Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation

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 mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.
    Original languageEnglish
    Pages (from-to)34-41
    JournalJournal of Nuclear Materials
    Volume465
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Nuclear fuel cladding
    nuclear fuels
    stress relaxation
    Stress relaxation
    Creep
    safety
    resources
    inclusions

    Keywords

    • Zircaloy-4
    • Cladding
    • Stress relaxation
    • Creep
    • Anelastic
    • Viscoelastic
    • Modelling

    Cite this

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    title = "Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation",
    abstract = "In fuel behaviour modelling accurate description of the cladding mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.",
    keywords = "Zircaloy-4, Cladding, Stress relaxation, Creep, Anelastic, Viscoelastic, Modelling",
    author = "Ville Tulkki and Timo Ikonen",
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    year = "2015",
    doi = "10.1016/j.jnucmat.2015.04.056",
    language = "English",
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    pages = "34--41",
    journal = "Journal of Nuclear Materials",
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    Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation. / Tulkki, Ville (Corresponding Author); Ikonen, Timo.

    In: Journal of Nuclear Materials, Vol. 465, 2015, p. 34-41.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Modelling anelastic contribution to nuclear fuel cladding creep and stress relaxation

    AU - Tulkki, Ville

    AU - Ikonen, Timo

    N1 - LIS: 24 embargo 3.6.2015-> tarkista Project code: 102531

    PY - 2015

    Y1 - 2015

    N2 - In fuel behaviour modelling accurate description of the cladding mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.

    AB - In fuel behaviour modelling accurate description of the cladding mechanical response is important for both operational and safety considerations. While accuracy is desired, a certain level of simplicity is needed as both computational resources and detailed information on properties of particular cladding may be limited. Most models currently used in the integral codes divide the mechanical response into elastic and viscoplastic contributions. These have difficulties in describing both creep and stress relaxation, and often separate models for the two phenomena are used. In this paper we implement anelastic contribution to the cladding mechanical model, thus enabling consistent modelling of both creep and stress relaxation. We show that the model based on assumption of viscoelastic behaviour can be used to explain several experimental observations in transient situations and compare the model to published set of creep and stress relaxation experiments performed on similar samples. Based on the analysis presented we argue that the inclusion of anelastic contribution to the cladding mechanical models provides a way to improve the simulation of cladding behaviour during operational transients.

    KW - Zircaloy-4

    KW - Cladding

    KW - Stress relaxation

    KW - Creep

    KW - Anelastic

    KW - Viscoelastic

    KW - Modelling

    U2 - 10.1016/j.jnucmat.2015.04.056

    DO - 10.1016/j.jnucmat.2015.04.056

    M3 - Article

    VL - 465

    SP - 34

    EP - 41

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

    SN - 0022-3115

    ER -