Next Article in Journal
Structural and Luminescence Properties of Lu2O3:Eu3+ F127 Tri-Block Copolymer Modified Thin Films Prepared by Sol-Gel Method
Next Article in Special Issue
Engineering Cellular Photocomposite Materials Using Convective Assembly
Previous Article in Journal
Utilization of an Ionic Liquid/Urea Mixture as a Physical Coupling Agent for Agarose/Talc Composite Films
Previous Article in Special Issue
Advanced Strategies for Articular Cartilage Defect Repair
Materials 2013, 6(2), 699-712; doi:10.3390/ma6020699
Article

Hierarchical Fibers with a Negative Poisson’s Ratio for Tougher Composites

1
 and 2,*
Received: 27 November 2012; in revised form: 9 January 2013 / Accepted: 15 January 2013 / Published: 22 February 2013
(This article belongs to the Special Issue Advances in Bio-inspired Materials)
Download PDF [669 KB, uploaded 22 February 2013]
Abstract: In this paper, a new kind of hierarchical tube with a negative Poisson’s ratio (NPR) is proposed. The first level tube is constructed by rolling up an auxetic hexagonal honeycomb. Then, the second level tube is produced by substituting the arm of the auxetic sheet with the first level tube and rolling it up. The Nth ( ) level tube can be built recursively. Based on the Euler beam theory, the equivalent elastic parameters of the NPR hierarchical tubes under small deformations are derived. Under longitudinal axial tension, instead of shrinking, all levels of the NPR hierarchical tubes expand in the transverse direction. Using these kinds of auxetic tubes as reinforced fibers in composite materials would result in a higher resistance to fiber pullout. Thus, this paper provides a new strategy for the design of fiber reinforced hierarchical bio-inspired composites with a superior pull-out mechanism, strength and toughness. An application with super carbon nanotubes concludes the paper.
Keywords: negative Poisson’s ratio (NPR); hierarchy; super carbon nanotubes (STs); auxetic; pull-out; toughness negative Poisson’s ratio (NPR); hierarchy; super carbon nanotubes (STs); auxetic; pull-out; toughness
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Sun, Y.; Pugno, N. Hierarchical Fibers with a Negative Poisson’s Ratio for Tougher Composites. Materials 2013, 6, 699-712.

AMA Style

Sun Y, Pugno N. Hierarchical Fibers with a Negative Poisson’s Ratio for Tougher Composites. Materials. 2013; 6(2):699-712.

Chicago/Turabian Style

Sun, Yongtao; Pugno, Nicola. 2013. "Hierarchical Fibers with a Negative Poisson’s Ratio for Tougher Composites." Materials 6, no. 2: 699-712.


Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert