetic behavior
composite auxetic structures. Mater can be strengthened by properly allocating the reinforcing fibers. However, the
Sci Add Manuf, 2(4): 2159.
https://doi.org/10.36922/msam.2159 addition of continuous fiber led to different performances on the selected auxetic
structures. In summary, two out of the five specimens demonstrated simultaneous
Received: November 2, 2023
improvements in stiffness, strength, and auxeticity across the conducted tests.
Accepted: November 29, 2023
Published Online: December 12, Keywords: Auxetic structures; Continuous fiber-reinforced composites; Additive
2023
manufacturing
Copyright: © 2023 Author(s).
This is an Open-Access article
distributed under the terms of the
Creative Commons Attribution
License, permitting distribution, 1. Introduction
and reproduction in any medium,
provided the original work is Auxetic materials are materials that have a negative Poisson’s ratio (NPR). Applying
properly cited. stretching (compressive) load on the auxetic material results in a lateral expansion
Publisher’s Note: AccScience (contraction). The unusual deformation mechanism gives them excellent mechanical
Publishing remains neutral with properties, such as resistance of indentation , resistance to shear , fracture toughness [3,4]
[1]
[2]
regard to jurisdictional claims in [5]
published maps and institutional and energy absorption capability . Due to its superior properties, auxetic materials
[6]
[1]
[7]
affiliations. have potential applications in different fields, such as aerospace , sports , medicine ,
Volume 2 Issue 4 (2023) 1 https://doi.org/10.36922/msam.2159