Statistical methods and database splitting for hcf data analysis

Géraud Blatman, Jean-Christophe Roux, Kim Wallin, Jussi Solin, Thomas Métais, Ertugrul Karabaki, Wolfgang Mayinger

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    2 Citations (Scopus)


    Fatigue curves are receiving nowadays an increased level of attention in the wake of experimental campaigns showing that the original ASME III mean air curve, also known as the Langer curve [1], does not represent accurately part of the recently obtained laboratory data. EDF, VTT and E.ON have been working towards a relevant fatigue assessment strategy. The three organizations recently exchanged HCF databases, providing a common benchmark to test and compare the various analysis methods. Following the 2014 PVP paper [2], several statistical approaches are being investigated. A special focus is given to methods able to properly account for run-out data points, which do not have the same statistical significance as failed data points. Besides, it has to be noted that only a limited number of material grades are used in NPP primary loop components and in each case, the material batches are identified and specified in de-tail. Therefore, a more accurate and relevant fatigue assessment might be obtained by splitting large datasets that generally mix various testing conditions and material grades. A comparison is made between a "mixed" approach and a "separated" one, in which the fatigue assessment is performed successively for two or more subsets, e.g. associated with two testing temperature ranges and/or steel grades. Both "mixed" and "separated" strategies are applied to the EDF and the E.ON databases containing fatigue data in different temperatures for non-stabilized and stabilized austenitic stainless steels. The resulting data scatters are compared and the significance of these statistical approaches to fatigue assessment is discussed.
    Original languageEnglish
    Title of host publicationASME 2016 Pressure Vessels and Piping Conference
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)978-0-7918-5036-7
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventASME 2016 Pressure Vessels and Piping Conference - Vancouver, Canada
    Duration: 17 Jul 201621 Jul 2016


    ConferenceASME 2016 Pressure Vessels and Piping Conference


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