Effects of coating thickness and residual stresses on the bond strength of ASTM C633-79 thermal spray coating test specimens |
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Authors: | D J Greving J R Shadley E F Rybicki D J Greving J R Shadley E F Rybicki |
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Affiliation: | (1) Mechanical Engineering Department, The University of Tulsa, 74104-3189 Tulsa, OK, USA |
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Abstract: | Wire-arc-sprayed nickel-aluminum is widely used in the aircraft industry for dimensional restoration of worn parts and as
a bond coat for thermal barrier coatings and other top coats. Some repair applications require thick coatings, which often
result in lower bond strength. A mechanism being investigated to ex-plain this decrease in bond strength is the free edge
effect, which includes both coating residual stresses and coating thickness. The layer-removal method was used to determine
experimentally the residual stresses in wire-arc-sprayed nickel-aluminum coatings of different thicknesses. Bond strength
evalu-ations were performed using an improved ASTM C 633-79 test specimen. Finite-element analysis and fracture mechanics
were used to investigate the effects of coating thickness and residual stress state on coating bond strength. |
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Keywords: | ASTM C 633-79 coating thickness finite-element analysis mechanical properties residual stress |
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