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Micromechanical fem modeling of thermal stresses in functionally graded materials

Akbarpour, S ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: 2008
  3. Abstract:
  4. The most common use of FG materials is as barrier coating against large thermal gradients. Thermal stresses in FG materials, if not released, may cause structural discontinuities in outer surfaces or even inside the material such as cracks, debonding, etc. In this research work, using Finite element method and micromechanical modeling of FG thermal barrier coatings, stresses under thermal and mechanical loadings of the same and different phases have been investigated. Also, the effect of some parameters such as refinement and offsetting of particles on stresses are studied. As for the loading, thermal cycle and in-phase and out-of-phase thermo-mechanical cyclic loadings are considered. The material is assumed to be CoCrAlY/Zro2 where the volume fraction of Zro2 in CoCrAlY is assumed to vary linearly through the thickness. With applying appropriate boundary conditions, the stress state in X-dir at different time steps are found
  5. Keywords:
  6. Barrier coatings ; CoCrAlY/Zro2 ; Different time steps ; Functionally graded material (FGM) ; Micro-mechanical modeling ; Structural discontinuity ; Thermal and mechanical loadings ; Thermo-mechanical ; Aerodynamics ; Beams and girders ; Composite micromechanics ; Finite element method ; Thermal barrier coatings ; Thermal stress ; Functionally graded materials
  7. Source: 26th Congress of International Council of the Aeronautical Sciences 2008, ICAS 2008, Anchorage, AK, 14 September 2008 through 19 September 2008 ; Volume 2 , January , 2008 , Pages 2851-2859 ; 9781605607153 (ISBN)
  8. URL: http://www.icas.org/ICAS_ARCHIVE/ICAS2008/ABSTRACTS/480.HTM