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000013867 084__ $$2WoS$$aMechanics
000013867 1001_ $$0P:(DE-HGF)0$$aLimarga, A.M.$$b0
000013867 245__ $$aStress Distributions in Plasma-Sprayed Thermal Barrier Coatings Under Thermal Cycling in a Temperature Gradient
000013867 260__ $$aNew York, NY$$bASME$$c2011
000013867 300__ $$a1 - 9
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000013867 440_0 $$023541$$aJournal of Applied Mechanics - TRANSACTIONS OF THE ASME$$v78$$x0021-8936$$y1
000013867 500__ $$aThis 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).
000013867 520__ $$aThe residual stress distribution in plasma-sprayed zirconia thermal barrier coatings subjected to cyclic thermal gradient testing was evaluated using Raman piezospectroscopy and finite element computation. The thermal gradient testing (approximately 440 degrees C/mm at temperature), consisted of repeated front-side heating with a flame and constant cooling of the back-side of the substrate either with front-side radiative cooling only or with additional forced air cooling between the heating cycles. The coatings exhibited characteristic "mud-cracking" with the average crack spacing dependent on the cooling treatment. This is consistent with finite element calculations and Raman spectroscopy measurements in which the sudden drop in coating surface temperature on initial cooling leads to a large biaxial tension at the surface. The key to proper interpretation of the Raman shifts is that the stress-free Raman peaks need to be corrected for shifts associated with the evolution of the metastable tetragonal phase with aging. [DOI: 10.1115/1.4002209]
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000013867 65320 $$2Author$$athermal barrier coating
000013867 65320 $$2Author$$aRaman piezospectroscopy
000013867 65320 $$2Author$$aresidual stress
000013867 65320 $$2Author$$athermal gradient
000013867 650_7 $$2WoSType$$aJ
000013867 7001_ $$0P:(DE-Juel1)129670$$aVaßen, R.$$b1$$uFZJ
000013867 7001_ $$0P:(DE-HGF)0$$aClarke, D.R.$$b2
000013867 773__ $$0PERI:(DE-600)2021620-8$$a10.1115/1.4002209$$gVol. 78, p. 1 - 9$$p1 - 9$$q78<1 - 9$$tJournal of applied mechanics$$v78$$x0021-8936$$y2011
000013867 8567_ $$uhttp://dx.doi.org/10.1115/1.4002209
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