caa a22 4500 463227883 CHVBK 20180405153232.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10853-006-1199-9 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1199-9 Modelling of effects of ultrastructural morphology on the hygroelastic properties of wood fibres [Elektronische Daten] [R. Neagu, E. Gamstedt] Wood fibres constitute the structural framework of e.g. wood, paper, board and composites, where stiffness and dimensional stability are of importance. An analytical modelling approach has been used for prediction of hygroelastic response, and assessment of the stresses in thick-walled cylinder models of wood fibres. A wood fibre was idealised as a multilayered hollow cylinder made of orthotropic material with helical orientation. The hygroelastic response of the layered assembly due to axisymmetric loading and moisture content changes was obtained by solving the corresponding boundary value problem of elasticity. A simple solution scheme based on the state space approach and the transfer matrix method was employed. This was combined with an analytical ultrastructural homogenisation method, used to link hygroelastic properties of constituent wood polymers to properties of each layer. Predicted hygroelastic response captured experimentally measured behaviour. Fibres that were constrained not to twist showed a stiffer response than fibres allowed twisting under uniaxial loading. It was also shown that the ultrastructure, i.e. the microfibril angle, will control the hygroexpansion in the same way as it controls the compliance of the cell wall. Qualitative failure trends comparable with experimental observations could be established with stress analysis and a simple plane-stress failure criterion. Springer Science+Business Media, LLC, 2007 Neagu R. New Materials and Composites, STFI-Packforsk AB, Box 5604, 114 86, Stockholm, Sweden aut Gamstedt E. New Materials and Composites, STFI-Packforsk AB, Box 5604, 114 86, Stockholm, Sweden aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/24(2007-12-01), 10254-10274 0022-2461 42:24<10254 2007 42 10853 https://doi.org/10.1007/s10853-006-1199-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1199-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Neagu R. New Materials and Composites, STFI-Packforsk AB, Box 5604, 114 86, Stockholm, Sweden aut NATIONALLICENCE 700 1- Gamstedt E. New Materials and Composites, STFI-Packforsk AB, Box 5604, 114 86, Stockholm, Sweden aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/24(2007-12-01), 10254-10274 0022-2461 42:24<10254 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer