Interfacial damage mechanical characterization and evolution model of EB-PVD thermal barrier coatings based on 3D-DIC technology

Abstract Thermal barrier coatings (TBCs), owing to their excellent properties, are widely used in aero-engines to enhance efficiency and extend lifespan. In this paper, a novel uniaxial compression-based mechanical characterization model for TBCs interface damage was proposed, which is applicable to a range of buckling modes. Furthermore, with the aid of threedimensional digital image correlation (3D-DIC) technology, the exfoliation criterion of TBCs in room temperature compression tests was determined, and damage quantification was achieved in conjunction with the damage characterization model. The results indicate that total damage consists of oxidative, cyclic, and sintering damages, and respective damage evolution models were established. Finally, the total interface damage evolution model of TBCs was constructed based on the principle of nonlinear accumulation of damage The results demonstrate that the error between the measured and calculated damage values is less than ±10%, indicating high accuracy.