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EA4T railway axle steel fatigue behavior under very high-frequency fatigue loading

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    SYSNO ASEP0525035
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleEA4T 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, ORCID
    Number of authors4
    Article number104668
    Source TitleEngineering Failure Analysis. - : Elsevier - ISSN 1350-6307
    Roč. 115, SEP (2020)
    Number of pages8 s.
    Languageeng - English
    CountryGB - United Kingdom
    Keywords20 kHz ; EA4T ; Fatigue ; Non-inclusion fatigue crack initiation
    Subject RIVJR - Other Machinery
    OECD categoryMechanical engineering
    R&D ProjectsTN01000071 GA TA ČR - Technology Agency of the Czech Republic (TA ČR)
    Method of publishingLimited access
    Institutional supportUFM-A - RVO:68081723
    UT WOS000554860000006
    EID SCOPUS85086075266
    DOI10.1016/j.engfailanal.2020.104668
    AnnotationOne 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.
    WorkplaceInstitute of Physics of Materials
    ContactYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Year of Publishing2021
    Electronic addresshttps://www.sciencedirect.com/science/article/pii/S1350630719309306?via%3Dihub
Number of the records: 1