Finite element simulation of stress distribition through novel duplex thermal barrier coatingused in turbofan internal combustion engine

An attempt was made to investigate the thermal andresidual stress distribution in a novel three layer(La۲Zr۲O۷/ ۸YSZ/ NiCrAlY) during a real-like heatingregime which includes heating, service time and finalcooling. For achieving maximum accuracy andconsistency in calculation of thermal and mechanicalproperties of hybrid coating system, all related andrequired properties were introduced to the software intemperature- dependent mode. Element modificationapproaches like mass scaling leads to a considerablereduction in running time while satisfying and notviolating accuracy and converging criteria andconstrains. Applying adaptive hybrid meshingtechniques which applies both mesh – part dependencyand independency during numerical iterative solutionavoids element distortion and diverging in coupledproblem. Heat flux and nodal temperature contoursindicated that, most of damaging and harmful thermalload and residual stress concentrate on ceramic top coatsand this lead less harm and life time reduction insubstrate.