Numerical Simulation For Oxidation Process Of TBCs At High Temperature Based On ABAQUS User Subroutine

Rapid development of industrial gas turbine technology leads to a severer loadingcondition for the metallic components via the continuous increase of turbine inlettemperature. Hence, thermal barrier coatings (TBCs) are widely used in these devices toprovide thermal protection. Current studies show that, the fatigue performance of thermalbarrier coating strongly associated with mechanical property of TGO. During oxidation athigh temperature, the process of TGO formation has a direct impact on the strain of itself,and on the yield and creep of mechanical properties in Bond Coat. Simultaneously, hugehot stresses was generated in the growth process of TGO, which had a seriously influenceon the fatigue of thermal barrier coating system.This study focuses on the implementation procedure of the material properties inBond Coat or Substrate change to which in TGO. Based on the ABAQUS powerful abilityof extensible user programming, using part of user subroutines in ABAQUS software, thegrowth process of TGO was analyzed by numerical simulation in which parameters ofFEM model consistent yield strength of TGO and Bond Coat at high temperature comefrom in-house experiment. Meanwhile, for using the model in analysis of TGO crack,following the finite element method, a crack model which contains the COD principle wasbuilt.The comparison between simulation results and the previous shows that these resultsare in a rather good consistency which indicates the study presented in paper is correct andeffective. The results of crack simulation and in-house experiment provide an effectivepredicting of stress concentration region in essential spot, and solid foundation for theusing and development of this model.