Interface thermal fracture in functionally graded zirconia–mullite–bond coat alloy thermal barrier coatings

Rangaraj, Sudarshan; Kokini, Klod

doi:10.1016/s1359-6454(02)00396-8

Cited by 55 publications

(16 citation statements)

References 30 publications

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“…FGMs employed in applications such as thermal barrier coatings are exposed to severe stress gradients induced by thermal and/or mechanical loading. These harsh conditions frequently lead to the formation of surface cracks, which are a significant failure mechanism in FGM coatings ͑e.g., Choules et al 2001;Rangaraj and Kokini 2003͒. Many works develop numerical techniques to analyze cracks in twodimensional ͑2D͒ FGM specimens ͑e.g., Eischen 1987;Konda and Erdogan 1994;Gu et al 1999;Anlas et al 2000;Chan et al 2001;Dag and Erdogan 2002;Dolbow and Gosz 2002;Kim and Paulino 2002a;Chan et al 2003;Kim and Paulino 2003a;Huang and Wang 2004;Kim and Paulino 2004͒, but few establish methods to analyze three-dimensional ͑3D͒ fractures such as the surface crack.…”

Section: Introductionmentioning

confidence: 99%

Computation of Mixed-Mode Stress Intensity Factors for Cracks in Three-Dimensional Functionally Graded Solids

2006

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This work applies a two-state interaction integral to obtain stress intensity factors along cracks in three-dimensional functionally graded materials. The procedures are applicable to planar cracks with curved fronts under mechanical loading, including crack-face tractions. Interaction-integral terms necessary to capture the effects of material nonhomogeneity are identical in form to terms that arise due to crack-front curvature. A discussion reviews the origin and effects of these terms, and an approximate interaction-integral expression that omits terms arising due to curvature is used in this work to compute stress intensity factors. The selection of terms is driven by requirements imposed by material nonhomogeneity in conjunction with appropriate mesh discretization along the crack front. Aspects of the numerical implementation with ͑isoparametric͒ graded finite elements are addressed, and examples demonstrate the accuracy of the proposed method.

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Section: Introductionmentioning

confidence: 99%

Computation of Mixed-Mode Stress Intensity Factors for Cracks in Three-Dimensional Functionally Graded Solids

2006

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“…[79][80][81][82][83] Advanced gas turbine running at higher temperatures is used for power generation to meet increased demand of electricity. The wide range of materials used in these composite coatings includes mullite/alumina, mullite/zirconia, mullite/silicon carbide, mullite/molybdenum.…”

Section: Application Of Mullite In Coating Technologymentioning

confidence: 99%

“…The wide range of materials used in these composite coatings includes mullite/alumina, mullite/zirconia, mullite/silicon carbide, mullite/molybdenum. [79][80][81][82][83] Advanced gas turbine running at higher temperatures is used for power generation to meet increased demand of electricity. To develop new generation turbines and micro turbines, major concerns are economical and environmental aspects, that is, improving efficiency and reducing emissions.…”

Section: Application Of Mullite In Coating Technologymentioning

confidence: 99%

Solgel‐Processed Mullite Coating—A Review

Roy¹,

Das²,

Maitra³

2014

Int J Applied Ceramic Tech

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Mullite is one of the popular ceramic materials for different engineering applications due to some of its important properties which include good thermal and chemical stability, high creep resistance, etc. Mullite synthesized by solgel process generally requires lower temperature for processing and generate product with better homogeneity and more purity compared with other conventional processes. Coating of solgel‐derived mullite film on surface of a ceramic substrate can improve its thermomechanical properties, making it suitable for applications in different aggravated conditions. This study embarks a comprehensive review on synthesis, characterization and applications of solgel‐derived mullite coating.

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“…[18,19] The strain-mismatch-induced fracture could occur in the form of layer delamination, surface cracking, or combination of both, depending on the layers to diverse engineering applications including soterial properties. Extensive research has studied the strain-mismatch-induced failure of hard material multilayer structures, such as interfacial delamination of thermal barrier coatings (TBC), [20][21][22][23][24][25][26] thermal fatigue of transistors, [27] cracking of ceramic actuators, [16] and supercapacitor. [28] Fracture of hard coating printed on soft substrate has also received considerable interest.…”

Section: Introductionmentioning

confidence: 99%

Study of Interfacial Interactions in Physically Transient Soft Layered Structures: A Step toward Understanding Interfacial Bonding and Failure in Soft Degradable Structures

et al. 2017

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Soft multilayer structures have broad applications in transient electronics. Strain-mismatch-induced fracture is key in achieving physical transiency. Here, swelling-mismatch-induced fragmentation of physically transient electrodes is studied. The fragment size of the electrode layer as a function of initial defect distribution is investigated. The average fragment size is predicted and verified by a combination of experimental and FEM analysis. It is found that only large defects initiate fragmentation; this concept can be used to control disintegration of physically transient electronics by means of materials and design, and can be extended to study transiency of soft multilayer structures.

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Interface thermal fracture in functionally graded zirconia–mullite–bond coat alloy thermal barrier coatings

Cited by 55 publications

References 30 publications

Computation of Mixed-Mode Stress Intensity Factors for Cracks in Three-Dimensional Functionally Graded Solids

Computation of Mixed-Mode Stress Intensity Factors for Cracks in Three-Dimensional Functionally Graded Solids

Solgel‐Processed Mullite Coating—A Review

Study of Interfacial Interactions in Physically Transient Soft Layered Structures: A Step toward Understanding Interfacial Bonding and Failure in Soft Degradable Structures

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