Development of a spectrum method for modelling fatigue due to thermal mixing

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Turbulent mixing of cold and hot fluids can lead to high-cycle thermal fatigue in T-junctions. In this work, a spectrum method for the thermal fatigue modelling was further developed. Estimation of the reference frequency, which determines the frequency range of the temperature spectrum, was considered in particular by utilizing flow mixing data from two T-junctions. Fatigue and crack growth obtained with the method were compared with the sinusoidal (SIN) method and with a computational fluid dynamics (CFD) load. The reference frequency was determined by fitting the model spectrum with temperature spectra obtained from measurements and CFD simulations. A formula for the reference frequency was proposed, which can be used in approximating the frequency also for other flow conditions. The SIN method resulted in over-conservatism in the fatigue and crack growth assessment. Results from the spectrum method agreed quite well with those obtained with the CFD load, showing that the method could result in significant improvement over the SIN method
    Original languageEnglish
    Pages (from-to)136–146
    Number of pages11
    JournalNuclear Engineering and Design
    Volume331
    DOIs
    Publication statusPublished - 1 May 2018
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    fatigue
    Computational fluid dynamics
    Thermal fatigue
    Fatigue of materials
    Dynamic loads
    computational fluid dynamics
    Crack propagation
    thermal fatigue
    dynamic loads
    modeling
    cracks
    turbulent mixing
    crack
    Temperature
    Fluids
    Computer simulation
    frequency ranges
    Hot Temperature
    method
    cycles

    Keywords

    • thermal loads
    • turbulent mixing
    • thermal fatigue
    • crack growth

    Cite this

    @article{bbeaec0d7e124cb299f79394813aca94,
    title = "Development of a spectrum method for modelling fatigue due to thermal mixing",
    abstract = "Turbulent mixing of cold and hot fluids can lead to high-cycle thermal fatigue in T-junctions. In this work, a spectrum method for the thermal fatigue modelling was further developed. Estimation of the reference frequency, which determines the frequency range of the temperature spectrum, was considered in particular by utilizing flow mixing data from two T-junctions. Fatigue and crack growth obtained with the method were compared with the sinusoidal (SIN) method and with a computational fluid dynamics (CFD) load. The reference frequency was determined by fitting the model spectrum with temperature spectra obtained from measurements and CFD simulations. A formula for the reference frequency was proposed, which can be used in approximating the frequency also for other flow conditions. The SIN method resulted in over-conservatism in the fatigue and crack growth assessment. Results from the spectrum method agreed quite well with those obtained with the CFD load, showing that the method could result in significant improvement over the SIN method",
    keywords = "thermal loads, turbulent mixing, thermal fatigue, crack growth",
    author = "Antti Timperi",
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    language = "English",
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    Development of a spectrum method for modelling fatigue due to thermal mixing. / Timperi, Antti.

    In: Nuclear Engineering and Design, Vol. 331, 01.05.2018, p. 136–146.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Development of a spectrum method for modelling fatigue due to thermal mixing

    AU - Timperi, Antti

    PY - 2018/5/1

    Y1 - 2018/5/1

    N2 - Turbulent mixing of cold and hot fluids can lead to high-cycle thermal fatigue in T-junctions. In this work, a spectrum method for the thermal fatigue modelling was further developed. Estimation of the reference frequency, which determines the frequency range of the temperature spectrum, was considered in particular by utilizing flow mixing data from two T-junctions. Fatigue and crack growth obtained with the method were compared with the sinusoidal (SIN) method and with a computational fluid dynamics (CFD) load. The reference frequency was determined by fitting the model spectrum with temperature spectra obtained from measurements and CFD simulations. A formula for the reference frequency was proposed, which can be used in approximating the frequency also for other flow conditions. The SIN method resulted in over-conservatism in the fatigue and crack growth assessment. Results from the spectrum method agreed quite well with those obtained with the CFD load, showing that the method could result in significant improvement over the SIN method

    AB - Turbulent mixing of cold and hot fluids can lead to high-cycle thermal fatigue in T-junctions. In this work, a spectrum method for the thermal fatigue modelling was further developed. Estimation of the reference frequency, which determines the frequency range of the temperature spectrum, was considered in particular by utilizing flow mixing data from two T-junctions. Fatigue and crack growth obtained with the method were compared with the sinusoidal (SIN) method and with a computational fluid dynamics (CFD) load. The reference frequency was determined by fitting the model spectrum with temperature spectra obtained from measurements and CFD simulations. A formula for the reference frequency was proposed, which can be used in approximating the frequency also for other flow conditions. The SIN method resulted in over-conservatism in the fatigue and crack growth assessment. Results from the spectrum method agreed quite well with those obtained with the CFD load, showing that the method could result in significant improvement over the SIN method

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    KW - thermal fatigue

    KW - crack growth

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