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A Numerical Model of Ratcheting in Thermal Barrier Systems

  • Anette M. Karlsson (a1) and Anthony G. Evans (a1)
Abstract
ABSTRACT

Morphological instabilities in thermally grown oxide, observed in a range of thermal barrier systems, have been simulated by developing and using a numerical code. The simulations are based on a range of phenomena and constituent properties, such as plasticity in the bond coat and growth strains in the TGO at high temperature. One of the key implications is that the incidence of reverse yielding upon reheating is a necessary condition for morphological instabilities. That is, whenever the condition for reverse yielding is satisfied during the initial cycles, the imperfection amplitude increases with thermal cycling (ratcheting). Otherwise, shakedown occurs, i.e., the imperfection amplitude stops growing.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1. R.A. Miller , Journal of the American Ceramic Society, 67, 517 (1984)

2. T.E. Strangman , Thin Solid Films, 127, 93105 (1985).

3. P.K. Wright , A.G. Evans , Current opinion in solid state & materials science, 4, 255265 (1999)

5. J.T. DeMasi-Marcin and D.K. Gupta , Surface and Coatings Technology, 68/69, 1 (1994)

7. V.K. Tolpygo , J.R. Dryden , and D.R. Clarke , Acta Materialia, 46, 927937 (1998)

8. V.K. Tolpygo and D.R. Clarke , Acta Materialia, 48, 32833293 (2000)

9. M.Y. He , A.G. Evans , and J.W. Hutchinson , Acta Materialia, 48, 25932601 (2000).

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MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
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