Modeling and verification of creep strain and exhaustion in a welded steam mixer

Stefan Holmström (Corresponding Author), Juhani Rantala, Anssi Laukkanen, Kari Kolari, Heikki Keinänen, Olli Lehtinen

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”
    Original languageEnglish
    Article number061405
    Number of pages6
    JournalJournal of Pressure Vessel Technology
    Volume131
    Issue number6
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Creep
    Steam
    ABAQUS
    Logistics
    Strain rate
    Nozzles
    Plastic deformation
    Materials properties
    Welds
    Finite element method
    Microstructure
    Steel

    Keywords

    • ProperTune

    Cite this

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    title = "Modeling and verification of creep strain and exhaustion in a welded steam mixer",
    abstract = "Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”",
    keywords = "ProperTune",
    author = "Stefan Holmstr{\"o}m and Juhani Rantala and Anssi Laukkanen and Kari Kolari and Heikki Kein{\"a}nen and Olli Lehtinen",
    year = "2009",
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    language = "English",
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    journal = "Journal of Pressure Vessel Technology",
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    publisher = "American Society of Mechanical Engineers ASME",
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    Modeling and verification of creep strain and exhaustion in a welded steam mixer. / Holmström, Stefan (Corresponding Author); Rantala, Juhani; Laukkanen, Anssi; Kolari, Kari; Keinänen, Heikki; Lehtinen, Olli.

    In: Journal of Pressure Vessel Technology, Vol. 131, No. 6, 061405, 2009.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Modeling and verification of creep strain and exhaustion in a welded steam mixer

    AU - Holmström, Stefan

    AU - Rantala, Juhani

    AU - Laukkanen, Anssi

    AU - Kolari, Kari

    AU - Keinänen, Heikki

    AU - Lehtinen, Olli

    PY - 2009

    Y1 - 2009

    N2 - Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”

    AB - Structures operating in the creep regime will consume their creep life at a greater rate in locations where the stress state is aggravated by triaxiality constraints. Many structures, such as the welded steam mixer studied here, also have multiple material zones differing in microstructure and material properties. The three-dimensional structure as such, in addition to interacting material zones, is a great challenge for finite element analysis (FEA), even to accurately pinpoint the critical locations where damage will be found. The studied steam mixer, made of 10CrMo 9-10 steel (P22), has after 100,000 h of service developed severe creep damage in several saddle point positions adjacent to nozzle welds. FE-simulation of long term behavior of this structure has been performed taking developing triaxiality constraints, material zones, and primary to tertiary creep regimes into account. The creep strain rate formulation is based on the logistic creep strain prediction model implemented to ABAQUS , including primary, secondary, and tertiary creep. The results are presented using a filtering technique utilizing the formulation of rigid plastic deformation for describing and quantifying the developing “creep exhaustion.”

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    JO - Journal of Pressure Vessel Technology

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