Fatigue Crack Growth in Bodies with Thermally Sprayed Coating

0459820 - ÚFP 2017 RIV US eng J - Journal Article
Kovářík, O. - Haušild, P. - Medřický, Jan - Tomek, L. - Siegl, J. - Mušálek, Radek - Curry, N. - Björklund, S.
Fatigue Crack Growth in Bodies with Thermally Sprayed Coating.
Journal of Thermal Spray Technology. Roč. 25, 1-2 (2016), s. 311-320. ISSN 1059-9630. E-ISSN 1544-1016.
[ITSC 2015: International Thermal Spray Conference and Exposition. Long Beach, California, 11.05.2015-14.05.2015]
R&D Projects: GA ČR GB14-36566G
Institutional support: RVO:61389021
Keywords : Thermal barrier coating * fatigue * crack growth * digital image correlation * digital image correlation
Subject RIV: JK - Corrosion ; Surface Treatment of Materials
Impact factor: 1.488, year: 2016
http://link.springer.com/article/10.1007%2Fs11666-015-0329-9

Many applications of thermally sprayed coatings call for increased fatigue resistance of coated parts. Despite the intensive research in this area, the influence of coating on fatigue is still not completely understood. In this paper, the localization of crack initiation sites and the dynamics of crack propagation are studied. The resonance bending fatigue test was employed to test flat specimens with both sides coated. Hastelloy-X substrates coated with classical thermal barrier coating consisting of yttria stabilized zirconia and NiCoCrAlY layers. The strain distribution on the coating surface was evaluated by the Digital Image Correlation method through the whole duration of the fatigue test. Localization of crack initiation sites and the mode of crack propagation in the coated specimen are related to the observed resonance frequency. ...
Permanent Link: http://hdl.handle.net/11104/0259974