Experimentally verified model based predictions for integrity of copper overpack: Annual report 2017

    Research output: Book/ReportReport

    6 Downloads (Pure)

    Abstract

    In this annual report of the project “Experimentally verified model based predictions for integrity of copper overpack” (PRECO2017) the status of the experimental and modelling activities and results has been summarised up to the end of January 2018. The testing program and related activities have been continued and partly modified to support the assessment and verification of the long term integrity of the protective copper (Cu-OFP) overpack of the canister. To consider more discontinuous uniaxial behaviour, creep tests with stepwise increasing load and stress dips were conducted, and the results were compared with those from normal constant load creep testing. In general, the transients especially from stepwise increase in loading can consume a part of the deformation capacity and shorten creep (or creep-fatigue) life. The relaxation testing programme has continued with cyclic relaxation tests. The relaxation testing aims at developing a relaxation model for the FE calculation. It is expected that with the relaxation model the stress and strain distributions will be different when compared to the FE results with a traditional creep model only. The results of continuing multiaxial (notched bar) creep testing program suggest notch weakening, or life reduction by tensile multiaxiality. The 10.000h testing of a CT specimen from the modified welding (FSW) process with argon protective atmosphere is complete and the specimen is going to be investigated by metallography to study the behaviour of the oxide particles.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages17
    Publication statusPublished - 23 Mar 2018
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Research Report
    NumberVTT-R-01499-18

    Fingerprint

    Creep
    Creep testing
    Copper
    Testing
    Metallography
    Argon
    Loads (forces)
    Welding
    Fatigue of materials
    Protective atmospheres
    Oxides

    Keywords

    • creep
    • relaxation
    • copper
    • repository
    • life

    Cite this

    Rantala, J., Pohja, R., & Auerkari, P. (2018). Experimentally verified model based predictions for integrity of copper overpack: Annual report 2017. Espoo: VTT Technical Research Centre of Finland. VTT Research Report, No. VTT-R-01499-18
    Rantala, Juhani ; Pohja, Rami ; Auerkari, Pertti. / Experimentally verified model based predictions for integrity of copper overpack : Annual report 2017. Espoo : VTT Technical Research Centre of Finland, 2018. 17 p. (VTT Research Report; No. VTT-R-01499-18).
    @book{a5b76101daae43e2b12b8c65547bc8b0,
    title = "Experimentally verified model based predictions for integrity of copper overpack: Annual report 2017",
    abstract = "In this annual report of the project “Experimentally verified model based predictions for integrity of copper overpack” (PRECO2017) the status of the experimental and modelling activities and results has been summarised up to the end of January 2018. The testing program and related activities have been continued and partly modified to support the assessment and verification of the long term integrity of the protective copper (Cu-OFP) overpack of the canister. To consider more discontinuous uniaxial behaviour, creep tests with stepwise increasing load and stress dips were conducted, and the results were compared with those from normal constant load creep testing. In general, the transients especially from stepwise increase in loading can consume a part of the deformation capacity and shorten creep (or creep-fatigue) life. The relaxation testing programme has continued with cyclic relaxation tests. The relaxation testing aims at developing a relaxation model for the FE calculation. It is expected that with the relaxation model the stress and strain distributions will be different when compared to the FE results with a traditional creep model only. The results of continuing multiaxial (notched bar) creep testing program suggest notch weakening, or life reduction by tensile multiaxiality. The 10.000h testing of a CT specimen from the modified welding (FSW) process with argon protective atmosphere is complete and the specimen is going to be investigated by metallography to study the behaviour of the oxide particles.",
    keywords = "creep, relaxation, copper, repository, life",
    author = "Juhani Rantala and Rami Pohja and Pertti Auerkari",
    year = "2018",
    month = "3",
    day = "23",
    language = "English",
    series = "VTT Research Report",
    publisher = "VTT Technical Research Centre of Finland",
    number = "VTT-R-01499-18",
    address = "Finland",

    }

    Rantala, J, Pohja, R & Auerkari, P 2018, Experimentally verified model based predictions for integrity of copper overpack: Annual report 2017. VTT Research Report, no. VTT-R-01499-18, VTT Technical Research Centre of Finland, Espoo.

    Experimentally verified model based predictions for integrity of copper overpack : Annual report 2017. / Rantala, Juhani; Pohja, Rami; Auerkari, Pertti.

    Espoo : VTT Technical Research Centre of Finland, 2018. 17 p. (VTT Research Report; No. VTT-R-01499-18).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Experimentally verified model based predictions for integrity of copper overpack

    T2 - Annual report 2017

    AU - Rantala, Juhani

    AU - Pohja, Rami

    AU - Auerkari, Pertti

    PY - 2018/3/23

    Y1 - 2018/3/23

    N2 - In this annual report of the project “Experimentally verified model based predictions for integrity of copper overpack” (PRECO2017) the status of the experimental and modelling activities and results has been summarised up to the end of January 2018. The testing program and related activities have been continued and partly modified to support the assessment and verification of the long term integrity of the protective copper (Cu-OFP) overpack of the canister. To consider more discontinuous uniaxial behaviour, creep tests with stepwise increasing load and stress dips were conducted, and the results were compared with those from normal constant load creep testing. In general, the transients especially from stepwise increase in loading can consume a part of the deformation capacity and shorten creep (or creep-fatigue) life. The relaxation testing programme has continued with cyclic relaxation tests. The relaxation testing aims at developing a relaxation model for the FE calculation. It is expected that with the relaxation model the stress and strain distributions will be different when compared to the FE results with a traditional creep model only. The results of continuing multiaxial (notched bar) creep testing program suggest notch weakening, or life reduction by tensile multiaxiality. The 10.000h testing of a CT specimen from the modified welding (FSW) process with argon protective atmosphere is complete and the specimen is going to be investigated by metallography to study the behaviour of the oxide particles.

    AB - In this annual report of the project “Experimentally verified model based predictions for integrity of copper overpack” (PRECO2017) the status of the experimental and modelling activities and results has been summarised up to the end of January 2018. The testing program and related activities have been continued and partly modified to support the assessment and verification of the long term integrity of the protective copper (Cu-OFP) overpack of the canister. To consider more discontinuous uniaxial behaviour, creep tests with stepwise increasing load and stress dips were conducted, and the results were compared with those from normal constant load creep testing. In general, the transients especially from stepwise increase in loading can consume a part of the deformation capacity and shorten creep (or creep-fatigue) life. The relaxation testing programme has continued with cyclic relaxation tests. The relaxation testing aims at developing a relaxation model for the FE calculation. It is expected that with the relaxation model the stress and strain distributions will be different when compared to the FE results with a traditional creep model only. The results of continuing multiaxial (notched bar) creep testing program suggest notch weakening, or life reduction by tensile multiaxiality. The 10.000h testing of a CT specimen from the modified welding (FSW) process with argon protective atmosphere is complete and the specimen is going to be investigated by metallography to study the behaviour of the oxide particles.

    KW - creep

    KW - relaxation

    KW - copper

    KW - repository

    KW - life

    M3 - Report

    T3 - VTT Research Report

    BT - Experimentally verified model based predictions for integrity of copper overpack

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Rantala J, Pohja R, Auerkari P. Experimentally verified model based predictions for integrity of copper overpack: Annual report 2017. Espoo: VTT Technical Research Centre of Finland, 2018. 17 p. (VTT Research Report; No. VTT-R-01499-18).