Reliable prognostic of thermal barrier coating systems (TBCs) as applied to hot section engine components is a challenging task. Physics based approach is made here involving both experimental physical damage signature analysis and thermal cycle simulations. Thermally grown oxides (TGO) and the developing cracks in TBCs increase with thermal exposures. An exponential relationship is observed between the two parameters. Significant variations in size and characteristics of the damage signatures are observed depending on the four typical cycle profiles considered. In this paper, fourth order Runge-Kutta method is used for the numerical analysis of the differential equation for TGO growth analysis. Damage tolerance approach considering fracture mechanics based stress intensity factor is used to determine the crack tolerance level and remaining useful life. Our earlier fracture mechanical model for composite TBCs is modified assuming the crack to nucleate and grow within the TBC and not inside TGO. An overview of the PHM solution is presented.
How to Cite
remaining life, Thermal barrier coating, oxide growth, crack size, damage tolerance, thermal cycle similation
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