Viscoelastic modeling of Zircaloy cladding in-pile transient creep

Ville Tulkki (Corresponding Author), Timo Ikonen

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    Abstract

    In fuel behaviour modelling accurate description of the cladding stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.
    Original languageEnglish
    Pages (from-to)324 - 329
    JournalJournal of Nuclear Materials
    Volume457
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    piles
    Piles
    Creep
    strain hardening
    pellets
    transient loads
    Strain hardening
    creep tests
    viscoelasticity
    safety
    recovery
    Viscoelasticity
    engineering
    formulations
    Contacts (fluid mechanics)
    expansion
    Gases
    gases
    Recovery
    Experiments

    Keywords

    • zircaloy
    • creep
    • stress transient
    • standard linear solid
    • viscoelastic

    Cite this

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    title = "Viscoelastic modeling of Zircaloy cladding in-pile transient creep",
    abstract = "In fuel behaviour modelling accurate description of the cladding stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.",
    keywords = "zircaloy, creep, stress transient, standard linear solid, viscoelastic",
    author = "Ville Tulkki and Timo Ikonen",
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    Viscoelastic modeling of Zircaloy cladding in-pile transient creep. / Tulkki, Ville (Corresponding Author); Ikonen, Timo.

    In: Journal of Nuclear Materials, Vol. 457, 2015, p. 324 - 329.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Viscoelastic modeling of Zircaloy cladding in-pile transient creep

    AU - Tulkki, Ville

    AU - Ikonen, Timo

    N1 - Project code: 81655

    PY - 2015

    Y1 - 2015

    N2 - In fuel behaviour modelling accurate description of the cladding stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.

    AB - In fuel behaviour modelling accurate description of the cladding stress response is important for both operational and safety considerations. The cladding creep determines in part the width of the gas gap, the duration to pellet-cladding contact and the stresses to the cladding due to the pellet expansion. Conventionally the strain hardening rule has been used to describe the creep response to transient loads in engineering applications. However, it has been well documented that the strain hardening rule does not describe well results of tests with load drops or reversals. In our earlier work we have developed a model for primary creep which can be used to simulate the in- and out-of-pile creep tests. Since then several creep experiments have entered into public domain. In this paper we develop the model formulation based on the theory of viscoelasticity, and show that this model can reproduce the new experimental results. We also show that the creep strain recovery encountered in experimental measurements can be explained by viscoelastic behaviour.

    KW - zircaloy

    KW - creep

    KW - stress transient

    KW - standard linear solid

    KW - viscoelastic

    U2 - 10.1016/j.jnucmat.2014.11.100

    DO - 10.1016/j.jnucmat.2014.11.100

    M3 - Article

    VL - 457

    SP - 324

    EP - 329

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

    SN - 0022-3115

    ER -