Abstract
Finite element method (FEM) and generalized differential quadrature method (GDQM) are developed for damping vibration analysis of viscoelastic axially functionally graded (VAFG) nanobeams within the framework of stress-driven nonlocal integral model (SDM). The equivalent differential law of SDM and two constitutive non-classic boundary conditions (CBCs) are utilized to construct FE and GDQ models. In FEM, three different types of beam elements are derived: two different types for the both ends of the nanobeam and another type for elements located in the middle of nanobeam. Convergence and accuracy of the present FEM and GDQM are evaluated, and it is shown that the present results and formulations are efficient and reliable. Also, in the damping vibration analysis of VAFG nanobeams by SDM, variations of the mechanical properties are considered as a power-law function. After validation of present results and mathematical modeling, various benchmark results are presented to determine the influences of several parameters, such as nonlocal SDM parameter, FG index and damping factor on both parts of size-dependent complex frequencies of VAFG nanobeams with different boundary conditions.
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Abbreviations
- \( E_{\text{l}} \), \( E_{\text{r}} \) :
-
Young’s modulus in left and right side of nanobeam
- \( \rho_{\text{l}} \), \( \rho_{\text{r}} \) :
-
Mass density in left and right side of nanobeam
- \( \eta_{\text{l}} \), \( \eta_{\text{r}} \) :
-
Damping factor in left and right side of nanobeam
- \( E\left( x \right) \) :
-
Variable Young’s modulus
- \( \rho \left( x \right) \) :
-
Variable mass density
- \( \eta \left( x \right) \) :
-
Variable damping factor
- c :
-
Non-dimensional damping parameter
- L :
-
Length of nanobeam
- b :
-
Width of nanobeam
- H :
-
Thickness of nanobeam
- x, y, z :
-
Cartesian coordinate system
- \( \Im_{\text{eff}} \) :
-
Effective material properties of nanobeam
- \( \Im_{\text{l}} \), \( \Im_{\text{r}} \) :
-
Material properties in left and right side of nanobeam
- \( V_{\text{l}} \left( x \right) \) :
-
Volume fraction of material in left side of nanobeam
- np :
-
FG index
- \( \varepsilon_{xx} \) :
-
Axial strain
- \( \sigma_{xx} \) :
-
Normal stress
- k :
-
Nonlocal parameter
- \( \mu \) :
-
Non-dimensional nonlocal parameter
- I :
-
Moment of inertia of the cross section
- M :
-
Bending moment
- A :
-
Area of the cross section
- \( w\left( {x,t} \right) \) :
-
Transverse displacement
- \( T\left( t \right) \) :
-
Time response function
- t :
-
Time
- \( m_{1} \) :
-
Mass distribution per length
- \( \omega \) :
-
Vibration frequency
- \( \left[ M \right] \) :
-
Mass matrix
- \( \left[ {Ks} \right] \) :
-
Strain stiffness matrix
- \( \left[ D \right] \) :
-
Damping matrix
- \( ng \) :
-
Number of grid points
- \( x_{i} \) :
-
Location of grid points
- \( H_{ij}^{\left( r \right)} \) :
-
Hermite shape functions
- \( U_{\text{b}} \), \( U_{\text{d}} \) :
-
Boundary and domain grid points
- \( {\mathbb{Z}} \) :
-
State vector
- \( \left[ S \right] \) :
-
State matrix
- \( \bar{\mathbb{Z}} \) :
-
Eigenvectors
- \( \left[ I \right] \) :
-
Identity matrix
- \( \zeta \) :
-
Ratio of \( \eta_{\text{r}} /\eta_{\text{l}} \)
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Appendix
Appendix
1.1 Shape functions of element-1
1.2 Shape functions of element-2
1.3 Shape functions of element-3
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Fakher, M., Behdad, S. & Hosseini-Hashemi, S. Vibration analysis of stress-driven nonlocal integral model of viscoelastic axially FG nanobeams. Eur. Phys. J. Plus 135, 905 (2020). https://doi.org/10.1140/epjp/s13360-020-00923-6
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DOI: https://doi.org/10.1140/epjp/s13360-020-00923-6