Influence of strain rate, temperature and fatigue on the radial compression behaviour of Norway spruce

Carolina Moilanen, Tomas Björkqvist, Markus Ovaska, Juha Koivisto, Amandine Miksic, Birgitta A. Engberg, Lauri I. Salminen, Pentti Saarenrinne, Mikko Alava

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    4 Citations (Scopus)

    Abstract

    A dynamic elastoplastic compression model of Norway spruce for virtual computer optimization of mechanical pulping processes was developed. The empirical wood behaviour was fitted to a Voigt-Kelvin material model, which is based on quasi static compression and high strain rate compression tests (QSCT and HSRT, respectively) of wood at room temperature and at high temperature (80-100°C). The effect of wood fatigue was also included in the model. Wood compression stress-strain curves have an initial linear elastic region, a plateau region and a densification region. The latter was not reached in the HSRT. Earlywood (EW) and latewood (LW) contributions were considered separately. In the radial direction, the wood structure is layered and can well be modelled by serially loaded layers. The EW model was a two part linear model and the LW was modelled by a linear model, both with a strain rate dependent term. The model corresponds well to the measured values and this is the first compression model for EW and LW that is based on experiments under conditions close to those used in mechanical pulping.
    Original languageEnglish
    Pages (from-to)505-514
    Number of pages10
    JournalHolzforschung
    Volume71
    Issue number6
    DOIs
    Publication statusPublished - 2017
    MoE publication typeA1 Journal article-refereed

    Keywords

    • dynamic modelling of defibration
    • earlywood
    • high strain rate test
    • latewood
    • moist Norway spruce
    • radial compression behaviour
    • split-Hopkinson pressure bar
    • Voigt-Kelvin material model

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  • Cite this

    Moilanen, C., Björkqvist, T., Ovaska, M., Koivisto, J., Miksic, A., Engberg, B. A., Salminen, L. I., Saarenrinne, P., & Alava, M. (2017). Influence of strain rate, temperature and fatigue on the radial compression behaviour of Norway spruce. Holzforschung, 71(6), 505-514. https://doi.org/10.1515/hf-2016-0144