Both the TGO and bond coat material are perfectly plastic, and the yield stress of the TGO is temperature-dependent.
| Young’s Modulus (MPa) | Poisson’s Ratio |
Yield Stress (MPa) | Thermal Expansion Coefficient(/˚C) | |
|---|---|---|---|---|
| Bond Coat | 190 | 0.3 | 200 | 9.33 × 10e-6 |
| TGO | 380 | 0.2 |
10,000 (T ≤ 900°C)
1000 (T = 1000°C) |
5.33 × 10e-6 |
To prevent overconstraint in the out-of-plane direction, and due to the plane strain assumption, the thermal expansion coefficients are set to zero in the thickness direction. The thermal expansion coefficients in the model are therefore defined as:
tb,cte,1 ! TGO tbdata,1,5.33e-6,5.33e-6,0 tb,cte,2 ! Bond coat tbdata,1,9.33e-6,9.33e-6,0