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

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    4 Citations (Scopus)

    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

    Fingerprint

    Fatigue testing
    Strain rate
    Stainless steel
    Fatigue of materials
    Water
    Environmental testing
    Bellows
    Electric current measurement
    Eddy currents
    Niobium
    Pneumatics
    Feedback
    Air

    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
    Seppänen, Tommi ; Alhainen, Jouni ; Arilahti, Esko ; Solin, Jussi. / Direct strain-controlled variable strain rate low cycle fatigue testing in simulated PWR water. ASME 2016 Pressure Vessels and Piping Conference: Codes and Standards. Vol. 1A American Society of Mechanical Engineers ASME, 2016.
    @inproceedings{a5f16b2622a0444eb5bda71de78c6303,
    title = "Direct strain-controlled variable strain rate low cycle fatigue testing in simulated PWR water",
    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.",
    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",
    author = "Tommi Sepp{\"a}nen and Jouni Alhainen and Esko Arilahti and Jussi Solin",
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    address = "United States",

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    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, ASME 2016 Pressure Vessels and Piping Conference, Vancouver, Canada, 17/07/16. https://doi.org/10.1115/PVP2016-63294

    Direct strain-controlled variable strain rate low cycle fatigue testing in simulated PWR water. / Seppänen, Tommi; Alhainen, Jouni; Arilahti, Esko; Solin, Jussi.

    ASME 2016 Pressure Vessels and Piping Conference: Codes and Standards. Vol. 1A American Society of Mechanical Engineers ASME, 2016. PVP2016-63294.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    AU - Seppänen, Tommi

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    AU - Arilahti, Esko

    AU - Solin, Jussi

    PY - 2016

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    N2 - 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.

    AB - 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.

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    KW - fatigue of materials

    KW - fatigue testing

    KW - pressure vessels

    KW - stainless steel

    KW - steel testing

    KW - environmental fatigue

    KW - experimental values

    KW - fatigue life reduction

    KW - low cycle fatigue testing

    KW - low cycle fatigues

    KW - prediction methods

    KW - strain rate tests

    KW - strain-controlled

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    DO - 10.1115/PVP2016-63294

    M3 - Conference article in proceedings

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    VL - 1A

    BT - ASME 2016 Pressure Vessels and Piping Conference

    PB - American Society of Mechanical Engineers ASME

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    Seppänen T, Alhainen J, Arilahti E, Solin J. 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. American Society of Mechanical Engineers ASME. 2016. PVP2016-63294 https://doi.org/10.1115/PVP2016-63294