The LICON approach to life management

Juhani Rantala, Pertti Auerkari, S.R. Holdsworth, R.C. Hurst

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

The prediction of long-term high-temperature material properties is difficult when the prediction is based on normal short to medium-term uniaxial creep test results. The test acceleration achieved by increasing either test temperature or stress or both, easily leads to deformation mechanism changes, which makes the prediction unreliable. In a short-term uniaxial laboratory test it is impossible to produce the same type of creep damage as observed in power plant components which have been in operation for more than 100 000 hours. An alternative method has been proposed based on using multiaxial test specimens. This concept was tested in the LICON project (BE95-3019, 1996-2001), where the theoretical basis of the method was developed and verified experimentally for three steels in base material and welded condition by using several different multiaxial laboratory specimens and full-size test components. A typical test campaigne required to apply the methodology is a series of creep crack growth tests on standard CT specimens to 0.5 mm crack extension and test durations between 1.000 and 10.000 hours. A comprehensive Code of Practice document was produced in the project, and this will be published later in 2007.
Original languageEnglish
Title of host publicationBALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages222-234
ISBN (Electronic)978-951-38-6318-0
ISBN (Print)978-951-38-6317-3
Publication statusPublished - 2007
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 12 Jun 200714 Jun 2007

Publication series

SeriesVTT Symposium
Number247
ISSN0357-9387

Conference

ConferenceBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period12/06/0714/06/07

Fingerprint

Creep
Crack propagation
Materials properties
Power plants
Cracks
Temperature
Steel

Cite this

Rantala, J., Auerkari, P., Holdsworth, S. R., & Hurst, R. C. (2007). The LICON approach to life management. In BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2 (pp. 222-234). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 247
Rantala, Juhani ; Auerkari, Pertti ; Holdsworth, S.R. ; Hurst, R.C. / The LICON approach to life management. BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2007. pp. 222-234 (VTT Symposium; No. 247).
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Rantala, J, Auerkari, P, Holdsworth, SR & Hurst, RC 2007, The LICON approach to life management. in BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 247, pp. 222-234, BALTICA VII - International Conference on Life Management and Main-tenance for Power Plants, Helsinki-Stockholm, Finland, 12/06/07.

The LICON approach to life management. / Rantala, Juhani; Auerkari, Pertti; Holdsworth, S.R.; Hurst, R.C.

BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. Espoo : VTT Technical Research Centre of Finland, 2007. p. 222-234 (VTT Symposium; No. 247).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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N2 - The prediction of long-term high-temperature material properties is difficult when the prediction is based on normal short to medium-term uniaxial creep test results. The test acceleration achieved by increasing either test temperature or stress or both, easily leads to deformation mechanism changes, which makes the prediction unreliable. In a short-term uniaxial laboratory test it is impossible to produce the same type of creep damage as observed in power plant components which have been in operation for more than 100 000 hours. An alternative method has been proposed based on using multiaxial test specimens. This concept was tested in the LICON project (BE95-3019, 1996-2001), where the theoretical basis of the method was developed and verified experimentally for three steels in base material and welded condition by using several different multiaxial laboratory specimens and full-size test components. A typical test campaigne required to apply the methodology is a series of creep crack growth tests on standard CT specimens to 0.5 mm crack extension and test durations between 1.000 and 10.000 hours. A comprehensive Code of Practice document was produced in the project, and this will be published later in 2007.

AB - The prediction of long-term high-temperature material properties is difficult when the prediction is based on normal short to medium-term uniaxial creep test results. The test acceleration achieved by increasing either test temperature or stress or both, easily leads to deformation mechanism changes, which makes the prediction unreliable. In a short-term uniaxial laboratory test it is impossible to produce the same type of creep damage as observed in power plant components which have been in operation for more than 100 000 hours. An alternative method has been proposed based on using multiaxial test specimens. This concept was tested in the LICON project (BE95-3019, 1996-2001), where the theoretical basis of the method was developed and verified experimentally for three steels in base material and welded condition by using several different multiaxial laboratory specimens and full-size test components. A typical test campaigne required to apply the methodology is a series of creep crack growth tests on standard CT specimens to 0.5 mm crack extension and test durations between 1.000 and 10.000 hours. A comprehensive Code of Practice document was produced in the project, and this will be published later in 2007.

M3 - Conference article in proceedings

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Rantala J, Auerkari P, Holdsworth SR, Hurst RC. The LICON approach to life management. In BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2. Espoo: VTT Technical Research Centre of Finland. 2007. p. 222-234. (VTT Symposium; No. 247).