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Effect of lateral placement of ceramic and metal grains on thermal stress distribution throughout FGMS

Torabi, A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. Publisher: 2012
  3. Abstract:
  4. The properties of Functionally Graded Materials (FGM) are characterized by gradual variation of volume fraction of their constituents or phases over the thickness direction. They are normally ceramic in one side and metal in the other side. This kind of material has been employed as thermal barrier and also as coatings in many applications including turbine blades. Thermal stress behavior of FGMs is normally studied by simulating the material as a composite laminate where the properties ofeach layer are found by averaging the properties and volume fraction of FGM constituents through the thickness of the layer. However, it should be mentioned that the grains of FGM constituents are usually placed irregularly through the layers and the effect of lateral placement of grains is neglected which may affect the distribution of the stresses. In the present study a finite element micromechanical model is developed to study the effect of lateral placement of grains on thermal stress distribution. Furthermore, theformer approach leads into an average thermal stress through the layer width, while, here the thermal stress is presented in micro size (grain size) level. The obtained results show that the effect of lateral placement of the grains is noticeable when the unit cell width of the FGM is large enough to influence the stress distribution
  5. Keywords:
  6. Composite laminate ; Finite Element ; Micromechanical model ; Stress behavior ; Thermal barrier ; Thickness direction ; Turbine blade ; Aerodynamics ; Ceramic materials ; Functionally graded materials ; Laminated composites ; Stress concentration ; Thermal barrier coatings ; Thermal stress
  7. Source: 28th Congress of the International Council of the Aeronautical Sciences 2012, ICAS 2012 ; Volume 3 , 2012 , Pages 1878-1884 ; 9781622767540 (ISBN)
  8. URL: http://www.icas.org/ICAS_ARCHIVE/ICAS2012/PAPERS/772.PDF