Bifurcation Analysis of an Electrostatically Actuated Nano-Beam Based on Modified Couple Stress Theory

2017 ◽  
Vol 18 (1) ◽  
Author(s):  
Araz Rezaei Kivi ◽  
Saber Azizi ◽  
Peyman Norouzi
Keyword(s):  
Bifurcation Analysis ◽  
Couple Stress ◽  
Couple Stress Theory ◽  
Modified Couple Stress Theory ◽  
Stress Theory ◽  
Electrostatically Actuated ◽  
Modified Couple Stress

Characterization of Static Behavior of Electrostatically Actuated Micro Tweezers Using Modified Couple Stress Theory

2012 ◽  
Author(s):  
Ali Darvishian ◽  
Hamid Moeenfard ◽  
Nasser Ghaderi ◽  
Mohammad Taghi Ahmadian
Keyword(s):  
Couple Stress ◽  
Couple Stress Theory ◽  
Beam Theory ◽  
Modified Couple Stress Theory ◽  
Theory Of Elasticity ◽  
Static Behavior ◽  
Design Synthesis ◽  
Stress Theory ◽  
Electrostatically Actuated ◽  
Modified Couple Stress

In this paper, static behavior and pull-in of micro tweezers is studied. The micro tweezer is modelled as two cantilever beams. Static behavior of the micro tweezer under the effect of electrostatic actuation is modelled using the Euler-Bernoulli beam theory. In order to capture size effects on the behavior of micro tweezers, modified couple stress theory is utilized. It is shown when the voltage between two electrodes increased from some specific value, micro beams adhere to each other and it is observed that the pull-in voltage predicted by the modified couple stress theory considerably differs with that of the classical theory of elasticity. Results of this paper can be used for accurate design, synthesis and optimization of micro tweezers.

scholarly journals Size-dependent characteristics of electrostatically actuated fluid-conveying carbon nanotubes based on modified couple stress theory

2013 ◽  
Vol 4 ◽  
pp. 771-780 ◽  
Author(s):  
Mir Masoud Seyyed Fakhrabadi ◽  
Abbas Rastgoo ◽  
Mohammad Taghi Ahmadian
Keyword(s):  
Carbon Nanotubes ◽  
Couple Stress ◽  
Dynamic Properties ◽  
Couple Stress Theory ◽  
Modified Couple Stress Theory ◽  
Stress Theory ◽  
Electrostatically Actuated ◽  
Size Dependent ◽  
Nanoscale System ◽  
Modified Couple Stress

The paper presents the effects of fluid flow on the static and dynamic properties of carbon nanotubes that convey a viscous fluid. The mathematical model is based on the modified couple stress theory. The effects of various fluid parameters and boundary conditions on the pull-in voltages are investigated in detail. The applicability of the proposed system as nanovalves or nanosensors in nanoscale fluidic systems is elaborated. The results confirm that the nanoscale system studied in this paper can be properly applied for these purposes.

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