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EA4T railway axle steel fatigue behavior under very high-frequency fatigue loading
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SYSNO ASEP 0525035 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title EA4T railway axle steel fatigue behavior under very high-frequency fatigue loading Author(s) Fintová, Stanislava (UFM-A) ORCID
Pokorný, Pavel (UFM-A) ORCID
Fajkoš, R. (CZ)
Hutař, Pavel (UFM-A) RID, ORCIDNumber of authors 4 Article number 104668 Source Title Engineering Failure Analysis. - : Elsevier - ISSN 1350-6307
Roč. 115, SEP (2020)Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords 20 kHz ; EA4T ; Fatigue ; Non-inclusion fatigue crack initiation Subject RIV JR - Other Machinery OECD category Mechanical engineering R&D Projects TN01000071 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Limited access Institutional support UFM-A - RVO:68081723 UT WOS 000554860000006 EID SCOPUS 85086075266 DOI 10.1016/j.engfailanal.2020.104668 Annotation One of the most loaded components of the train, with very long operation time, is a railway axle. During its operation, the conventional fatigue limit of 107 cycles is reached easily and information about fatigue behavior for a higher number of cycles is missing. Therefore, the fatigue behavior of railway axle EA4T heat-treated steel with a bainitic microstructure was examined under very high-frequency fatigue loading. S-N curve shift to the higher number of cycles at the same stress amplitude due to the testing frequency increase was observed. However, the same fatigue endurance limit of 375 MPa was determined for 107 cycles at a frequency of 120 Hz and for 1010 cycles at a frequency of 20 kHz. Due to homogenous and fine bainitic structure in a whole tested volume of material, the same fatigue crack initiation and propagation mechanism was observed to be characteristic for all the tested specimens, regardless of the used testing frequency and stress amplitude. Surface and subsurface non-inclusion fatigue crack initiation was responsible for the failure of the specimens. Obtain results confirm, that fatigue endurance limit determined by traditional high fatigue test can be used also for several orders higher number of cycles. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S1350630719309306?via%3Dihub
Number of the records: 1