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Dedicated to Professor A. G. Evans on the occasion of his 65th birthday
The elastodynamic response of a columnar thermal barrier coating to normal impact by a spherical particle is explored using an explicit finite element method. The transient stress state involves a tensile component at the edge of each column, and this may lead to erosion. The contact problem can be simplified to the impact of a single column by an inclined wedge. The peak tensile stress is determined as a function of geometry of column and level of friction between wedge and columns. The initiation of a crack from a pre-existing flaw within the column is explored. The implications of the various calculations are discussed for erosion of thermal barrier coatings.
From Athanasios Zisis 1 | Norman A. Fleck 1
1Cambridge University Engineering Dept., Cambridge, UK
Appeared in International Journal of Materials Research 2007/12, Page 1196-1202
DOI: 10.3139/146.101582
Direct link: http://www.ijmr.de/directlink.asp?MK101582
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Mechanisms of elastodynamic erosion of electron-beam thermal barrier coatings [383 KB]
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