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Buckling Analysis of Reinforced Composite Conical Shells under Axial Compressive Load using GDQ Method

Gholami, Peyman | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49971 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kouchakzadeh, Mohammad Ali; Shakouri, Meysam; Noghabi, Mohammad
  7. Abstract:
  8. The object of this study is to determine the buckling load of reinforced composite conical shells under axial compression. . Shells are reinforced by stringers and rings and the boundary conditions are assumed to be simply supported. At first the equilibrium equations are obtained using the first order shear deformation theory (FSDT), smeared stiffener technique and principle of minimum potential energy. In the following, the resulting equations which are the system of five variable coefficient partial differential equations in terms of displacement components are investigated by generalized differential quadrature method (GDQM). Finally the standard eigenvalue equation is formed and the critical buckling load is calculated. To be sure about the accuracy of the results obtained by the GDQ method, comparisons are made with the results of FEM method and other researcher's results available in the literature. Very good agreements are achieved. The influence of various parameters such as the number of stiffeners and rings, dimensional parameters and semi-vertex angle of the cone on the buckling behavior of the shell are investigated. At the end, optimum number of stiffener to achieve the maximum buckling load in composite conical shell for a specific weight is investigated. In the present work, smearing approach is adopted. Therefore, only global buckling behavior is considered
  9. Keywords:
  10. Buckling ; Critical Buckling Load ; Generalized Diffrential Quadrature ; First-Order Shear Deformation Theory ; Shells Buckling ; Conical Shell

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