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Aeroelasticiy of Supersonic Wing Made of Functionally Graded Materials Using Finite Element Method

Razie, Hamed | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39369 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan
  7. Abstract:
  8. The aeroelastic behavior of wings made of functionally graded materials in supersonic flow is studied. For this purpose the flutter speed is calculated and in the next step the post flutter behavior is investigated. The structural model is based on the classical plate theory and material properties are assumed to be graded in the thickness direction according the power law distribution in terms of the volume fraction of material constituents. The linear piston theory which is modified to include thickness effects is used for supersonic aerodynamic modeling. The nonlinear structural model based on the Von-Karman strains is considered for prediction of the post-flutter behavior of the wing. The governing equations of motion are obtained using Hamilton’s principle and the four node compatible BFS element is employed for finite element modeling of the problem. The K-method is used for stability analysis of the linear form of aeroelastic equations. The calculated flutter speed and frequency are compared with available results which shows good agreement. The effects of thickness ratio and volume fraction on stability boundaries, are studied. The studies show that LCO is occurred at post flutter situation
  9. Keywords:
  10. Finite Element Method ; Unsteady Aerodynamic ; Aeroelasticity ; Functionally Graded Materials (FGM) ; Flutter

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