Simulation of the effect of sub- micron interface roughness on the stress distribution in functionally graded thermal barrier coatings (FG- TBC)
محل انتشار: مجله سرامیک های پیشرفته، دوره: 1، شماره: 1
سال انتشار: 1394
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 155
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شناسه ملی سند علمی:
JR_ACERPT-1-1_008
تاریخ نمایه سازی: 11 اردیبهشت 1400
چکیده مقاله:
In this research, a numerical modeling was utilized to calculate the stresses caused during 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 thermal cycle and interface morphology of the ceramic / metallic layer in functionally graded coating system was investigated. Sinusoidal mode of asperity with specific wavelength and amplitude was considered to model the two dimensional geometry of interface profile between layers. A finite element model (FEM) was used to model the effect of thermal loading imposing on the thermo- mechanical response and stress distribution of FG- TBC. In this regard, different observable facts are 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 at the system and the subsequent delamination places of the TBCs system were predicted.
کلیدواژه ها:
Finite element method ، Functionally graded thermal barrier coating ، sinusoidal interface ، Residual Stress
نویسندگان
Nasim Nayebpashaee
Material Engineering, Iran University of Science and Technology (IUS
M.R. Aboutalebi
Material Engineering, Iran University of Science and Technology (IUS
Seyed Hossein Seyedein
Material Engineering, Iran University of Science and Technology (IUS
H. Sarpoolaky
Material Engineering, Iran University of Science and Technology (IUS
Mohammad Mehdi Hadavi
Materials, Malek Ashtar University of Technology