Tailoring Periodic Vertical Cracks in Thermal Barrier Coatings Enabling High Strain Tolerance

Lifetime is a basic support for the thermal insulation function of barrier coatings (TBCs). Therefore, extending life span essential to develop next-generation TBCs. For this objective, columnar structure formed by vertical cracks appears make sense. However, underlying mechanism still unclear. This work scrutinizes influence periodic on cracking behavior in order tailor high strain tolerant A finite element model was evolved explore crack influenced mismatch between substrate and coating. The virtual closure technique (VCCT) used describe propagation under load. It found clearly that space two (short SVC) along in-plane direction has noteworthy tolerance Results indicate energy release rate (SERR) stresses at pre-crack tip increase continuously with SVC, suggesting driving force increasing. not propagated when SVC very small, whereas grows SVC. growth can be prevented reducing critical value found. When less than value, SERR dramatically reduced. Thus, tailored obtain TBCs tolerance.