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Static and Dynamic Postbuckling of Stiffened Laminated Composite Conical Shell

Bohlooly Fotovat, Mehdi | 2021

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 53788 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kouchakzadeh, Mohammad Ali; Mirzavand Boroujeni, Babak
  7. Abstract:
  8. In this dissertation, the buckling and postbuckling analysis of lattice conical shells are presented. The outer skins of the shell may be reinforced by cross-ply laminated composites. The shell is subjected to uniform axial compression and the boundary conditions are simply supported. This problem is solved using two different approaches. At first approach, the main priority is high speed calculations, which is investigated in static and dynamic types of loadings. In the case of static loads, the equilibrium equations are formulated based on the classical theory and von Karman type of nonlinearity. The equations are solved by Galerkin method and a closed-form relation is derived. In the case of dynamic loads, the equations of motion are formulated based on the classical shell theory and applying the Hamilton principle. The solution is based on Galerkin and Runge-Kutta methods. The beneficial point of this approach is that it lets us carry out a parametric analysis with a wide range of parameters. At second approach, the problem is solved with consideration of high accuracy. A solid-shell element is developed for 3D analysis through sampling surfaces technique. The incremental equilibrium equations are solved by the Newton-Raphson method in combination with the Crisfield arc-length algorithm. It can be useful for the 3D stress analysis of thin and thick shell structures in every state of equilibrium path involving prebuckling, buckling and/or postbuckling regime
  9. Keywords:
  10. Cone ; Finite Element Method ; Dynamic Analysis ; Composite Materials ; Buckling ; Laminated Composite Materials ; Lattice Materials ; Laminated Conical Shell ; Postbuckling

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