Numerical study on the thermo-stress of ZrO2 thermal and barrier coatings by high-intensity pulsed ion beam irradiation

This paper studies numerically the thermo-mechanicaleffects of ZrO₂ thermal barrier coatings (TBCs) irradiated bya high-intensity pulsed ion beam in consideration of the surfacestructure. Taking the deposited energy of ion beams in TBCs as thesource term in the thermal conduction equation, the distribution oftemperature in TBCs was simulated. Then, based on thedistribution, the evolution of thermal stress was calculated by thefinite element method. The results show that tensile radial stressformed at the valley of TBC surfaces after irradiation by HIPIB.Therefore, if cracks happen, they must be at valleys instead ofpeaks. As for the stress waves, no matter whether through peak or valleyposition, tensile and compressive stresses are present alternatelyinside TBCs along the depth direction, and the strength of stressdecreases with time.