Simulation of the Effect of Sub-Micron Interface Roughness on the Stress Distribution in Functionally Graded Thermal Barrier Coatings

Authors

1 Department of Materials and metallurgical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran

2 Metallic materials research center, Malek Ashtar University of Technology, Tehran, Iran

Abstract

In this research, a numerical modeling method was utilized to calculate the stresses occurring during 
the thermal cycling in a functionally graded thermal barrier coating (FG - TBC). The temperature –dependent material response of this protective material was taken into account and the effects of the thermal cycle and interface morphology of the ceramic /metallic layer in a functionally graded coating system was investigated. Sinusoidal mode of asperity with specific wavelength and amplitude was used to model the two dimensional geometry of interface profile between layers. A finite element model was used to model the effect of the thermal loading imposed on the thermo-mechanical response and stress distribution. In this regard, different observable facts were taken into account in the model such as: non- homogenous temperature distribution, periodic boundary condition and convective heat transfer.  These phenomena depict the most real world situation in numerical simulation of multi-layer coating during cooling and thermal cycling, specifically near the ceramic/metal interface. In addition, regions which are potent to crack initiation and propagation in the system and the subsequent delamination places of the TBCs system were predicted. 

Keywords

Main Subjects

Open Access

This is an open access article under the CC BY license (https://creativecommons.org/licenses/by/4.0/).

References

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