Submodeling method to study the residual stress of TBCs near the interfacial asperity on a vane

Liu, J.H.; Liu, Y.B.; Liu, L.; Yu, Youhong; He, Xing

doi:10.1016/j.engfailanal.2021.105220

Cited by 8 publications

(3 citation statements)

References 45 publications

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“…The displacement of the macro model was mapped to the other five surfaces of SRVE except for the rough surface as boundary conditions, which can greatly characterize the stress state at different positions on rough surfaces, such as wave peaks and valleys. 37 The boundary conditions of the macro model were the same as that of the actual fatigue specimen. The geometry and boundary conditions of the macro model as well as the embedding of a SRVE are shown in Figure 7A.…”

Section: Microstructure Instantiationsmentioning

confidence: 99%

“…The boundary conditions of the model were determined by the submodeling method. The displacement of the macro model was mapped to the other five surfaces of SRVE except for the rough surface as boundary conditions, which can greatly characterize the stress state at different positions on rough surfaces, such as wave peaks and valleys 37 . The boundary conditions of the macro model were the same as that of the actual fatigue specimen.…”

Section: Microstructure Modeling Including Surface Integrity Characte...mentioning

confidence: 99%

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A crystal plastic finite element model for the effect of surface integrity on multiaxial fatigue life after multistage machining processes

Liang,

Jiao,

Yan

et al. 2024

Fatigue Fract Eng Mat Struct

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Surface integrity influences the material fatigue performance significantly, but most micromechanical models based on crystal plasticity only consider the microstructure of the matrix. In this paper, a crystal plastic finite element modeling method was proposed, which simultaneously considered surface roughness, residual stress, and gradual microstructure. It was verified through multiaxial fatigue experiments of materials processed by different multistage machining processes. The results show that larger axial residual compressive stress and smaller grain size can lead to higher multiaxial fatigue life. The existence of residual compressive stress causes the location of material crack initiation to decrease from the surface layer to the subsurface layer. The proposed model can predict the multiaxial fatigue life of materials within a 50% error band.

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Section: Microstructure Instantiationsmentioning

confidence: 99%

Section: Microstructure Modeling Including Surface Integrity Characte...mentioning

confidence: 99%

A crystal plastic finite element model for the effect of surface integrity on multiaxial fatigue life after multistage machining processes

Liang,

Jiao,

Yan

et al. 2024

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…41. The TGO generated at the interface of the YSZ/bond coat has characteristics of wedge-type growth, low CTE, and high in-plane interior stress, which deteriorates the adhesive strength of the interface in TBCs [211][212][213]. However, the adhesive strength at the interface is higher than the cohesive strength in the YSZ when TGO is in the initial growth phase [214,215].…”

Section: Delamination By Tgo Growthmentioning

confidence: 99%

Progress in ceramic materials and structure design toward advanced thermal barrier coatings

et al. 2022

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Thermal barrier coatings (TBCs) can effectively protect the alloy substrate of hot components in aeroengines or land-based gas turbines by the thermal insulation and corrosion/erosion resistance of the ceramic top coat. However, the continuous pursuit of a higher operating temperature leads to degradation, delamination, and premature failure of the top coat. Both new ceramic materials and new coating structures must be developed to meet the demand for future advanced TBC systems. In this paper, the latest progress of some new ceramic materials is first reviewed. Then, a comprehensive spalling mechanism of the ceramic top coat is summarized to understand the dependence of lifetime on various factors such as oxidation scale growth, ceramic sintering, erosion, and calcium-magnesium-aluminium-silicate (CMAS) molten salt corrosion. Finally, new structural design methods for high-performance TBCs are discussed from the perspectives of lamellar, columnar, and nanostructure inclusions. The latest developments of ceramic top coat will be presented in terms of material selection, structural design, and failure mechanism, and the comprehensive guidance will be provided for the development of next-generation advanced TBCs with higher temperature resistance, better thermal insulation, and longer lifetime.

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Multi-scale modelling of the thermally coupled planetary roller screw mechanism with curved fractal contact

Miao

Du²,

Li³

et al. 2022

Meccanica

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Submodeling method to study the residual stress of TBCs near the interfacial asperity on a vane

Cited by 8 publications

References 45 publications

A crystal plastic finite element model for the effect of surface integrity on multiaxial fatigue life after multistage machining processes

A crystal plastic finite element model for the effect of surface integrity on multiaxial fatigue life after multistage machining processes

Progress in ceramic materials and structure design toward advanced thermal barrier coatings

Multi-scale modelling of the thermally coupled planetary roller screw mechanism with curved fractal contact

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