The erosion of EB-PVD thermal barrier coatings: The competition between mechanisms

Fleck, N.A.; Zisis, Th.

doi:10.1016/j.wear.2009.12.020

Cited by 39 publications

(20 citation statements)

References 15 publications

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“…In particular, the top ceramic coatings have been applied to reduce the surface temperature of turbine blades, control on-demand air-cooling, and thus extend TBC service life, and improve aero-engine efficiency. However, TBCs are susceptible to various life limiting issues associated with their operating environment conditions including erosion [9][10][11], corrosion [12,13], oxidation [14,15], sintering [3,16,17], and foreign object damage (FOD) [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, small particle erosion can result in the coating failure by the propagation of elastic stress waves. In addition, the subsequence precise analysis depends upon the size and velocity of impacting particles, and also the geometric and mechanical properties of the coating [10]. Therefore, the evolution of mechanical properties and elasto-plastic deformation behavior of TBC materials play an important role in comprehensively understanding the possible erosion or FOD failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Effect of heat treatment on deformation and mechanical properties of 8 mol% yttria-stabilized zirconia by Berkovich nanoindentation

Mao

Luo

Dai

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on deformation and mechanical properties of 8 mol% yttria-stabilized zirconia by Berkovich nanoindentation

Mao

Luo

Dai

et al. 2015

Applied Surface Science

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“…Discrete modelling of the material microstructure during indentation has been carried in the context of classical continuum theories (see e.g. Chen et al, 2004;Stupkiewicz, 2007;Fleck and Zisis, 2010;Zisis and Fleck, 2010), whereas phenomenological approaches based on generalized continua have also been extensively followed (Muki and Sternberg, 1965;Poole et al, 1996;Begley and Hutchinson, 1998;Nix and Gao, 1998;Shu and Fleck, 1998;Wei and Hutchinson, 2003;Zisis et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the tilted flat punch in couple-stress elasticity

Gourgiotis

Zisis

Baxevanakis

2016

International Journal of Solids and Structures

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Abstract. In the present paper we explore the response of a half-plane indented by a tilted flat punch with sharp corners in the context of couple-stress elasticity theory. Contact conditions arise in a number of modern engineering applications ranging from structural and geotechnical engineering to micro and nanotechnology. As the contact scales reduce progressively the effects of the microstructure upon the macroscopic material response cannot be ignored. The generalized continuum theory of couple-stress elasticity introduces characteristic material lengths in order to describe the pertinent scale effects that emerge from the underlying material microstructure. The problem under investigation is interesting for three reasons: Firstly, the indentor's geometry is simple so that benchmark results may be extracted. Secondly, important deterioration of the macroscopic results may emerge in the case that a tilting moment is applied on the indentor inadvertently or in the case that the flat punch itself is not self-aligning so that asymmetrical contact pressure distributions arise on the contact faces. Thirdly, the voluntary application of a tilting moment on the flat punch during an experiment gives rise to potential capabilities of the flat punch for the determination of the material microstructural characteristic lengths. The solution methodology is based on singular integral equations which have resulted from a treatment of the mixed boundary value problems via integral transforms and generalized functions. The results show significant departure from the predictions of classical elasticity revealing that valuable information may be deducted from the indentation of a tilted punch of a microstructured solid.

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“…This process has been modeled employing classical theories by directly incorporating the microstructural characteristics into the model through purely geometrical considerations (see e.g. Chen et al, 2004;Stupkiewicz, 2007;Fleck and Zisis, 2010;Zisis and Fleck, 2010) and phenomenological approaches based on gradient elasticity / plasticity ideas, or on discrete dislocation concepts (Muki and Sternberg, 1965;Poole et al, 1996;Begley and Hutchinson, 1998;Nix and Gao, 1998;Shu and Fleck, 1998;Wei and Hutchinson, 2003;Danas et al, 2012;Zisis et al, 2014;). Even though, purely elastic indentation of materials is hard to achieve in practice (Larsson et al, 1996), elasticity can be of interest in particular cases.…”

Section: Introductionmentioning

confidence: 99%

A contact problem in couple stress thermoelasticity: The indentation by a hot flat punch

Zisis

Gourgiotis

Corso

2015

International Journal of Solids and Structures

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Please cite this article as: Zisis, Th., Gourgiotis, P.A., Dal Corso, F., A contact problem in couple stress thermoelasticity: The indentation by a hot flat punch, International Journal of Solids and Structures (2015), doi: http://dx. AbstractIt is well known, that thermo-elastic effects may have significant results upon the macroscopic response in the mechanics of contact. On the other hand, as the scales in the contact system reduce progressively (micro to nano-scales), the internal material lengths become important and their effect upon the macroscopic response cannot be ignored. The present work extends the classical contact solution for a hot flat punch indenting a homogeneous elastic half-plane, where heat conduction is permitted (Comninou et al., 1981), to the analogous case of an indented microstructured solid. The behavior of the indented material is modelled through the couple-stress elasticity theory, which introduces characteristic material lengths and is appropriately modified in order to incorporate the thermal effects. The problem formulation is based on singular integral equations, resulted from a treatment of the mixed boundary value problems via integral transforms and generalized functions. The results show significant departure from the predictions of classical thermoelasticity showing that the microstructural characteristics of the material should not be ignored.

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The erosion of EB-PVD thermal barrier coatings: The competition between mechanisms

Cited by 39 publications

References 15 publications

Effect of heat treatment on deformation and mechanical properties of 8 mol% yttria-stabilized zirconia by Berkovich nanoindentation

Effect of heat treatment on deformation and mechanical properties of 8 mol% yttria-stabilized zirconia by Berkovich nanoindentation

Analysis of the tilted flat punch in couple-stress elasticity

A contact problem in couple stress thermoelasticity: The indentation by a hot flat punch

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