New interpretations of the Charpy V test

Kim Wallin, Päivi Karjalainen-Roikonen, Pasi Suikkanen

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

Abstract

Presently most structural integrity assessment procedures still allow the use of Charpy-V notch impact tests as a measure of fracture toughness. The use is generally made through some more or less reliable correlations between standard Charpy-V notch energy and fracture toughness or tearing resistance. Common for the present correlations is that very few studies have been made with respect to their usability to Ultra High Strength Steels (UHSS) with yield strengths in the excess of 900 MPa. This is the topic of this work. Focussing on novel directly quenched high performance steels, the applicability of the Master Curve methodology with special emphasis on the temperature dependence is examined and the validity of the standard T0-TCV28J transition temperature correlation is checked. Improvements to the criteria are proposed for further considerations. Additionally, a new simple procedure for converting sub-sized Charpy V data to full size specimens, that is in line with BS 7910, is presented. The new interpretations of the Charpy V test presented here enable an extension of present design rules like the ones in EN 1993-1-12 (2007) to steel strengths well beyond 1000 MPa. Providing a sufficient toughness for the steel is up to the steel manufacturer, but there is no basic reason why UHSS cannot be used based on an identical assessment procedure as for presently accepted steel strengths. Only 2 equations in EN 1993-1-12 (2007) needs to be changed, and the sub-size specimen conversion procedure needs to be adopted.
Original languageEnglish
Title of host publicationBaltica X
Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
EditorsPertti Auerkari
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages14
ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
Duration: 7 Jun 20169 Jun 2016

Publication series

NameVTT Technology
PublisherVTT
Volume261
ISSN (Electronic)2242-122X

Conference

ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
Abbreviated titleBaltica X
CountryFinland
CityHelsinki-Stockholm
Period7/06/169/06/16

Fingerprint

Steel
High strength steel
Fracture toughness
Structural integrity
Superconducting transition temperature
Toughness
Yield stress
Temperature

Cite this

Wallin, K., Karjalainen-Roikonen, P., & Suikkanen, P. (2016). New interpretations of the Charpy V test. In P. Auerkari (Ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants Espoo: VTT Technical Research Centre of Finland. VTT Technology, Vol.. 261
Wallin, Kim ; Karjalainen-Roikonen, Päivi ; Suikkanen, Pasi. / New interpretations of the Charpy V test. Baltica X: International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari. Espoo : VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).
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Wallin, K, Karjalainen-Roikonen, P & Suikkanen, P 2016, New interpretations of the Charpy V test. in P Auerkari (ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, Espoo, VTT Technology, vol. 261, BALTICA X - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 7/06/16.

New interpretations of the Charpy V test. / Wallin, Kim; Karjalainen-Roikonen, Päivi; Suikkanen, Pasi.

Baltica X: International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari. Espoo : VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).

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

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T1 - New interpretations of the Charpy V test

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N2 - Presently most structural integrity assessment procedures still allow the use of Charpy-V notch impact tests as a measure of fracture toughness. The use is generally made through some more or less reliable correlations between standard Charpy-V notch energy and fracture toughness or tearing resistance. Common for the present correlations is that very few studies have been made with respect to their usability to Ultra High Strength Steels (UHSS) with yield strengths in the excess of 900 MPa. This is the topic of this work. Focussing on novel directly quenched high performance steels, the applicability of the Master Curve methodology with special emphasis on the temperature dependence is examined and the validity of the standard T0-TCV28J transition temperature correlation is checked. Improvements to the criteria are proposed for further considerations. Additionally, a new simple procedure for converting sub-sized Charpy V data to full size specimens, that is in line with BS 7910, is presented. The new interpretations of the Charpy V test presented here enable an extension of present design rules like the ones in EN 1993-1-12 (2007) to steel strengths well beyond 1000 MPa. Providing a sufficient toughness for the steel is up to the steel manufacturer, but there is no basic reason why UHSS cannot be used based on an identical assessment procedure as for presently accepted steel strengths. Only 2 equations in EN 1993-1-12 (2007) needs to be changed, and the sub-size specimen conversion procedure needs to be adopted.

AB - Presently most structural integrity assessment procedures still allow the use of Charpy-V notch impact tests as a measure of fracture toughness. The use is generally made through some more or less reliable correlations between standard Charpy-V notch energy and fracture toughness or tearing resistance. Common for the present correlations is that very few studies have been made with respect to their usability to Ultra High Strength Steels (UHSS) with yield strengths in the excess of 900 MPa. This is the topic of this work. Focussing on novel directly quenched high performance steels, the applicability of the Master Curve methodology with special emphasis on the temperature dependence is examined and the validity of the standard T0-TCV28J transition temperature correlation is checked. Improvements to the criteria are proposed for further considerations. Additionally, a new simple procedure for converting sub-sized Charpy V data to full size specimens, that is in line with BS 7910, is presented. The new interpretations of the Charpy V test presented here enable an extension of present design rules like the ones in EN 1993-1-12 (2007) to steel strengths well beyond 1000 MPa. Providing a sufficient toughness for the steel is up to the steel manufacturer, but there is no basic reason why UHSS cannot be used based on an identical assessment procedure as for presently accepted steel strengths. Only 2 equations in EN 1993-1-12 (2007) needs to be changed, and the sub-size specimen conversion procedure needs to be adopted.

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CY - Espoo

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Wallin K, Karjalainen-Roikonen P, Suikkanen P. New interpretations of the Charpy V test. In Auerkari P, editor, Baltica X: International Conference on Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland. 2016. (VTT Technology, Vol. 261).