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Using homogenization and nanoindentation for microfibril angle determination of spruce

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    0507121 - ÚTAM 2020 RIV CZ eng C - Conference Paper (international conference)
    Kucíková, L. - Hrbek, Vladimír - Vorel, J. - Šejnoha, M.
    Using homogenization and nanoindentation for microfibril angle determination of spruce.
    Acta Polytechnica CTU Proceedings. Vol. 13. Prague: Czech Technical University in Prague, 2017 - (Padevět, P.), s. 71-74. ISBN 978-80-01-06346-0. E-ISSN 2336-5382.
    [NMM 2017 - Nano and Macro Mechanics Conference /8./. Prague (CZ), 21.09.2017-21.09.2017]
    Institutional support: RVO:68378297
    Keywords : spruce * nanoindentation * microfibril angle * homogenization
    OECD category: Paper and wood
    https://doi.org/10.14311/APP.2017.13.0071

    This paper is concerned with the evaluation of microfibril angle of spruce. The microfibril angle is defined as an inclination of microfibrils from the longitudinal axis, the direction of lumens. It is well known and further supported by the present study that the microfibril angle has a great influence on the final mechanical properties of wood. This angle could be measured either directly using, e.g. polarisation microscopy, X-ray diffraction, infrared spectroscopy, or indirectly, as used in this study, by employing the nanoindentation measurements. Therein, the measured indentation modulus is compared with that obtained numerically using the anisotropic theory of indentation. The latter one depends on the entire stiffness matrix derived through homogenization and the searched microfibril angle. In view of the cell wall microstructure, the effective cell properties were found using the two-step micromechanical homogenization adopting both the Self-consistent and Mori-Tanaka methods.
    Permanent Link: http://hdl.handle.net/11104/0298182

     
     
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