Modeling the Auxetic Transition for Carbon Nanotube Sheets
Abstract
A simple model is developed to predict the complex mechanical properties of carbon nanotube sheets (buckypaper) [Hall \textit{et al.}, \textit{Science} \textbf{320} 504 (2008)]. Fabricated using a similar method to that deployed for making writing paper, these buckypapers can have in-plane Poisson's ratios changed from positive to negative, becoming auxetic, as multiwalled carbon nanotubes are increasingly mixed with single-walled carbon nanotubes. Essential structural features of the buckypapers are incorporated into the model: isotropic in-plane mechanical properties, nanotubes preferentially oriented in the sheet plane, and freedom to undergo stress-induced elongation by both angle and length changes. The expressions derived for the Poisson's ratios enabled quantitative prediction of both observed properties and remarkable new properties obtainable by structural modification.
Cite
@article{arxiv.0903.2892,
title = {Modeling the Auxetic Transition for Carbon Nanotube Sheets},
author = {Vitor R. Coluci and Lee J. Hall and Mikhail E. Kozlov and Mei Zhang and Socrates O. Dantas and Douglas S. Galvao and Ray H. Baughman},
journal= {arXiv preprint arXiv:0903.2892},
year = {2009}
}
Comments
This is an enlarged version of our previuos work: Sign Change of Poisson's Ratio for Carbon Nanotube Sheets, L. J. Hall, V. R. Coluci, D. S. Galvao, M. E. Kozlov, M. Zhang, S. O. Dantas, and R. H. Baughman, Science v320, 504 (2008)