Visualising creep exhaustion in a P22 girth weld

Stefan Holmström, Anssi Laukkanen, Kim Calonius

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

    4 Citations (Scopus)

    Abstract

    For pipings creep damage will localized to locations with degraded microstructures aggravated by triaxiality constraints. These unfavorable conditions are known to be found in the heat affected zone of welds. The influence of triaxiality in a girth weld has been studied using a new "creep exhaustion" filtering technique named ?-filtering. It has been developed for FEM analysis purposes to localize critical regions for creep exhaustion in components. The creep ductility expression for rigid plastic deformation has been used for visualizing the level of creep exhaustion in a P22 girth weld. The creep response of a 3 zone girth weld was modeled with the logistic creep strain prediction method and l-filtered in Comsol software. For comparison some calculations were performed with the Norton law implemented Abaqus software. Preliminary results of the -filtering show that the regions in the weld that are critical according to experience (interface between heat affected zone and parent material) are indeed highlighted by the filtering method.
    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
    Pages208-221
    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

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    Keywords

    • ProperTune

    Cite this

    Holmström, S., Laukkanen, A., & Calonius, K. (2007). Visualising creep exhaustion in a P22 girth weld. In BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2 (pp. 208-221). VTT Technical Research Centre of Finland. VTT Symposium, No. 247