About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
High Temperature Oxidation of Metals and Ceramics
|
Presentation Title |
Failure Behavior Analysis of Thermal Barrier Coatings under Adverse Environment: Analytical and Numerical Modeling |
Author(s) |
Jinrong Yan, Xin Wang, Kuiying Chen |
On-Site Speaker (Planned) |
Kuiying Chen |
Abstract Scope |
Premature failure of thermal barrier coatings (TBCs) is a preliminary phenomenon significantly limiting their applications in gas turbine engines. Delamination of TBCs occurs typically at coating interfaces due to thermal mismatch stress via crack nucleation and propagation. This presentation reports this phenomenon using multi-physics approach. Under high-temperature adverse environment, multiple-factors are coupled to lead to failure through creep, topcoat sintering, oxide growth and interface imperfection. Heat transfer was implemented into TBC model to simulate in-service operation conditions. Periodic model of TBCs was modelled with the phase-field method addressing the fracture-damage evolution of topcoats. The interface degradation was investigated by cohesive zone model. Preliminary results demonstrate that the model well couples the above factors, and topcoat cracks propagate rapidly during an early stage and continue to grow as topcoat is sintered. Using the cohesive zone model at the topcoat, more crack paths are also studied, and the predominated effects were identified. |