Cylindrical punch indentations are performed to determine the effective modulus of a plasma‐sprayed ZrO 2 –8 wt% Y 2 O 3 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. Also, the effect of a high‐heat‐flux laser treatment is shown to produce a gradient both in the effective TBC modulus and degree of loading/unloading hysteresis with depth.
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Eldridge et al. (2001) studied this question.
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