Uncertainty quantification of the lifetime of self-healing thermal barrier coatings based on surrogate modelling of thermal cyclic fracture and healing

Kumthekar, Anuj; Ponnusami, Sathiskumar A.; Zwaag, Sybrand der; Turteltaub, Sergio

doi:10.1016/j.matdes.2022.110973

Cited by 3 publications

(2 citation statements)

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“…In Figure 6a, the red high-temperature areas on the surface of the TBCs in the static state are mainly distributed in positions 1 ⃝ directly in front of and 3 ⃝ directly behind the thermal shock of the gas. The temperature at positions 2 ⃝ and 4 ⃝ decreases sequentially from top to bottom, and the cooling effect is obvious. At the same time, the same result can be obtained from the flow field temperature distribution of the TBC section in Figure 7a.…”

Section: Temperature Field Of Eb-pvd Tbcsmentioning

confidence: 96%

“…The aeroengine serves as the core of an aircraft, with the thrust-to-weight ratio being a pivotal parameter for the engine. In recent years, the engine's gas inlet temperature has risen due to an increase in the thrust-to-weight ratio, reaching 1900 K in advanced turbofan engines [1][2][3]. Single-crystal materials and high-efficiency cooling air film technology are no longer sufficient for the demands of advanced hot-end engine components.…”

Section: Introductionmentioning

confidence: 99%

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Reliability Evaluation of EB-PVD Thermal Barrier Coatings in High-Speed Rotation and Gas Thermal Shock

Yan,

Li,

Liu

et al. 2024

Coatings

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The uncertain service life of thermal barrier coatings (TBCs) imposes constraints on their secure application. In addressing this uncertainty, this study employs the Monte Carlo simulation method for reliability evaluation, quantifying the risk of TBC peeling. For reliability evaluation, the failure mode needs to be studied to determine failure criteria. The failure mode of high-speed rotating TBCs under gas thermal shock was studied by combining fluid dynamics simulations and experiments. Based on the main failure mode, the corresponding failure criterion was established using the energy release rate, and its limit state equation was derived. After considering the dispersion of parameters, the reliability of TBCs was quantitatively evaluated using failure probability and sensitivity analysis methods. The results show that the main mode is the fracture of the ceramic layer itself, exhibiting a distinctive top-down “step-like” thinning and peeling morphology. The centrifugal force emerges as the main driving force for this failure mode. The failure probability value on the top side of the blade is higher, signifying that coating failure is more likely at this location, aligning with the experimental findings. The key parameters influencing the reliability of TBCs are rotation speed, temperature, and the thermal expansion coefficient. This study offers a valuable strategy for the secure and reliable application of TBCs on aeroengine turbine blades.

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Section: Temperature Field Of Eb-pvd Tbcsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%