Imperfection sensitivity of postbuckling behaviour of functionally graded carbon nanotube-reinforced composite beams

Wu, H, Yang, J and Kitipornchai, S 2016, 'Imperfection sensitivity of postbuckling behaviour of functionally graded carbon nanotube-reinforced composite beams', Thin-Walled Structures, vol. 108, pp. 225-233.


Document type: Journal Article
Collection: Journal Articles

Title Imperfection sensitivity of postbuckling behaviour of functionally graded carbon nanotube-reinforced composite beams
Author(s) Wu, H
Yang, J
Kitipornchai, S
Year 2016
Journal name Thin-Walled Structures
Volume number 108
Start page 225
End page 233
Total pages 9
Publisher Elsevier
Abstract The imperfection sensitivity of the postbuckling behaviour of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) beams subjected to axial compression is investigated based on the first-order shear deformation beam theory with a von Kármán geometric nonlinearity. The material properties of FG-CNTRC are assumed to vary in the beam thickness direction and are estimated according to the extended rule of mixture. The differential quadrature method is employed to discretize the governing differential equations and the modified Newton-Raphson iterative technique is used to obtain the postbuckling equilibrium paths of FG-CNTRC beams with various imperfections. Parametric studies are carried out to examine the effects of imperfection modes, half-wave number, location, and amplitude on the postbuckling response of beams. The influences of CNT distribution pattern and volume fraction, boundary conditions, and slenderness ratio are also discussed. Numerical results in graphical form show that the postbuckling behaviour is highly sensitive to the imperfection amplitude. The imperfection mode and its half-wave number also moderately affect the imperfection sensitivity of the postbuckling response, whereas the effects of other parameters are much less pronounced.
Subject Solid Mechanics
Structural Engineering
Keyword(s) Carbon nanotube reinforced composites
Differential quadrature method
Functionally graded materials
Imperfection sensitivity
Postbuckling
DOI - identifier 10.1016/j.tws.2016.08.024
Copyright notice © 2016 Elsevier
ISSN 0263-8231
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