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Journal of Materials Science

, Volume 42, Issue 24, pp 10254–10274 | Cite as

Modelling of effects of ultrastructural morphology on the hygroelastic properties of wood fibres

  • R. Cristian NeaguEmail author
  • E. Kristofer Gamstedt
Article

Abstract

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.

Keywords

Wood Fibre Cellulose Microfibril Pulp Fibre Cell Wall Layer State Space Approach 

Notes

Acknowledgments

Financial support from the Wood Ultrastructure Research Centre (WURC) and the research cluster “New Fibres for New Materials” at STFI-Packforsk AB the is gratefully acknowledged.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.New Materials and CompositesSTFI-Packforsk ABStockholmSweden
  2. 2.KTH Solid Mechanics, School of Engineering ScienceRoyal Institute of Technology (KTH)StockholmSweden

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