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- W4289351681 abstract "<p indent=0mm>Thermal barrier coatings (TBCs) may gradually degrade from severe thermal environments, eventually leading to spallation and failure during thermal cyclic loading. Atmospheric-plasma-sprayed (APS) TBC was used as the research object in this study. By combining the crack growth model of the subcritical stage, the exponential model of the critical energy release rate, and the improved growth model of the thermally grown oxide (TGO) layer, a life prediction model was derived. The accuracy of the life prediction model proposed in this study was verified by comparing it with the published experimental data. Then, the life prediction model was applied to analyze the performance of TBCs used as thermal protection for the guide vane of a certain type of gas turbine in China. Results showed that with the thickening of the TGO layer, stress inversion occurs at the TBC/BC interface when the critical thickness is reached. The tensile stress at the TBC/TGO interface can induce nearby crack propagation. At this time, further thickening of the TGO will accelerate crack propagation until the crack grows and reaches a critical size and the TBC fails. The time to failure of the TBC decreases exponentially with the serving temperature, and increasing the TBC/TGO interface roughness can effectively extend the service life of the TBC. The model presented in this study has a good application value for the life prediction of the APS TBC." @default.
- W4289351681 created "2022-08-02" @default.
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- W4289351681 date "2023-02-01" @default.
- W4289351681 modified "2023-10-17" @default.
- W4289351681 title "A life prediction model of thermal barrier coatings on turbine blades based on crack propagation" @default.
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- W4289351681 doi "https://doi.org/10.1360/sst-2022-0142" @default.
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