Modified continuum model for stability analysis of asymmetric FGM double-sided NEMS: Corrections due to finite conductivity, surface energy and nonlocal effect

Finite conductivity, surface energy and nonlocal effect can influence the electromechanical performance of micro/nano-electromechanical systems (MEMS/NEMS). However, these factors are yet ignored on stability analysis of MEMS/NEMS fabricated from functionally graded materials (FGM). In this paper, d...

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Bibliographic Details
Published in:Composites. Part B, Engineering Engineering, 2015-12, Vol.83, p.117-133
Main Authors: Sedighi, Hamid M., Keivani, Maryam, Abadyan, Mohamadreza
Format: Article
Language:English
Subjects:
A. Nano-structures
B. Vibration
C. Micro-mechanics
Dynamics
Functionally gradient materials
Mathematical analysis
Mathematical models
Nanoelectromechanical systems
Nanostructure
Stability analysis
Surface energy
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Summary:Finite conductivity, surface energy and nonlocal effect can influence the electromechanical performance of micro/nano-electromechanical systems (MEMS/NEMS). However, these factors are yet ignored on stability analysis of MEMS/NEMS fabricated from functionally graded materials (FGM). In this paper, dynamic stability of double-sided NEMS fabricated from non-symmetric FGM is investigated incorporating finite conductivity, surface energy and nonlocal effect. The Gurtin–Murdoch model and Eringen's elasticity are employed to consider the surface energy and nonlocal effect, respectively. Effect of finite conductivity of FGM on electrostatic and Casimir attractions is incorporated via relative permittivity and plasma frequency of the material. The stability analysis of the nanostructure is conducted by plotting time history and phase portraits. Moreover, bifurcation analysis is conducted to investigate the stability of the fixed points of the nano-structure. The validity of the proposed model is examined by comparing the results of the present study with those reported in the literature. The impact of various parameters i.e. finite conductivity, nonlocal parameter, surface stresses and material characteristics on the dynamic instability of the NEMS are addressed.
ISSN:1359-8368
1879-1069
DOI:10.1016/j.compositesb.2015.08.029