Abstract
The present research develops a three-dimensional multi-field formulation of a functionally graded piezoelectric thick shell of revolution by using tensor analysis. An orthogonal curvilinear coordinate system was employed, and basic geometric equations were derived for an arbitrary thick shell of revolution with variable thickness and curvature. Mechanical and electrical properties were assumed to vary along a three-dimensional orthogonal coordinate system with arbitrary functional distribution. The functional of the introduced shell was derived by using kinetic and potential energy of the structure based on three orthogonal displacement components, electric potential and material properties. The final differential equations were derived in general state for every arbitrary structure and material property distributions. The obtained equations were reduced for functionally graded and functionally graded piezoelectric cylindrical shells and the mentioned reduced equations were verified by comparison with the literature. Trueness and generality of the present results can be justified by capability of these equations for different geometries and material properties.
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Abbreviations
- A i , B i , C i (i = 1, . . . , 40), D i (i = 1, . . . , 39):
-
The coefficients of the partial time-dependent differential equation of system
- C ijkl :
-
Elastic stiffness coefficient
- D i :
-
Physical components of electric displacement
- E :
-
Modulus of elasticity
- \({\vec{E}, E_i }\) :
-
Vector and components of electric field, respectively
- e ijk :
-
Piezoelectric coefficient
- \({F(u_\psi, u_z, u_\theta, \phi, t)}\) :
-
Functional of the system
- g i :
-
Covariant base vector
- g i :
-
Contra-variant base vector
- g ij :
-
Covariant metric vector
- g ij :
-
Contra-variant metric vector
- l :
-
Nonhomogenous index
- r :
-
Radius of revolution for any arbitrary point
- \({\overline r }\) :
-
Radius of revolution of mid-plane
- ds :
-
Differential distance in meridian direction
- S i , S ij :
-
A symbolic tensor of order one and two, respectively.
- \({u_\psi, u_z, u_\theta }\) :
-
Orthogonal components of displacement in orthogonal coordinate system
- \({\overline u }\) :
-
Total energy per unit volume of the structure
- \({\overline u_p }\) :
-
Potential energy per unit volume of the structure
- \({\overline u_k }\) :
-
Kinetic energy per unit volume of the structure
- \({\dot {u}_\psi, \dot {u}_z, \dot {u}_\theta }\) :
-
Velocity components in the curvilinear coordinate system
- dV :
-
Unit volume of the structure
- X :
-
Position vector of an arbitrary point
- q i , X i :
-
Component of position vector in Cartesian coordinate system
- y :
-
Vertical distance of mid-plane
- z :
-
Second component in the curvilinear coordinate system that describes normal distance of an arbitrary point from the mid-plane
- v :
-
Poisson ratio
- \({\psi }\) :
-
First component in the curvilinear coordinate system that describes the angle between normal to mid-plane and vertical axis (axis of revolution)
- θ :
-
Third component in the curvilinear coordinate system that describes circumferential direction and its angle
- \({\rho_\psi }\) :
-
Distance between mid-plane and axis of revolution along normal to mid-plane
- ρ θ :
-
Meridian radius of curvature
- ρ 1 :
-
\({=\rho_\psi +z}\)
- ρ 2 :
-
= ρ θ + z
- \({\Gamma_{ijk}, \Gamma_{ij}^{k}}\) :
-
Christoffel symbols of first and second kind
- γ ij :
-
Tensor component of strain
- \({\varepsilon_{ij}}\) :
-
Physical component of strain
- \({\phi }\) :
-
Electric potential
- σ ij :
-
Physical components of stress tensor
- η ij :
-
Dielectric coefficient
- \({\vec{\nabla}}\) :
-
Del operator
- \({\|\|}\) :
-
Describes the magnitude of a component
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Arefi, M., Rahimi, G.H. Three-dimensional multi-field equations of a functionally graded piezoelectric thick shell with variable thickness, curvature and arbitrary nonhomogeneity. Acta Mech 223, 63–79 (2012). https://doi.org/10.1007/s00707-011-0536-5
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DOI: https://doi.org/10.1007/s00707-011-0536-5