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Buckling Analysis of Composite Truncate Conical Sandwich Panel with Flexible Core under Axial Load and Hydrostatic Pressure

Mehri, Mohsen | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47052 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kouchakzadeh, Mohammad Ali
  7. Abstract:
  8. In the present study, the buckling of conical sandwich panel with composite faces and flexible core is investigated. At first, the nonlinear differential equations based on Donnell and Novozhilov theories with relevant boundary conditions for conical shells are derived using energy method and Hamilton principle. In the following, by applying adjacent-equilibrium criterion, the equations are linearized and the equations of conical shell are obtained. Then, the results obtained from these theories are compared, and based on the benefits and application domain of the theories, Novozhilov theory is selected to model composite faces of the sandwich panel. High-order sandwich theory is used for modeling of the core. Conical sandwich panel under axial and lateral loads with clamped and simply supported boundary conditions are analyzed after modeling of faces and core and applying compatibility conditions at the interface. Generalized differential quadrature method is used to solve the governing equations. The critical buckling loads that are obtained from this investigation are compared with another articles in different geometry and different material for validation such as the isotropic conical shell, composite conical shell and isotropic conical sandwich panel. The results are consistent with the results available in the literature. Finally, the effect of various factors such as ratio of length to radius, ratio of core’s thickness to total thickness, number of layers in faces, ratio of core elasticity module to faces elasticity module, half apex angle of the cone, boundary conditions, loads and ratio of radius to total thickness are studied. Increasing the ratio of length to radius, half apex angle of cone and ratio of radius to total thickness, buckling load is decreased. Also the buckling load of clamped boundary conditions is higher than the buckling load of simply supported cases. With increasing ratio of core thickness to total thickness and ratio of core elasticity module to faces elasticity module, buckling load is increased
  9. Keywords:
  10. Buckling ; Conical Sandwich Panel ; Flexible Core ; Generalized Diffrential Quadrature ; Hydrostatic Pressure ; Novozhilov Theory

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