Simulation of residual stresses and their effects on thermal barrier coating systems using finite element method

2014 ◽  
Vol 58 (3) ◽  
pp. 1-10 ◽  
Author(s):  
JianGuo Zhu ◽  
Wei Chen ◽  
HuiMin Xie
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Residual Stresses ◽  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Element Method

Effect of Interlayer on the Residual Stresses within High-Temperature Coating

2006 ◽  
Vol 514-516 ◽  
pp. 1318-1322
Author(s):  
Xian Cheng Zhang ◽  
Bin Shi Xu ◽  
Hai Dou Wang ◽  
Yi Xiong Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
High Temperature ◽  
Residual Stresses ◽  
Thermal Cycling ◽  
Physical Meaning ◽  
Thermal Barrier ◽  
The Finite Element Method ◽  
Material Combination ◽  
Barrier Coating

The effect of NiCoCrAlYx-ZrO2 (1-x) interlayer on the residual stresses in the ZrO2/NiCoCrAlY thermal barrier coating due to thermal cycling was analyzed using the finite element method. Modeling results showed that the magnitude and distribution of the residual stresses in the coating were strongly influenced by the material combination characterized by the value of x and the thickness of interlayer. The maximum tensile stresses at the different regions (i.e. coating/substrate interface, coating surface, et al.) as functions of the material combination and the thickness of the interlayer were obtained. The physical meaning of the above results was also discussed.

Analysis of the Stress State in Thermal Barrier Coatings during a Thermal Cycle

1996 ◽  
Author(s):  
G. Jönsson ◽  
C. Persson
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress State ◽  
Residual Stresses ◽  
Thermal Barrier Coatings ◽  
Thermal Cycle ◽  
Thermal Stresses ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Element Method

Abstract Thermal barriers made up by a ceramic top coating and a metallic bond coating are subjected to thermal cycles in service. The thermal stresses vary during the cycles and the residual stresses change as a result of plastic flow and creep. The stress state in thermal barrier coatings during a thermal cycle has been examined with a finite element method using temperature dependent material data. The calculated results were verified by measurements of the residual stresses with the layer removal technique before and after cycling of specimens heated in furnace with air environment. According to the simulation of a thermal cycle to 700 ° C, using a finite element method, the bond coat is approximately stress free after 1 hour dwell time. Thus, the residual stresses after a thermal cycle is a result of thermal expansion mismatch and temperature drop.

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