We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Dynamic stability of smart sandwich nanotubes based on modified couple stress theory using differential quadrature method (DQM).
- Authors
Nasiri-Khouzani, Hamidreza; Salmani-Tehrani, Mehdi; Farrokhian, Ahmad
- Abstract
In this paper, dynamic stability of a smart sandwich nanotube is investigated. The core of the nanostructure is made from a single-walled carbon nanotube (SWCNT), which is coated with two ZnO piezoelectric layers. The inner piezoelectric layer is taken as a sensor and the outer layer as an actuator. The sandwich nanotube is embedded in an elastic visco-Pasternak medium. The modified couple stress theory is utilized to consider the small-scale effect, and the Kelvin-Voigt model is used to model the carbon nanotube and the ZnO layers. The surface tension is taken into account using the Gurtin–Murdoch theory. The nonlinear governing equations, derived by the Hamilton principle, are solved using differential quadrature method (DQM), to investigate dynamic stability range, and to calculate natural frequencies. The results of this study are compared against existing similar data in the literature, presented for some simpler cases. Then, the effect of various parameters, including the small scale parameter, the ratio of piezoelectric layer thickness to nanotube thickness, surface stresses, the visco-elastic foundation effect, the magnetic field effect, and the electrical polarity are scrutinized on the system dynamic stability range. The results indicate that consideration of the small scale can reduce the transverse displacement and frequency while increasing the thickness of the piezoelectric layer leads to a higher frequency. Moreover, incorporating the surface stresses into the model can increase the stability. Using the modified couple stress theory can be considered the main novelty of this paper.
- Subjects
STRAINS &; stresses (Mechanics); DIFFERENTIAL quadrature method; DYNAMIC stability; MAGNETIC field effects; CARBON nanotubes; NANOTUBES; LAMINATED composite beams
- Publication
Acta Mechanica, 2023, Vol 234, Issue 10, p5147
- ISSN
0001-5970
- Publication type
Article
- DOI
10.1007/s00707-023-03654-8