Through-thickness residual stress evaluations for several industrial thermal spray coatings using a modified layer-removal method |
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Authors: | D J Greving E F Rybicki J R Shadley |
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Affiliation: | (1) Mechanical Engineering Department, The University of Tulsa, 74104-3189 Tulsa, OK, USA |
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Abstract: | Residual stresses are inherent in thermal spray coatings because the application process involves large temperature gradients
in materials with different mechanical properties. In many cases, failure analysis of thermal spray coatings has indicated
that residual stresses contribute to reduced service life. An estab-lished method for experimentally evaluating residual stresses
involves monitoring deformations in a part as layers of material are removed. Although the method offers several advantages,
applications are lim-ited to a single isotropic material and do not include coated materials. This paper describes a modified
layer-removal method for evaluating through-thickness residual stress distributions in coated materials. The modification
is validated by comparisons with three-dimensional finite-element analysis results. The modified layer-removal method was
applied to determine through-thickness residual stress distributions for six industrial thermal spray coatings: stainless
steel, aluminum, Ni-5A1, two tungsten carbides, and a ceramic thermal barrier coating. The modified method requires only ordinary
resistance strain-gage measuring equipment and can be relatively insensitive to uncertainties in the mechanical properties
of the coating material. |
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Keywords: | finite-element analysis layer removal mechanical properties strain-gage method |
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