Relaxation of OFP copper

    Research output: Book/ReportReport

    Abstract

    Oxygen-free phosphorus-doped (OFP) copper is a prime candidate outer shell (overpack) material to protect the spent fuel canisters against corrosion in the underground repository. As the canister and its copper shell are subject to internal heating by residual activity of the contents, it is possible that with sufficient loads or strains from e.g. thermal, handling or other sources shell will creep to some extent. In this work the isothermal uniaxial relaxation behaviour of OFP copper is considered from the point of view of basic relaxation modelling and experimental model validation. Validation is considered necessary before extending the modelled relaxation behaviour to multi-axial cases and finite element analysis (FEA) of the canister (overpack) details. The initial candidate relaxation models were selected for the expected performance at relatively low temperatures and likely tolerance of transients when implemented to FEA. The initial experiment however shows little difference between the selected models, and further testing appears necessary. Nevertheless, classical relaxation models appear to provide fair agreement with to the observed low temperature relaxation in OFP copper
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages12
    Publication statusPublished - 2014
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesVTT Research Report
    NumberVTT-R-00366-14

    Fingerprint

    phosphorus
    cans
    copper
    oxygen
    spent fuels
    corrosion
    heating

    Keywords

    • OFP copper
    • relaxation
    • modelling
    • testing
    • finite element analysis

    Cite this

    Auerkari, P., Pohja, R., Nurmela, A., & Rantala, J. (2014). Relaxation of OFP copper. Espoo: VTT Technical Research Centre of Finland. VTT Research Report, No. VTT-R-00366-14
    Auerkari, Pertti ; Pohja, Rami ; Nurmela, Asta ; Rantala, Juhani. / Relaxation of OFP copper. Espoo : VTT Technical Research Centre of Finland, 2014. 12 p. (VTT Research Report; No. VTT-R-00366-14).
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    title = "Relaxation of OFP copper",
    abstract = "Oxygen-free phosphorus-doped (OFP) copper is a prime candidate outer shell (overpack) material to protect the spent fuel canisters against corrosion in the underground repository. As the canister and its copper shell are subject to internal heating by residual activity of the contents, it is possible that with sufficient loads or strains from e.g. thermal, handling or other sources shell will creep to some extent. In this work the isothermal uniaxial relaxation behaviour of OFP copper is considered from the point of view of basic relaxation modelling and experimental model validation. Validation is considered necessary before extending the modelled relaxation behaviour to multi-axial cases and finite element analysis (FEA) of the canister (overpack) details. The initial candidate relaxation models were selected for the expected performance at relatively low temperatures and likely tolerance of transients when implemented to FEA. The initial experiment however shows little difference between the selected models, and further testing appears necessary. Nevertheless, classical relaxation models appear to provide fair agreement with to the observed low temperature relaxation in OFP copper",
    keywords = "OFP copper, relaxation, modelling, testing, finite element analysis",
    author = "Pertti Auerkari and Rami Pohja and Asta Nurmela and Juhani Rantala",
    year = "2014",
    language = "English",
    series = "VTT Research Report",
    publisher = "VTT Technical Research Centre of Finland",
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    Auerkari, P, Pohja, R, Nurmela, A & Rantala, J 2014, Relaxation of OFP copper. VTT Research Report, no. VTT-R-00366-14, VTT Technical Research Centre of Finland, Espoo.

    Relaxation of OFP copper. / Auerkari, Pertti; Pohja, Rami; Nurmela, Asta; Rantala, Juhani.

    Espoo : VTT Technical Research Centre of Finland, 2014. 12 p. (VTT Research Report; No. VTT-R-00366-14).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Relaxation of OFP copper

    AU - Auerkari, Pertti

    AU - Pohja, Rami

    AU - Nurmela, Asta

    AU - Rantala, Juhani

    PY - 2014

    Y1 - 2014

    N2 - Oxygen-free phosphorus-doped (OFP) copper is a prime candidate outer shell (overpack) material to protect the spent fuel canisters against corrosion in the underground repository. As the canister and its copper shell are subject to internal heating by residual activity of the contents, it is possible that with sufficient loads or strains from e.g. thermal, handling or other sources shell will creep to some extent. In this work the isothermal uniaxial relaxation behaviour of OFP copper is considered from the point of view of basic relaxation modelling and experimental model validation. Validation is considered necessary before extending the modelled relaxation behaviour to multi-axial cases and finite element analysis (FEA) of the canister (overpack) details. The initial candidate relaxation models were selected for the expected performance at relatively low temperatures and likely tolerance of transients when implemented to FEA. The initial experiment however shows little difference between the selected models, and further testing appears necessary. Nevertheless, classical relaxation models appear to provide fair agreement with to the observed low temperature relaxation in OFP copper

    AB - Oxygen-free phosphorus-doped (OFP) copper is a prime candidate outer shell (overpack) material to protect the spent fuel canisters against corrosion in the underground repository. As the canister and its copper shell are subject to internal heating by residual activity of the contents, it is possible that with sufficient loads or strains from e.g. thermal, handling or other sources shell will creep to some extent. In this work the isothermal uniaxial relaxation behaviour of OFP copper is considered from the point of view of basic relaxation modelling and experimental model validation. Validation is considered necessary before extending the modelled relaxation behaviour to multi-axial cases and finite element analysis (FEA) of the canister (overpack) details. The initial candidate relaxation models were selected for the expected performance at relatively low temperatures and likely tolerance of transients when implemented to FEA. The initial experiment however shows little difference between the selected models, and further testing appears necessary. Nevertheless, classical relaxation models appear to provide fair agreement with to the observed low temperature relaxation in OFP copper

    KW - OFP copper

    KW - relaxation

    KW - modelling

    KW - testing

    KW - finite element analysis

    M3 - Report

    T3 - VTT Research Report

    BT - Relaxation of OFP copper

    PB - VTT Technical Research Centre of Finland

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    ER -

    Auerkari P, Pohja R, Nurmela A, Rantala J. Relaxation of OFP copper. Espoo: VTT Technical Research Centre of Finland, 2014. 12 p. (VTT Research Report; No. VTT-R-00366-14).