Interfacial damage based life model for EB-PVD thermal barrier coating

Courcier, Christophe; Maurel, Vincent; Rémy, Luc; Quilici, Stéphane; Rouzou, Isabelle; Phelippeau, Antoine

doi:10.1016/j.surfcoat.2011.01.008

Cited by 46 publications

(46 citation statements)

References 59 publications

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“…They can be considered to be a function of local microstructural and mechanical variables such as, among others, oxide thickness and growth strains, out-of-plane stress component or bond-coat ratchetting behaviour [161][162][163][164][165][166]. In some TBCs, the top ceramic layer is known to fail by buckling involving a global in-plane compressive state, as predicted by either a critical in-plane stress/strain [167] or an energy based criterion [168][169][170]. Furthermore, some TBC systems are prone to developing complex 3D morphologies, such as that due to the rumpling mechanism which develops under thermal cycling [171,172].…”

Section: Microstructural Degradation Due To Surface Oxidationmentioning

confidence: 99%

Failure of metals II: Fatigue

Pineau¹,

McDowell²,

Busso³

et al. 2016

Acta Materialia

246

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Section: Microstructural Degradation Due To Surface Oxidationmentioning

confidence: 99%

Failure of metals II: Fatigue

Pineau¹,

McDowell²,

Busso³

et al. 2016

Acta Materialia

246

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“…Therefore, an important issue is how to predict the occurrence time of such a critical fracture, namely, a critical point or precursory time. In TBCs, single isolated microcracks firstly appear, and then, with the increase of load or time of loading, they grow and multiply, leading to an increase of the crack density or length [3,5,6,37]. As a consequence, microcracks begin to merge until a critical density (or a critical length) of cracks is reached, at which the main fracture occurs.…”

Section: Precursory Time Of Coating Spallationmentioning

confidence: 99%

“…Moreover, these microcracks are correlated with each other in space and time [3,6,37]. Therefore, the criticality or precursory phenomena can be traced back by the interplay between the pre-existing heterogeneity and the correlated growth of cracks mediated by the singularities of damage parameters.…”

Section: Precursory Time Of Coating Spallationmentioning

confidence: 99%

Damage evolution and rupture time prediction in thermal barrier coatings subjected to cyclic heating and cooling: An acoustic emission method

Yang

Zhou

2011

Acta Materialia

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The real-time testing and quantitative assessment of damage evolution in thermal barrier coatings (TBCs) is desirable, but still intractable, especially at elevated temperature. In this paper, the fracture process of TBCs subjected to cyclic heating and cooling is monitored using an acoustic emission method. Based on the wavelet analysis of acoustic emission signals, damage modes in TBCs are discriminated. The results show that, due to thermal stress, it is preferential for vertical cracks in the heating stage and interface cracks in the cooling stage. The surface crack density and interface crack length are calculated to obtain the quantitative correlation of damage evolution in TBCs and acoustic emission parameters. The rupture time of TBCs can be predicted by the statistical analysis of acoustic emission signals.

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“…Despite of great advances in coating technology, blistering still remains one of the serious problems and important parameters [9][10][11][12][13]. It is, therefore, essential to understand the physical and metallurgical phenomenon of blistering from both scientific and engineering point of view.…”

Section: Introductionmentioning

confidence: 99%

A model for cathodic blister growth in coating degradation using mesomechanics approach

Nazir

Khan

Saeed

et al. 2015

Materials & Corrosion

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The paper presents a novel theoretical model of blistering initiation and propagation especially useful for coating life assessment. The focus is on initially circular blisters. A two-part theoretical analysis of blistering is conducted using mesomechanics approach coupling diffusion concepts with fracture mechanics concepts. The diffusion concept is used to treat the corrosive species transport, eventually causing corrosion and blistering, while the fracture mechanics concept is used to treat the blister growth as circular crack propagation. Effects of thickness ratio and modulus ratio on blistering propagation are discussed. A simple criterion is identified which excludes the possibility of widespread blister propagation. Furthermore, a comparative study with the existing blistering models is carried out. Experiments are reported for blistering using a model coating-substrate system, chosen to allow visualisation of interface and to permit coupled (diffusion and residual) stresses in the coating over a full range of interest. The predicted limits from theoretical model are expected to be useful for the manufacturers in the design and deposition of coatings.

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Interfacial damage based life model for EB-PVD thermal barrier coating

Cited by 46 publications

References 59 publications

Failure of metals II: Fatigue

Failure of metals II: Fatigue

Damage evolution and rupture time prediction in thermal barrier coatings subjected to cyclic heating and cooling: An acoustic emission method

A model for cathodic blister growth in coating degradation using mesomechanics approach

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