Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water

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

2 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.
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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.",
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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

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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.

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BT - ASME 2017 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers ASME

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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