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@ARTICLE{Limarga:13867,
author = {Limarga, A.M. and Vaßen, R. and Clarke, D.R.},
title = {{S}tress {D}istributions in {P}lasma-{S}prayed {T}hermal
{B}arrier {C}oatings {U}nder {T}hermal {C}ycling in a
{T}emperature {G}radient},
journal = {Journal of applied mechanics},
volume = {78},
issn = {0021-8936},
address = {New York, NY},
publisher = {ASME},
reportid = {PreJuSER-13867},
pages = {1 - 9},
year = {2011},
note = {This work is supported by the Office of Naval Research,
Contract No. N00014-09-1068. The authors are grateful for
fruitful discussion with the late Prof. A.G. Evans (UCSB)
and Prof. J.W. Hutchinson (Harvard University).},
abstract = {The residual stress distribution in plasma-sprayed zirconia
thermal barrier coatings subjected to cyclic thermal
gradient testing was evaluated using Raman piezospectroscopy
and finite element computation. The thermal gradient testing
(approximately 440 degrees C/mm at temperature), consisted
of repeated front-side heating with a flame and constant
cooling of the back-side of the substrate either with
front-side radiative cooling only or with additional forced
air cooling between the heating cycles. The coatings
exhibited characteristic "mud-cracking" with the average
crack spacing dependent on the cooling treatment. This is
consistent with finite element calculations and Raman
spectroscopy measurements in which the sudden drop in
coating surface temperature on initial cooling leads to a
large biaxial tension at the surface. The key to proper
interpretation of the Raman shifts is that the stress-free
Raman peaks need to be corrected for shifts associated with
the evolution of the metastable tetragonal phase with aging.
[DOI: 10.1115/1.4002209]},
keywords = {J (WoSType)},
cin = {IEK-1},
ddc = {670},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {Rationelle Energieumwandlung},
pid = {G:(DE-Juel1)FUEK402},
shelfmark = {Mechanics},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000283739400003},
doi = {10.1115/1.4002209},
url = {https://juser.fz-juelich.de/record/13867},
}