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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Mechanisms of elastodynamic erosion of electron-beam thermal barrier coatings

Athanasios Zisis and Norman A. Fleck

Abstract

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.


* Correspondence address, Prof. Norman A. Fleck, Cambridge University Engineering Dept., Trumpington Street, Cambridge, CB2 1PZ, UK. Tel.: +44 1223 748 240, Fax: +44 1223 332 662, E-mail:

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Received: 2007-3-26
Accepted: 2007-9-9
Published Online: 2013-06-11
Published in Print: 2007-12-01

© 2007, Carl Hanser Verlag, München

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