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Journal of Nanomaterials
Volume 2008, Article ID 834248, 6 pages
Research Article

Effects of CNT Diameter on the Uniaxial Stress-Strain Behavior of CNT/Epoxy Composites

Department of Mechanical Engineering, College of Engineering, Yuan Ze University, Taiwan135 Yuan-Tung Road, Chungli 32003, Taiwan

Received 21 February 2008; Revised 15 June 2008; Accepted 6 August 2008

Academic Editor: Ching Ping Wong

Copyright © 2008 N. Yu and Y. W. Chang. 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.


The present work studies the effects of the diameter of carbon nanotube (CNT) as well as CNT weight fraction on the uniaxial stress-strain behavior, stiffness, and strength of CNT-reinforced epoxy-matrix composites. The experimental results show that average Young's moduli of 5 wt%-CNT/epoxy composites with a CNT diameter  nm and  nm are 4.56 GPa and 4.36 GPa, and the average tensile strengths are 52.89 MPa and 46.80 MPa, respectively, which corresponds to a percentage increase of 61.1%, 54.1%, 106%, and 82.3%, respectively. Two micromechanics models are employed and the predicted Young's moduli are benchmarked with the experimental data of MWCNT-reinforced epoxy-matrix composites.