Scheduled and unscheduled maintenance actions are a significant cost for gas turbines. Advanced life prediction capabilities help to mitigate these costs. However, the protective thermal and damping coatings applied to the turbine rotors which can help significantly extend component life simultaneously increase the difficulty of modeling the behavior of the components due to the nonlinearity they introduce. The purpose of this research is to expand finite element modeling and analysis of coated turbine blades and blisks such that it incorporates a nonlinear constitutive law for coatings and to solve the improved model for the frequency response using the harmonic balance method. The improved model can be used to both optimize the coating used within the operating conditions of the turbine and improve life prediction capabilities of the system.
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