Development and application of a microstructure level FEM simulation tool for thermal barrier coatings.

摘要

Further advancements in Thermal Barrier Coating (TBC) design are linked with the evolution of their numerical models. Various simulation approaches, primarily based of finite element method (FEM), have been developed to study the thermo-mechanical behavior of TBCs and their failure.; In the present dissertation the idea of a microstructure level simulation is exploited to analyze effective thermal and mechanical properties of a novel TBC. Moreover, the approach of extended FEM (XFEM) is incorporated in an in-house developed program to account for the presence of cracks in the TBCs; both for stress-strain analysis and for heat transfer analysis. The new XFEM program is then employed to carry out the analyses of coatings with crack structures. Effective Young's moduli, overall thermal conductivities, and fracture behavior of the coatings are predicted and correlated with experimental observations.