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A Three Dimensional Unit Cell Model for the Analysis of Thermal Residual Stresses in Polymer Composites Reinforced with Wavy Carbon Nanotubes

Published online by Cambridge University Press:  29 November 2019

Y. Zhang ,
A. Johnston ,
A. Yousefpour ,
J. Guan ,
B. Simard  and
C. Kingston
Y. Zhang*
Affiliation:
National Research Council Canada, 1200 Montreal Road, Ottawa ON, Canada K1A 0R6
A. Johnston
Affiliation:
National Research Council Canada, 1200 Montreal Road, Ottawa ON, Canada K1A 0R6
A. Yousefpour
Affiliation:
National Research Council Canada, 1200 Montreal Road, Ottawa ON, Canada K1A 0R6
J. Guan
Affiliation:
National Research Council Canada, 1200 Montreal Road, Ottawa ON, Canada K1A 0R6
B. Simard
Affiliation:
National Research Council Canada, 1200 Montreal Road, Ottawa ON, Canada K1A 0R6
C. Kingston
Affiliation:
National Research Council Canada, 1200 Montreal Road, Ottawa ON, Canada K1A 0R6
*
*(Email: Yunfa.Zhang@nrc-cnrc.gc.ca)
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Abstract

This paper presents a numerical approach to predict the thermal residual stresses in polymer nanocomposites reinforced with a periodic array of wavy carbon nanotubes. A three dimensional unit cell model is established to accurately account for the waviness of the nanotube. Periodic boundary conditions are determined for the unit cell with a pair of curved surfaces. Appropriate methods to evaluate the macroscopic stresses and strains are also determined for the unit cell model in which the interior pores of the nanotubes are explicitly included. It is demonstrated that the macroscopic behavior of the nanocomposites is orthotropic due to the symmetries manifested. By employing material properties of the two constituents, the thermal residual stresses and strains induced by high temperature curing and cooling-down are predicted for an epoxy/wavy-nanotube composite. It is also demonstrated that the curing process tends to increase the waviness of the nanotube and the waviness has a significant influence on the distribution of the microscopic residual stresses.

Keywords

compositemicrostructurethermal stressesmodeling
Type
Articles
Information
MRS Advances , Volume 5 , Issue 33-34: Mechanical Behavior and Structural Materials , 2020 , pp. 1739 - 1748
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Copyright
Copyright © Materials Research Society 2019

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