| EPSRC Reference: |
GR/L58132/01 |
| Title: |
FE MODELLING OF THE STRESS STATE DEVELOPED IN THERMAL BARRIER COATINGS SUBJECTED TO THERMOMECHANICAL FATIQUE |
| Principal Investigator: |
Knowles, Dr D |
| Other Investigators: |
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| Department: |
Materials Science & Metallurgy |
| Organisation: |
University of Cambridge |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
31 May 1997 |
Ends: |
29 November 1998 |
Value (£): |
52,448
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| EPSRC Research Topic Classifications: |
| Materials Characterisation |
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| EPSRC Industrial Sector Classifications: |
| No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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Engine experience indicates that thermal barrier coatings primarily fail by two potential mechanisms. The first is spallation of the ceramic layer at the interface with the bond coat, exposing the substrate to the high temperature gas environment in which it cannot maintain structural integrity. The second is cracking in the underlying bond coat (invisible from periodic surface inspection) which can propagate into the superalloy substrate leading to premature blade failure. The principal aims of this programme are thus: to adapt the thermomechanical fatigue testing facilities at Cambridge to test specimens with a thin non metallic surface coating. to identify experimentally the most damaging thermomechanical fatigue cycles and the corresponding failure mode. to produce a FE model which can predict the shakedown stresses which develop in thermal barrier coatings subjected to thermomechanical fatigue. to use the model to predict the influence of the constraining ceramic surface layer and the growth of an interfacial oxide layer on the stress levels in the bond coat. to compare the results of the model with an experimental thermomechanical test programme.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.cam.ac.uk |