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

3 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",
year = "2016",
doi = "10.1115/PVP2016-63294",
language = "English",
isbn = "978-0-7918-5035-0",
volume = "1A",
booktitle = "ASME 2016 Pressure Vessels and Piping Conference",
publisher = "American Society of Mechanical Engineers ASME",
address = "United States",

}

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

TY - GEN

T1 - Direct strain-controlled variable strain rate low cycle fatigue testing in simulated PWR water

AU - Seppänen, Tommi

AU - Alhainen, Jouni

AU - Arilahti, Esko

AU - Solin, Jussi

PY - 2016

Y1 - 2016

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.

KW - alloy steel

KW - eddy current testing

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

U2 - 10.1115/PVP2016-63294

DO - 10.1115/PVP2016-63294

M3 - Conference article in proceedings

SN - 978-0-7918-5035-0

VL - 1A

BT - ASME 2016 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers ASME

ER -

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