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circular-cylindrical-shells
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Decoupled stability equation for buckling analysis of FG and multilayered cylindrical shells based on the first-order shear deformation theory
, Article Composites Part B: Engineering ; Volume 154 , 2018 , Pages 225-241 ; 13598368 (ISSN) ; Taati, E ; Asghari, M ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
Based on the first-order shear deformation and Donnell's shell theory with von Karman non-linearity, one decoupled stability equation for buckling analysis of functionally graded (FG) and multilayered cylindrical shells with transversely isotropic layers subjected to various cases of combined thermo-mechanical loadings is developed. To this end, the equilibrium equations are uncoupled in terms of the transverse deflection, the force function and a new potential function. Using the adjacent equilibrium method, one decoupled stability equation which is an eighth-order differential equation in terms of transverse deflection is obtained and conveniently solved to present analytical expressions...
Buckling analysis of nonlocal anisotropic thin-walled cylindrical shells subject to combined loading
, Article Journal of Engineering Mechanics ; Volume 142, Issue 12 , 2016 ; 07339399 (ISSN) ; Fazelzadeh, S. A ; Sohrabpour, S ; Sharif University of Technology
American Society of Civil Engineers (ASCE)
2016
Abstract
The equilibrium governing equations of nonlocal anisotropic thin-walled circular cylindrical shell under combined axial compressive force, torsional load, and external pressure are explicitly derived. This is accomplished by appropriately combining the equilibrium equations and the strain-displacement relations according to Flügge's shell theory and the stress-stain equations of Eringen's nonlocal elasticity theory. An analytical solution for the buckling of the shells is presented by using the complex method. This model is validated by a good agreement between the results given by the present model and available data in the literature. Furthermore, the model is utilized to elucidate the...
On the instability of spinning cylindrical shells partially filled with liquid
, Article International Journal of Structural Stability and Dynamics ; Volume 12, Issue 3 , 2012 ; 02194554 (ISSN) ; Permoon, M. R ; Haddadpour, H ; Sharif University of Technology
Abstract
The dynamics and stability of rotating circular cylindrical shells partially filled with ideal liquid is analyzed. The structural dynamics of the shell is modeled by using the first-order shear deformable shell theory and the flow inside the cylinder is simulated by a quasi 2D model based on the NavierStokes equations for ideal liquid. The fluid and structural models are combined using the nonpenetration condition of the flow on the wetted surface of the cylinder and the fluid pressure on the flexible shell. The obtained fluidstructure model is employed for the determination of the stable regions of the spinning frequency of the cylinder. A series of case studies are performed on the...
Out-of-plane stresses in composite shell panels: Layerwise and elasticity solutions
, Article Acta Mechanica ; Volume 220, Issue 1-4 , 2011 , Pages 15-32 ; 00015970 (ISSN) ; Nosier, A ; Sharif University of Technology
Abstract
Boundary-layer effects in lengthy cross-ply laminated circular cylindrical shell panels under uniform axial extension are investigated by two analytical solutions. First, Reddy's layerwise theory with state-space approach is utilized to determine the local interlaminar stresses. In this method, the general displacement field is discretized through the shell thickness by a linear shape function. When the shell panel is subjected to an axial force, the axial strain is estimated by an equivalent single-layer theory. Second, the stress-function approach along with Fourier series expansion is applied to develop a novel elasticity solution. The elasticity solution, which is based on simply-support...
Boundary-layer hygrothermal stresses in laminated, composite, circular, cylindrical shell panels
, Article Archive of Applied Mechanics ; Volume 80, Issue 4 , 2010 , Pages 413-440 ; 09391533 (ISSN) ; Miri, A. K ; Sharif University of Technology
Abstract
Free-edge effects in laminated, circular, cylindrical shell panels subjected to hygrothermal loading are studied by utilizing displacement-based technical theories. Starting from the most general displacement field of elasticity for long, circular, cylindrical shells, appropriate reduced displacement fields are determined for laminated composite shell panels with cross-ply and antisymmetric angle-ply layups. An equivalent single-layer shell theory is used to analytically determine the constant parameters appearing in the reduced displacement fields. A layerwise shell theory is then employed to analytically determine the local displacement functions and the boundary-layer interlaminar...
Free vibration of bi-material cylindrical shells
, Article Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science ; Volume 230, Issue 15 , 2016 , Pages 2637-2649 ; 09544062 (ISSN) ; Foumani, M. S ; Navazi, H. M ; Sharif University of Technology
SAGE Publications Ltd
2016
Abstract
Based on the Sanders thin shell theory, this paper presents an exact solution for the vibration of circular cylindrical shell made of two different materials. The shell is sub-divided into two segments and the state-space technique is employed to derive the homogenous differential equations. Then continuity conditions are applied where the material of the cylindrical shell changes. Shells with various combinations of end boundary conditions are analyzed by the proposed method. Finally, solving different examples, the effect of geometric parameters as well as BCs on the vibration of the bi-material shell is studied
Free vibration analysis of cylindrical shells partially resting on an elastic foundation
, Article Meccanica ; Volume 51, Issue 5 , 2016 , Pages 1113-1125 ; 00256455 (ISSN) ; Firouz Abadi, R. D ; Sharif University of Technology
Springer Netherlands
2016
Abstract
The present study aims at the investigation of free vibration analysis of thin cylindrical shells surrounded by an elastic medium, which is distributed over a particular length of the shell. The Love’s shell theory is utilized along with the Winkler foundation to obtain the governing equations of motion. An exact series expansion method of solution is employed for any arbitrary boundary conditions. The excellent accuracy of the obtained results is validated by comparing to the available literature. Moreover, several case studies are performed to provide an insight into the influence of some practically important parameters on free vibrations of circular cylindrical shells, including...
Sloshing effects on supersonic flutter characteristics of a circular cylindrical shell partially filled with liquid
, Article International Journal for Numerical Methods in Engineering ; 2018 ; 00295981 (ISSN) ; Ovesy, H. R ; Dehghani Firouz Abadi, R ; Sharif University of Technology
John Wiley and Sons Ltd
2018
Abstract
This paper aims to revisit the effect of sloshing on the flutter characteristics of a partially liquid-filled cylinder. A computational fluid-structure interaction model within the framework of the finite element method is developed to capture fluid-structure interactions arising from the sloshing of the internal fluid and the flexibility of its containing structure exposed to an external supersonic airflow. The internal liquid sloshing is represented by a more sophisticated model, referred to as the liquid sloshing model, and the shell structure is modeled by Sanders' shell theory. The aerodynamic pressure loading is approximated by the first-order piston theory. The initial geometric...
Sloshing effects on supersonic flutter characteristics of a circular cylindrical shell partially filled with liquid
, Article International Journal for Numerical Methods in Engineering ; Volume 117, Issue 8 , 2019 , Pages 901-925 ; 00295981 (ISSN) ; Ovesy, H. R ; Firouz Abadi, R. D ; Sharif University of Technology
John Wiley and Sons Ltd
2019
Abstract
This paper aims to revisit the effect of sloshing on the flutter characteristics of a partially liquid-filled cylinder. A computational fluid-structure interaction model within the framework of the finite element method is developed to capture fluid-structure interactions arising from the sloshing of the internal fluid and the flexibility of its containing structure exposed to an external supersonic airflow. The internal liquid sloshing is represented by a more sophisticated model, referred to as the liquid sloshing model, and the shell structure is modeled by Sanders' shell theory. The aerodynamic pressure loading is approximated by the first-order piston theory. The initial geometric...