Modeling of residual stresses in a plasma-sprayed zirconia/alumina functionally graded-thermal barrier coating

Widjaja, Sujanto; Limarga, Andi M.; Yip, T.H.

doi:10.1016/s0040-6090(03)00427-9

Cited by 159 publications

(63 citation statements)

References 22 publications

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“…Also plastic deformation properties of materials are shown in Table 2 (Ref 13,15,16,18) where T was the temperature, r y was the yield stress of the top coat, and H was the plasticity coefficient. Bilinear approximation was used in plastic region.…”

Section: Materials Characteristicsmentioning

confidence: 99%

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A Numerical Study on Generation Mechanism of Vertical Cracks in Top Coat of TBCs During APS Deposition

2015

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Clarification of crack generation mechanism in the top coat of the thermal barrier coatings (TBCs) during atmospheric plasma spray process is important to improve the reliability of TBC. In this study, finite element analyses of stress and strain during the deposition process were conducted with layer-bylayer method to understand the cracking behaviors. Stress relaxation by generation of vertical cracks was expressed as an elasto-plastic behavior of the coating. The effects of pre-heating temperature of the substrate and plasma power on crack development were analyzed by changing of the initial and atmospheric temperatures in simulation, respectively. The simulation results of radial strain explained the experimental results of crack monitoring by non-contact laser acoustic emission method.

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Section: Materials Characteristicsmentioning

confidence: 99%

“…Sfar Layer-by-layer method is widely used to simulate deposition processes by thermal spraying (Ref 12,13). In conventional layer-by-layer method, thermal spray process is treated as a sequential deposition of layers of the top coat with a certain thickness.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Generation Mechanism of Vertical Cracks in Top Coat of TBCs During APS Deposition

2015

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“…Prominent among these factors are the TGO growth, rumpling in the bond coat, microstructural changes in the bond coat and ceramic coating. Even sintering of the columns in the ceramic layer over long periods of high temperature exposure (Sujanto Widjaja et al, 2003;Limarga et al, 2002;He et al, 2000) and creep deformation (Hutchinson, 2001) can also lead to changes in stresses in the TBC. The effect of rumpling has been already discussed in our earlier paper (Srivathsa et al, 2011) and the effect of dynamic growth of TGO is currently under study.…”

Section: Stress Variation Over 1000 Thermal Cyclesmentioning

confidence: 99%

Parametric Studies Of Failure Mechanisms In Thermal Barrier Coatings During Thermal Cycling Using FEM

Srivathsa¹,

Das²

2015

International Journal of Applied Mechanics and Engineering

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Thermal barrier coatings (TBCs) are widely used on different hot components of gas turbine engines such as blades and vanes. Although, several mechanisms for the failure of the TBCs have been suggested, it is largely accepted that the durability of these coatings is primarily determined by the residual stresses that are developed during the thermal cycling. In the present study, the residual stress build-up in an electron beam physical vapour deposition (EB-PVD) based TBCs on a coupon during thermal cycling has been studied by varying three parameters such as the cooling rate, TBC thickness and substrate thickness. A two-dimensional thermomechanical generalized plane strain finite element simulations have been performed for thousand cycles. It was observed that these variations change the stress profile significantly and the stress severity factor increases nonlinearly. Overall, the predictions of the model agree with reported experimental results and help in predicting the failure mechanisms.

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“…It normally has four layers including top coating (TC), thermal grown oxide (TGO), bond coating (BC), and substrate (SUB). Differences of material properties, TGO growing at elevated temperature, and harsh environment in serving, are considered as the main reasons for residual stresses and failure [3][4][5][6].Numerical method has been utilized frequently to discuss TBCs stresses based on finite element method. Freborg et al [7] examined the stresses induced by BC oxidation.…”

Section: Introductionmentioning

confidence: 99%

Study on insulation and stresses of TBCs on a turbine vane under ununiform temperature field

Liu¹,

Liu²,

Liu³

2017

Proceedings of the 2017 International Conference on Material Science, Energy and Environmental Engineering (MSEEE 2017)

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Abstract. The paper focuses on insulation and stress of TBCs on a multilayer-coated blade considering ununiform temperature field. First the ununiform temperature field of TBCs was conducted by thermal-flow couple method. Then the thermal cycle residual stresses were modeled by holding the uniform temperature in the dwell step. It is found that the blade benefited more in substrate average temperature than the maximum temperature with top coating (TC) thickening, but the thickness of TC can only slightly affect the temperature fluctuation on TBCs surface. However, thickening TC produced higher normal stresses near the interface around the blade. It suggests that TBCs may suffers delamination near the interface due to residual stresses with TC thickening.

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Modeling of residual stresses in a plasma-sprayed zirconia/alumina functionally graded-thermal barrier coating

Cited by 159 publications

References 22 publications

A Numerical Study on Generation Mechanism of Vertical Cracks in Top Coat of TBCs During APS Deposition

A Numerical Study on Generation Mechanism of Vertical Cracks in Top Coat of TBCs During APS Deposition

Parametric Studies Of Failure Mechanisms In Thermal Barrier Coatings During Thermal Cycling Using FEM

Study on insulation and stresses of TBCs on a turbine vane under ununiform temperature field

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