Fatigue treatment of wood by high-frequency cyclic loading

S. Panula-Ontto, Mikael Lucander, Sari Asikainen, Tiina Pöhler, Erkki Saharinen, T. Björkqvist

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

    13 Citations (Scopus)


    A new tool was used for investigating the qualitative and the quantitative response of wood at high static pressure superposed with a modulated cyclic loading. Wood samples were cyclically stressed with large compression pulses and at frequencies in the range 100-1000 Hz, i.e., at frequencies close to those used in production scale mechanical pulping. The temperature rise in the wood was measured both with thermocouples inserted into the wood and also with a thermographic camera. It was found that a high static load during cyclic loading increased heat generation in the wood. The cyclic loading frequency had less effect than the level of the static loading. However, low frequencies generated more heat after a specific number of impacts. The wood underwent irreversible plastic deformations accompanied by heat generation and increased pore volume in the wood fibre wall microstructure.
    Original languageEnglish
    Title of host publicationProceedings of a meeting held 6-9 May 2007, Minneapolis, Minnesota
    PublisherTAPPI Press
    Number of pages7
    ISBN (Print)978-1-60560293-6
    Publication statusPublished - 2007
    MoE publication typeA4 Article in a conference publication
    EventInternational Mechanical Pulping Conference, IMPC 2007 - Minneapolis, United States
    Duration: 6 May 20079 May 2007


    ConferenceInternational Mechanical Pulping Conference, IMPC 2007
    Country/TerritoryUnited States


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