Finite element simulation of stress distribution through novel duplex thermal barrier coating used in turbine engine

Thermal barrier coatings (TBCs) have become an important element in hot section component durability. An attempt was made to investigate the thermal and residual stress distribution in a novel three layer (8YSZ/ La2Zr2O7/NiCrAlY) during a real-like heating regime which includes heating, service time and final cooling. Finite element approach with considering temperature dependency and also hybrid meshing was Heat flux and nodal temperature contours indicated that, most of damaging and harmful thermal load and residual stress concentrate on ceramic top coats and this lead less harm and life time reduction in substrate.