Title of article :
Simulation of the effect of material properties and interface roughness on the stress distribution in thermal barrier coatings using finite element method
Author/Authors :
M. Ranjbar-Far، نويسنده , , J. Absi، نويسنده , , G. Mariaux، نويسنده , , F. Dubois، نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2010
Pages :
10
From page :
772
To page :
781
Abstract :
A Finite Element Model (FEM) was developed to evaluate the stresses induced by the thermal cycling in a typical plasma-sprayed thermal barrier coating system (TBCs). The thermo-mechanical model of this multi-layer system takes into account the effects of thermal and mechanical properties, morphology of the top-coat/bond-coat interface and oxidation on the local stresses that are responsible for the micro-crack nucleation during cooling, especially near the metal/ceramic interface. Two top-coat/bond-coat geometries corresponding to different interfacial asperity morphologies (semicircle or sinusoidal) are modeled considering a two dimensional and periodic geometry. The effect of the geometry and the amplitude of asperities on stress distribution are examined to study the cause of the subsequent delamination of the TBCs system. Moreover, the effect of the creep in all layers and plastic deformation in the bond-coat as well as the oxidation in the perpendicular direction of the top-coat/bond-coat interface are examined toward the stress development and critical sites with respect to possible crack paths. In addition, crack initiation and propagation at the system was predicted.
Keywords :
Finite element analysis , Thermal barrier coatings , Oxidation , Thermo-mechanical behaviour , Thermal cycle
Journal title :
Materials and Design
Serial Year :
2010
Journal title :
Materials and Design
Record number :
1068666
Link To Document :
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