Loading...
Search for:
generally-lamination
0.009 seconds
Analytical Approach for Buckling Analysis of Generally Laminated Conical Shells under Axial Compression
, M.Sc. Thesis Sharif University of Technology ; Kouchakzadeh, Mohammad Ali (Supervisor)
Abstract
In this thesis, buckling of truncated conical shells made of composite laminates with general lamination sequence is investigated. The conical shell is considered under axial compression with simply supported or clamped boundary condition. First, Donnel type nonlinear equations and boundary conditions for doubly curved shells are obtained using Hamilton principle. Second, using adjacent equilibrium criterion, the nonlinear equations was linearized then with defining lame parameters and curvature radius, the linear equations of conical shell was extracted. The power series and Galerkin method was used to solve differential equations. The obtained results are in good agreement with available...
Torsional buckling of generally laminated conical shell
, Article Meccanica ; Volume 52, Issue 4-5 , 2017 , Pages 1051-1061 ; 00256455 (ISSN) ; Sharghi, H ; Kouchakzadeh, M. A ; Sharif University of Technology
Springer Netherlands
2017
Abstract
Buckling of generally laminated conical shells under uniform torsion with simply-supported boundary conditions is investigated. The Donnel type strain displacement relations are used to obtain potential strain energy of the shell and membrane stability equation is applied to acquire the external work done by torsion. The Ritz method is used to solve the governing equations and critical buckling loads are obtained. The accuracy of the results is validated in comparison of with other investigations and finite element method. The effects of lamination sequence, semi-vertex angle and length to radius ratio of the cone are evaluated and mode shapes are presented for two types of lamination...
Stability analysis of generally laminated conical shells with variable thickness under axial compression
, Article Mechanics of Advanced Materials and Structures ; 2018 ; 15376494 (ISSN) ; Kouchakzadeh, M. A ; Shakouri, M ; Sharif University of Technology
Taylor and Francis Inc
2018
Abstract
The buckling of generally laminated conical shells having thickness variations under axial compression is investigated. This problem usually arises in the filament wound conical shells where the thickness changes through the length of the cone. The thickness may be assumed to change linearly through the length of the cone. The fundamental relations for a conical shell with variable thickness applying thin-walled shallow shell theory of Donnell-type and theorem of minimum potential energy have been derived. Nonlinear terms of Donnell equations are linearized by the use of adjacent-equilibrium criterion. Governing equations are solved using power series method. This procedure enables us to...
Stability analysis of generally laminated conical shells with variable thickness under axial compression
, Article Mechanics of Advanced Materials and Structures ; Volume 27, Issue 16 , 2020 , Pages 1373-1386 ; Kouchakzadeh, M. A ; Shakouri, M ; Sharif University of Technology
Taylor and Francis Inc
2020
Abstract
The buckling of generally laminated conical shells having thickness variations under axial compression is investigated. This problem usually arises in the filament wound conical shells where the thickness changes through the length of the cone. The thickness may be assumed to change linearly through the length of the cone. The fundamental relations for a conical shell with variable thickness applying thin-walled shallow shell theory of Donnell-type and theorem of minimum potential energy have been derived. Nonlinear terms of Donnell equations are linearized by the use of adjacent-equilibrium criterion. Governing equations are solved using power series method. This procedure enables us to...
Hygrothermal Stress Analysis in Composite Laminatesby Perturbation Method
, M.Sc. Thesis Sharif University of Technology ; Nosier, Asghar (Supervisor)
Abstract
For studying the hygrothermal deformation of generally laminated composite platesunder uniform temperature change and uniform moisture absorption change, by starting from the reduced form of elasticity displacement field for a long flat laminate, an analytical method is developed in order to accurately calculate the interlaminar stresses near the free edges of the laminate. The constant parameters appearing in the reduced displacement field, describe the global deformation of the laminate and appropriately obtained by employing an improved first-order shear deformation theory.For solving the coupled equilibrium equations of agenerally laminated composite plate, some of the stiffness...
An analytical approach for the free vibration analysis of generally laminated composite beams with shear effect and rotary inertia
, Article International Journal of Mechanical Sciences ; Volume 65, Issue 1 , December , 2012 , Pages 97-104 ; 00207403 (ISSN) ; Abedi, M ; Kargarnovin, M. H ; Ahmadian, M. T ; Sharif University of Technology
2012
Abstract
In this paper, the free vibration analysis of generally laminated composite beam (LCB) based on Timoshenko beam theory are presented using the method of Lagrange multipliers where in the free vibration problem is posed as a constrained variational problem. The effect of material couplings (bending-tension, bending-twist, and tension-twist couplings) with the effects of shear deformation, rotary inertia and Poisson's effect are taken into account. Analytical expression for the natural frequencies and mode shapes are presented. The calculated natural frequencies are verified against some available results in the literature and very good agreement is observed. Furthermore, the effects of some...
Dynamics of a generally layered composite beam with single delamination based on the shear deformation theory
, Article Science and Engineering of Composite Materials ; Volume 22, Issue 1 , 2015 , Pages 57-70 ; 0334181X (ISSN) ; Abedi, M ; Kargarnovin, M. H ; Ahmadian, M. T ; Sharif University of Technology
Walter de Gruyter GmbH
2015
Abstract
The free vibration analysis of generally laminated composite beam (LCB) with a delamination is presented using the finite element method (FEM). The effect of material couplings (bending-tension, bending-twist, and tension-twist couplings) with the effects of shear deformation, rotary inertia, and Poisson's effect are taken into account. To verify the validity and the accuracy of this study, the numerical solutions are presented and compared with the results from available references and very good agreement observed. Furthermore, the effects of some parameters such as slenderness ratio, the rotary inertia, the shear deformation, material anisotropy, ply configuration, and delamination...