Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water

Tommi Seppänen; Jouni Alhainen; Esko Arilahti; Jussi Solin

doi:10.1115/PVP2017-65374

Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water

Tommi Seppänen, Jouni Alhainen, Esko Arilahti, Jussi Solin

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

6 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 language	English
Title of host publication	ASME 2017 Pressure Vessels and Piping Conference
Publisher	American Society of Mechanical Engineers (ASME)
Volume	1A
ISBN (Electronic)	978-0-7918-5790-8
ISBN (Print)	978-0-7918-5790-8
DOIs	https://doi.org/10.1115/PVP2017-65374
Publication status	Published - 2017
MoE publication type	A4 Article in a conference publication
Event	ASME 2017 Pressure Vessels and Piping Conference, PVP 2017 - Waikoloa, United States Duration: 16 Jul 2017 → 20 Jul 2017

Conference

Conference	ASME 2017 Pressure Vessels and Piping Conference, PVP 2017
Country/Territory	United States
City	Waikoloa
Period	16/07/17 → 20/07/17

Keywords

low cycle fatigues
water
Pressurized water reactors

Access to Document

10.1115/PVP2017-65374

Cite this

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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.",

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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 et al.
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 proceeding › Conference article in proceedings › Scientific › peer-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

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KW - Pressurized water reactors

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M3 - Conference article in proceedings

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VL - 1A

BT - ASME 2017 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME 2017 Pressure Vessels and Piping Conference, PVP 2017

Y2 - 16 July 2017 through 20 July 2017

ER -

Strain Waveform Effects for Low Cycle Fatigue in Simulated PWR Water

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