Direct strain-controlled variable strain rate low cycle fatigue testing in simulated PWR water

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    Abstract

    A tailored-for-purpose environmental fatigue testing facility was previously developed to perform direct strain-controlled tests on stainless steel in simulated PWR water. Strain in specimen mid-section is generated by the use of pneumatic bellows, and eddy current measurement is used as a feedback signal. The procedure conforms with the ASTM E 606 practice for low cycle fatigue, giving results which are directly compatible with the major NPP design codes. Past studies were compiled in the NUREG/CR-6909 report and environmental reduction factors Fen were proposed to account for fatigue life reduction in hot water as compared to a reference value in air. This database exclusively contained nonstabilized stainless steels, mainly tested under stroke control. The applicability of the stainless steel Fen factor for stabilized alloys was already challenged in past papers (PVP2013-97500, PVP2014-28465). The results presented in this paper follow the same overall trend of lower experimental values (4.12-11.46) compared to those expected according to the NUREG report (9.49-10.37). In this paper results of a dual strain rate test programme on niobium stabilized AISI 347 type stainless steel are presented and discussed in the context of the NUREG/CR-6909 Fen methodology. Special attention is paid to the effect of strain signal on fatigue life, which according to current prediction methods does not affect the value of F en.
    Original languageEnglish
    Title of host publicationASME 2016 Pressure Vessels and Piping Conference
    Subtitle of host publicationCodes and Standards
    PublisherAmerican Society of Mechanical Engineers ASME
    Number of pages5
    Volume1A
    ISBN (Print)978-0-7918-5035-0
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventASME 2016 Pressure Vessels and Piping Conference - Vancouver, Canada
    Duration: 17 Jul 201621 Jul 2016

    Conference

    ConferenceASME 2016 Pressure Vessels and Piping Conference
    CountryCanada
    CityVancouver
    Period17/07/1621/07/16

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    Keywords

    • alloy steel
    • eddy current testing
    • fatigue of materials
    • fatigue testing
    • pressure vessels
    • stainless steel
    • steel testing
    • environmental fatigue
    • experimental values
    • fatigue life reduction
    • low cycle fatigue testing
    • low cycle fatigues
    • prediction methods
    • strain rate tests
    • strain-controlled

    Cite this

    Seppänen, T., Alhainen, J., Arilahti, E., & Solin, J. (2016). Direct strain-controlled variable strain rate low cycle fatigue testing in simulated PWR water. In ASME 2016 Pressure Vessels and Piping Conference: Codes and Standards (Vol. 1A). [PVP2016-63294] American Society of Mechanical Engineers ASME. https://doi.org/10.1115/PVP2016-63294