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

    Keywords

    • low cycle fatigues
    • water
    • Pressurized water reactors

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  • 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