13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- Therefore, when the pre-existing crack is introduced within TC, the crack in the direction which is perpendicular to the flat interface is the optimal choice for preventing the large instability. Figure 6. Normalized 1R and 2R vs. normalized crack length (L/Lmax). Figure 7. Normalized 1R and 2R vs. the crack angle ( ). 5. conclusions The effect of pre-existing microcrack within TC on the displacement instability of TGO in thermal barrier systems is studied by a finite element model with the thermal growth behavior of TGO layer.
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