%0 Journal Article %T Simulation of the Effect of Sub-Micron Interface Roughness on the Stress Distribution in Functionally Graded Thermal Barrier Coatings %J Advanced Ceramics Progress %I Materials and Energy Research Center (MERC) Iranian Ceramic Society (ICERS) %Z 2423-7477 %A Nayebpashaee, Nasim %A Seyedein, Seyed Hossein %A Aboutalebi, M.R. %A Sarpoolaky, H. %A Hadavi, Mohammad Mehdi %D 2015 %\ 03/01/2015 %V 1 %N 1 %P 40-47 %! Simulation of the Effect of Sub-Micron Interface Roughness on the Stress Distribution in Functionally Graded Thermal Barrier Coatings %K Finite element method %K Functionally graded thermal barrier coating %K sinusoidal interface %K Residual Stress %R 10.30501/acp.2015.69999 %X 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.  %U https://www.acerp.ir/article_69999_6c5f28ece8c8d838b7fac75cd961db6b.pdf