Initiation of surface and interface edge cracks in functionally graded ceramic thermal barrier coatings
Article Abstract:
The inception of surface and interface edge cracks in functionally graded ceramic thermal barrier coatings due to the application of a thermal load is analyzed. For a given specimen configuration, the unique behavior of the thermal stresses is analytically arrived at in terms of a singularity power beta and pseudo-stress intensity factors K1 and K2. Crack inception at the surface of the interface is a function of the surface temperature and the temperature difference between the surface of the coating and the substrate.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1997
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Architecture of functionally graded ceramic coatings against surface thermal fracture
Article Abstract:
The impact of architecture on the initiation of surface cracking in multilayer ceramic coatings was analytically investigated. Two kinds of cracking were analyzed. One is where the tension is caused by stress relaxation and the other is cyclic thermal fatigue. Transient temperature distributions were computed by applying a multilayer beam theory. Findings indicated that as more layers were added and as the ceramic coating became thinner, lower maximum surface stresses resulted during cooling after stress relaxation.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1996
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Methodology to predict delayed failure due to slow crack growth in ceramic tubular components using data from simple specimens
Article Abstract:
A methodology for predicting the lifetime of ceramic tubular components subjected to stress rupture conditions is discussed. The approach involves the use of slow crack growth parameters obtained from dynamic fatigue tests of O-ring and compressed C-ring specimens. The effects of these parameters on the lifetime of the ceramic components are then determined through numerical analysis. The results are found to be in very good agreement with those obtained from stress rupture tests of tensile and bend specimens.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1993
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