Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water

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

    3 Citations (Scopus)

    Abstract

    In order to perform design code (ASME III, RCC-M, JSME) compatible direct strain-controlled tests in simulated PWR water, a unique environmental fatigue testing facility was previously developed. Pneumatic bellows are used to generate strain in the stainless steel specimen mid-section, while eddy current based measurement is used as a feedback signal. The NUREG/CR-6909 report gathered a large database of test results and proposed environmental reduction factors (Fen) to account for a reduction in fatigue life in simulated LWR environment when comparing to a reference value in air. The database was composed of non-stabilized stainless steels tested using methods which are not directly comparable to those used in air to define the reference curves. Applicability of the stainless steel Fen factors has already been challenged in previous PVP papers (PVP2013-97500, PVP2014-28465, PVP2016-63294). Results in this paper continue to show this trend of lower experimental Fen factors compared to predictions made by the NUREG report. Dual strain rate tests were performed, specifically focusing on the effect of strain waveform shape on fatigue life. Similarly to last year's results (PVP2016-63294) a distinct effect of strain waveform, presently inadequately accounted for in Fen predictions, was observed.

    Original languageEnglish
    Title of host publicationASME 2017 Pressure Vessels and Piping Conference
    PublisherAmerican Society of Mechanical Engineers ASME
    Volume1A
    ISBN (Electronic)978-0-7918-5790-8
    ISBN (Print)978-0-7918-5790-8
    DOIs
    Publication statusPublished - 2017
    MoE publication typeA4 Article in a conference publication
    EventASME 2017 Pressure Vessels and Piping Conference, PVP 2017 - Waikoloa, United States
    Duration: 16 Jul 201720 Jul 2017

    Conference

    ConferenceASME 2017 Pressure Vessels and Piping Conference, PVP 2017
    CountryUnited States
    CityWaikoloa
    Period16/07/1720/07/17

    Fingerprint

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

    Keywords

    • low cycle fatigues
    • water
    • Pressurized water reactors

    Cite this

    Seppänen, T., Alhainen, J., Arilahti, E., & Solin, J. (2017). Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water. In ASME 2017 Pressure Vessels and Piping Conference (Vol. 1A). [PVP2017-65374] American Society of Mechanical Engineers ASME. https://doi.org/10.1115/PVP2017-65374
    Seppänen, Tommi ; Alhainen, Jouni ; Arilahti, Esko ; Solin, Jussi. / Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water. ASME 2017 Pressure Vessels and Piping Conference. Vol. 1A American Society of Mechanical Engineers ASME, 2017.
    @inproceedings{eb67756a0a164fae9dd17c09b71c2fdb,
    title = "Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water",
    abstract = "In order to perform design code (ASME III, RCC-M, JSME) compatible direct strain-controlled tests in simulated PWR water, a unique environmental fatigue testing facility was previously developed. Pneumatic bellows are used to generate strain in the stainless steel specimen mid-section, while eddy current based measurement is used as a feedback signal. The NUREG/CR-6909 report gathered a large database of test results and proposed environmental reduction factors (Fen) to account for a reduction in fatigue life in simulated LWR environment when comparing to a reference value in air. The database was composed of non-stabilized stainless steels tested using methods which are not directly comparable to those used in air to define the reference curves. Applicability of the stainless steel Fen factors has already been challenged in previous PVP papers (PVP2013-97500, PVP2014-28465, PVP2016-63294). Results in this paper continue to show this trend of lower experimental Fen factors compared to predictions made by the NUREG report. Dual strain rate tests were performed, specifically focusing on the effect of strain waveform shape on fatigue life. Similarly to last year's results (PVP2016-63294) a distinct effect of strain waveform, presently inadequately accounted for in Fen predictions, was observed.",
    keywords = "low cycle fatigues, water, Pressurized water reactors",
    author = "Tommi Sepp{\"a}nen and Jouni Alhainen and Esko Arilahti and Jussi Solin",
    year = "2017",
    doi = "10.1115/PVP2017-65374",
    language = "English",
    isbn = "978-0-7918-5790-8",
    volume = "1A",
    booktitle = "ASME 2017 Pressure Vessels and Piping Conference",
    publisher = "American Society of Mechanical Engineers ASME",
    address = "United States",

    }

    Seppänen, T, Alhainen, J, Arilahti, E & Solin, J 2017, Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water. in ASME 2017 Pressure Vessels and Piping Conference. vol. 1A, PVP2017-65374, American Society of Mechanical Engineers ASME, ASME 2017 Pressure Vessels and Piping Conference, PVP 2017, Waikoloa, United States, 16/07/17. https://doi.org/10.1115/PVP2017-65374

    Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water. / Seppänen, Tommi; Alhainen, Jouni; Arilahti, Esko; Solin, Jussi.

    ASME 2017 Pressure Vessels and Piping Conference. Vol. 1A American Society of Mechanical Engineers ASME, 2017. PVP2017-65374.

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

    TY - GEN

    T1 - Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water

    AU - Seppänen, Tommi

    AU - Alhainen, Jouni

    AU - Arilahti, Esko

    AU - Solin, Jussi

    PY - 2017

    Y1 - 2017

    N2 - In order to perform design code (ASME III, RCC-M, JSME) compatible direct strain-controlled tests in simulated PWR water, a unique environmental fatigue testing facility was previously developed. Pneumatic bellows are used to generate strain in the stainless steel specimen mid-section, while eddy current based measurement is used as a feedback signal. The NUREG/CR-6909 report gathered a large database of test results and proposed environmental reduction factors (Fen) to account for a reduction in fatigue life in simulated LWR environment when comparing to a reference value in air. The database was composed of non-stabilized stainless steels tested using methods which are not directly comparable to those used in air to define the reference curves. Applicability of the stainless steel Fen factors has already been challenged in previous PVP papers (PVP2013-97500, PVP2014-28465, PVP2016-63294). Results in this paper continue to show this trend of lower experimental Fen factors compared to predictions made by the NUREG report. Dual strain rate tests were performed, specifically focusing on the effect of strain waveform shape on fatigue life. Similarly to last year's results (PVP2016-63294) a distinct effect of strain waveform, presently inadequately accounted for in Fen predictions, was observed.

    AB - In order to perform design code (ASME III, RCC-M, JSME) compatible direct strain-controlled tests in simulated PWR water, a unique environmental fatigue testing facility was previously developed. Pneumatic bellows are used to generate strain in the stainless steel specimen mid-section, while eddy current based measurement is used as a feedback signal. The NUREG/CR-6909 report gathered a large database of test results and proposed environmental reduction factors (Fen) to account for a reduction in fatigue life in simulated LWR environment when comparing to a reference value in air. The database was composed of non-stabilized stainless steels tested using methods which are not directly comparable to those used in air to define the reference curves. Applicability of the stainless steel Fen factors has already been challenged in previous PVP papers (PVP2013-97500, PVP2014-28465, PVP2016-63294). Results in this paper continue to show this trend of lower experimental Fen factors compared to predictions made by the NUREG report. Dual strain rate tests were performed, specifically focusing on the effect of strain waveform shape on fatigue life. Similarly to last year's results (PVP2016-63294) a distinct effect of strain waveform, presently inadequately accounted for in Fen predictions, was observed.

    KW - low cycle fatigues

    KW - water

    KW - Pressurized water reactors

    UR - http://www.scopus.com/inward/record.url?scp=85034092128&partnerID=8YFLogxK

    U2 - 10.1115/PVP2017-65374

    DO - 10.1115/PVP2017-65374

    M3 - Conference article in proceedings

    AN - SCOPUS:85034092128

    SN - 978-0-7918-5790-8

    VL - 1A

    BT - ASME 2017 Pressure Vessels and Piping Conference

    PB - American Society of Mechanical Engineers ASME

    ER -

    Seppänen T, Alhainen J, Arilahti E, Solin J. Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water. In ASME 2017 Pressure Vessels and Piping Conference. Vol. 1A. American Society of Mechanical Engineers ASME. 2017. PVP2017-65374 https://doi.org/10.1115/PVP2017-65374