Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects

Gary Marquis, Jussi Solin

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


    Current fatigue design curves for NPP components are based largely on strain controlled tests of small specimens tested in air at room temperature. Reduction factors of 2 for strain or 20 for fatigue life are applied to the mean data and are intended to account for material, environment, surface finish and loading uncertainties. Pipe failures in recent years have been attributed to high cycle thermomechanical fatigue and have prompted re-evaluation of the fatigue design curves. Research has focussed especially on environmental effects and load sources. Some data also suggests that multiaxial loading and small stress cycles as part of a spectrum may cause significantly more fatigue damage than what is predicted. This paper examines some of these potential sources of fatigue damage.
    Original languageEnglish
    Title of host publicationPlant Life Management
    Subtitle of host publicationMidterm status of a R&D project
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    ISBN (Electronic)951-38-5728-X
    ISBN (Print)951-38-5727-1
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    EventPlant Life Management: Midterm status of a R&D project - Espoo, Finland
    Duration: 1 Jan 20011 Jan 2001

    Publication series

    SeriesVTT Symposium


    ConferencePlant Life Management


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