Influence of TBC end geometry on the TMF life of an APS TBC

A TBC subjected to TMF loading may spall off after a sufficiently large number of cycles. This is a consequence of a combination of general fatigue damage growth and strong internal stresses caused by oxidation in the bondcoat/topcoat interface. Further, at the ends of the coating there are stress s...

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Bibliographic Details
Published in:Procedia engineering 2010-04, Vol.2 (1), p.1363-1371
Main Authors: Sjöström, Sören, Brodin, Håkan
Format: Article
Language:English
Subjects:
Early spallation from end
End chamfering
Engineering mechanics
Fastkroppsmekanik
Solid mechanics
Stress singularity
TBC
TECHNOLOGY
TEKNIKVETENSKAP
Teknisk mekanik
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Summary:A TBC subjected to TMF loading may spall off after a sufficiently large number of cycles. This is a consequence of a combination of general fatigue damage growth and strong internal stresses caused by oxidation in the bondcoat/topcoat interface. Further, at the ends of the coating there are stress singularities, at which early fatigue cracks tend to develop. This can, however, be avoided or delayed by making the coating end chamfered. This work investigates the influence of coating end chamfer on the fatigue life of an APS TBC.
ISSN:1877-7058
1877-7058
DOI:10.1016/j.proeng.2010.03.148