Three Dimensional Modeling of Inclined Surface Cracks in FGM Coatings

Sadik Kosker; Serkan Dag; Boray Yildirim

doi:10.4028/www.scientific.net/MSF.631-632.109

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HomeMaterials Science ForumMaterials Science Forum Vols. 631-632Three Dimensional Modeling of Inclined Surface...

Three Dimensional Modeling of Inclined Surface Cracks in FGM Coatings

Abstract:

This study presents a three dimensional finite element method for mixed-mode fracture analysis of an FGM coating-bond coat-substrate structure. The FGM coating is assumed to contain an inclined semi-elliptical crack at the free surface. The trilayer structure is examined under the effect of transient thermal stresses. Strain singularity around the crack front is simulated by utilizing collapsed wedge-shaped singular elements. The modes I, II and III stress intensity factors are computed by applying the displacement correlation technique and presented as a function of time. Four different FGM coating types are examined in the parametric analyses which are metal-rich, ceramic-rich, linear variation and homogeneous coatings. The results provided illustrate the influences of the FGM coating type and crack inclination angle on the transient behavior of the mixed-mode stress intensity factors.

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Periodical:

Materials Science Forum (Volumes 631-632)

Pages:

109-114

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.631-632.109

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Online since:

October 2009

Authors:

Sadik Kosker, Serkan Dag, Boray Yildirim

Keywords:

Displacement Correlation Technique, Finite Element Model (FEM), Functionally Graded Material (FGM), Semi-Elliptical Surface Crack, Thermal Stress

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References

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