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Mesoscopic Nonlinear Elastic Modulus of Thermal Barrier Coatings Determined by Cylindrical Punch IndentationCylindrical punch indentations are performed to determine the effective modulus of a plasma-sprayed ZrO2-8Wt%Y2O3 thermal barrier coating (TBC) as a function of coating depth. Cylindrical punch indentations offer significant advantages over pointed (Vickers, Berkovich, or Knoop) indentations for materials that do not exhibit linear elastic behavior. Cyclic loading with a cylindrical punch clearly shows the TBCs to exhibit nonlinear elastic behavior with significant hysteresis that is related to the compaction and internal sliding within the plasma-spray splat microstructure. In addition, the effect of a high heat flux laser treatment was shown to produce a gradient both in the effective TBC modulus and degree of loading/unloading hysteresis with depth.
Document ID
Document Type
Preprint (Draft being sent to journal)
Eldridge, Jeffrey I.
(NASA Glenn Research Center Cleveland, OH United States)
Zhu, Dong-Ming
(NASA Glenn Research Center Cleveland, OH United States)
Miller, Robert A.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Metals And Metallic Materials
Funding Number(s)
PROJECT: RTOP 714-04-20
Distribution Limits
Work of the US Gov. Public Use Permitted.
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