Free vibration of thermo-electro-mechanically postbuckled FG-CNTRC beams with geometric imperfections

Wu, H, Kitipornchai, S and Yang, J 2018, 'Free vibration of thermo-electro-mechanically postbuckled FG-CNTRC beams with geometric imperfections', Steel and Composite Structures, vol. 29, no. 3, pp. 319-332.

Document type: Journal Article
Collection: Journal Articles

Title Free vibration of thermo-electro-mechanically postbuckled FG-CNTRC beams with geometric imperfections
Author(s) Wu, H
Kitipornchai, S
Yang, J
Year 2018
Journal name Steel and Composite Structures
Volume number 29
Issue number 3
Start page 319
End page 332
Total pages 14
Publisher Techno Press
Abstract This paper investigates the free vibration of geometrically imperfect functionally graded car-bon nanotubereinforced composite (FG-CNTRC) beams that are integrated with two sur-face-bonded piezoelectric layers and subjected to a combined action of a uniform temperature rise, a constant actuator voltage and an in-plane force. The material properties of FGCNTRCs are assumed to be temperature-dependent and vary continuously across the thick-ness. A generic imperfection function is employed to simulate various possible imperfections with different shapes and locations in the beam. The governing equations that account for the influence of initial geometric imperfection are derived based on the first-order shear deformation theory. The postbuckling configurations of FG-CNTRC hybrid beams are determined by the differential quadrature method combined with the modified Newton-Raphson technique, after which the fundamental frequencies of hybrid beams in the postbuckled state are obtained by a standard eigenvalue algorithm. The effects of CNT distribution pattern and volume fraction, geometric imperfection, thermo-electro-mechanical load, as well as boundary condition are examined in detail through parametric studies. The results show that the fundamental frequency of an imperfect beam is higher than that of its perfect counterpart. The influence of geometric imperfection tends to be much more pronounced around the critical buckling temperature.
Subject Solid Mechanics
Keyword(s) Carbon nanotube-reinforced composites
Free vibration
Functionally graded materials
Piezoelectric materials
Thermo-electro-mechanical load
DOI - identifier 10.12989/scs.2018.29.3.319
Copyright notice © 2018 Techno-Press, Ltd.
ISSN 1229-9367
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