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Fatigue Crack Growth in Bodies with Thermally Sprayed Coating

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    0454445 - ÚFP 2016 RIV US eng C - Conference Paper (international conference)
    Kovařík, O. - Haušild, P. - Medřický, J. - Tomek, L. - Siegl, J. - Mušálek, Radek - Curry, N. - Bjorklund, S.
    Fatigue Crack Growth in Bodies with Thermally Sprayed Coating.
    Thermal Spray 2015: Proceedings from the International Thermal Spray Conference. Materials Park, OH: ASM International, 2015 - (McDonald, A.; Agarwal, A.; Bolelli, G.; Concustell, A.; Lau, Y.; Toma, F.; Turunen, E.; Widener, C.), s. 398-405. ITSC. ISBN 978-1-62708-093-4.
    [ITSC 2015: International Thermal Spray Conference and Exposition. Long Beach, California (US), 11.05.2015-14.05.2015]
    R&D Projects: GA ČR GB14-36566G
    Institutional support: RVO:61389021
    Keywords : thermal spray * thermal barrier coating * fatigue
    Subject RIV: JK - Corrosion ; Surface Treatment of Materials

    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 spatiotemporal localization of crack initiation and the dynamics of crack propagation are studied. The resonance bending fatigue test is employed to test flat specimens with both sides coated. Hastelloy-X substrates coated with classical TBC YSZ/NiCoCrAlY composites were tested. The strain distribution on the coating surface is evaluated by the digital image correlation method (DIC) 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. The individual phases of specimen degradation, i.e. the changes of material properties, crack initiation, and crack propagation are identified.
    Permanent Link: http://hdl.handle.net/11104/0255137

     
     
Number of the records: 1