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Parametric Analysis of Thermomechanical Stresses in Functionally Graded Materials Under in-phase and out-of-phase Loading

Torabi Aliabadi, Amin | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41200 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. Using Functionally Graded Materials (FGMs) in hot sections of aged aircrafts is one of the most important ways for life extending of Thermal Barrier Coatings (TBCs). Sudden variation of thermal stresses in interface of bond coat and ceramic coat layers could be changed to gradual variation with use of FGMs. The stress in FGMs has been the subject of several researches. Both macro and micromechanical modeling approaches have been used in these studies. In the macro mechanical approach, FGM is modeled as a multi-layer composite in which mechanical properties of each layer is found by averaging the properties and volume fraction of FGM constituents through the thickness of the layer. In this approach, each layer is modeled as a composite. There are several models which relate mechanical properties of two constituent composite, to volume fraction and mechanical properties of each constituent. In micromechanical approach FGM is modeled by placement of the rectangular grains of constituents in special arrangements. In these studies longitudinal arrangement of grains (number of each constituent’s grains in each layer) is found by averaging the volume fraction of constituents in each layer
  9. Keywords:
  10. Thermal Stress ; Functionally Graded Materials (FGM) ; Parametric Analysis ; Micromechanical Model ; Mechanical Stress ; MICROMECHANICAL MODEL ; In-Phase Loading ; Out-of-Phase Loading

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