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Fatigue Crack Growth in Bodies with Thermally Sprayed Coating
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SYSNO ASEP 0454445 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Fatigue Crack Growth in Bodies with Thermally Sprayed Coating Author(s) Kovařík, O. (CZ)
Haušild, P. (CZ)
Medřický, J. (CZ)
Tomek, L. (CZ)
Siegl, J. (CZ)
Mušálek, Radek (UFP-V) RID, ORCID
Curry, N. (SE)
Bjorklund, S. (SE)Source Title 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.-C. ; Toma F.-L. ; Turunen E. ; Widener C. - ISBN 978-1-62708-093-4 Pages s. 398-405 Number of pages 8 s. Publication form Medium - C Action ITSC 2015: International Thermal Spray Conference and Exposition Event date 11.05.2015-14.05.2015 VEvent location Long Beach, California Country US - United States Event type WRD Language eng - English Country US - United States Keywords thermal spray ; thermal barrier coating ; fatigue Subject RIV JK - Corrosion ; Surface Treatment of Materials R&D Projects GB14-36566G GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 EID SCOPUS 84962917609 Annotation 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. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2016
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