The impact of the growth of thermally grown oxide layer on the propagation of surface cracks within thermal barrier coatings

Lv, Junnan; Fan, Xueling; Li, Qun

doi:10.1016/j.surfcoat.2016.10.039

Cited by 21 publications

(4 citation statements)

References 38 publications

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“…The TBCs thickness has a great influence on thermal insulation performance. The premature failure of the coating directly exposes the superalloy to the high temperature environment, resulting in a detrimental effect on the performances of aero-engine [6][7][8][9][10][11]. Therefore, in order to guarantee the structural integrity and service performance of aero-engine blades, it is necessary to effectively monitor the structural integrity of TBCs.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Thermal Barrier Coatings Thickness Using Terahertz Technique Combined with PCA–GA–ELM Algorithm

Yuan

Zhang

et al. 2022

Coatings

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Thermal barrier coatings (TBCs) are usually used in high temperature and harsh environment, resulting in thinning or even spalling off. Hence, it is vital to detect the thickness of the TBCs. In this study, a hybrid machine learning model combined with terahertz time-domain spectroscopy technology was designed to predict the thickness of TBCs. The terahertz signals were obtained from the samples prepared in laboratory and actual turbine blade. The principal component analysis (PCA) method was used to decrease the data dimensions. Finally, an extreme learning machine (ELM) was proposed to establish the thickness of TBCs prediction model. Genetic algorithm (GA) was selected to optimize the model to make it more accurate. The results showed that the root correlation coefficient (R2) exceeded 0.97 and the errors (root mean square error and mean absolute percentage error) were less than 2.57. This study proposes that terahertz time-domain technology combined with PCA–GA–ELM model is accurate and feasible for evaluating the thickness of the TBCs.

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Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Thermal Barrier Coatings Thickness Using Terahertz Technique Combined with PCA–GA–ELM Algorithm

Yuan

Zhang

et al. 2022

Coatings

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“…Laser cladding and similar procedures can be highly recommended, and can supplement or even replace some older technologies that are ecologically disadvantageous. Today, many recent scientific works are devoted to investigations into the behavior of metal layers [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Influence of the interphase between laser-cladded metal layer and steel substrate on fatigue propagation of a short edge crack

Malíková

Doubek

Miarka

et al. 2021

Frattura Ed Integrità Strutturale

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Laser cladding is a relatively new technology how to combine properties of various materials. Thus, bi-material interfaces are presented in real structures and can affect the fatigue crack propagation. A cracked bar subjected to pure tensile loading is numerically simulated in this work in order to analyze the effect of the interphase layer between the cladded metal layer and the steel substrate on crack growth in the surface layer. Particularly, the influence of various Young’s modulus of the interphase on the stable/unstable edge crack propagation is assessed. Moreover, the number of cycles necessary for achievement of the defined critical crack length is calculated and it is summarized that knowledge of elastic properties of the thin interphase is crucial for fracture and fatigue analyses.

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“…The behavior of crack deflection/penetration in composites was investigated by the configurational force theory (Sun et al, 2018). Lv et al (2017) adopted the theory to analyze the influence of growth of the thermal barrier coating layer on the crack-tip driving force. Baxevanakis and Georgiadis (2019) discussed the energy release rate and the configurational force exerted on a climb dislocation dipole, and found that the energy release rate was significantly influenced by the defect distance and the characteristic material length.…”

Section: Introductionmentioning

confidence: 99%

Interaction between edge dislocation and inhomogeneity of an arbitrary shape and properties under coupled thermomechanical strains

Sun¹,

Li²,

Shi³

et al. 2020

Journal of Theoretical and Applied Mechanics

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In this work, a general approximate solution for the configurational force between edge dislocation and inhomogeneity of an arbitrary shape and properties with coupled thermomechanical loads was developed on the basis of the Eshelby equivalent inclusion theory. The effect of temperature-dependent elastic properties, thermal expansion coefficient and yield strength on the configurational forces was analyzed. Furthermore, the configurational force considered to be the driving force for dislocation migration was innovatively used to investigate the interaction mechanism between graphene and internal defects of a metal.

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The impact of the growth of thermally grown oxide layer on the propagation of surface cracks within thermal barrier coatings

Cited by 21 publications

References 38 publications

Nondestructive Evaluation of Thermal Barrier Coatings Thickness Using Terahertz Technique Combined with PCA–GA–ELM Algorithm

Nondestructive Evaluation of Thermal Barrier Coatings Thickness Using Terahertz Technique Combined with PCA–GA–ELM Algorithm

Influence of the interphase between laser-cladded metal layer and steel substrate on fatigue propagation of a short edge crack

Interaction between edge dislocation and inhomogeneity of an arbitrary shape and properties under coupled thermomechanical strains

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