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Modelling of the hygroelastic behaviour of normal and compression wood tracheids
Uppsala University, Sweden.
Ecole Polytechnique Federale de Lausanne, Switzerland; Tetra Pak, Switzerland.
RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.ORCID-id: 0000-0001-7933-1811
Uppsala University, Sweden.
2014 (Engelska)Ingår i: Journal of Structural Biology, ISSN 1047-8477, E-ISSN 1095-8657, Vol. 185, nr 1, s. 89-98Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Compression wood conifer tracheids show different swelling and stiffness properties than those of usual normal wood, which has a practical function in the living plant: when a conifer shoot is moved from its vertical position, compression wood is formed in the under part of the shoot. The growth rate of the compression wood is faster than in the upper part resulting in a renewed horizontal growth. The actuating and load-carrying function of the compression wood is addressed, on the basis of its special ultrastructure and shape of the tracheids. As a first step, a quantitative model is developed to predict the difference of moisture-induced expansion and axial stiffness between normal wood and compression wood. The model is based on a state space approach using concentric cylinders with anisotropic helical structure for each cell-wall layer, whose hygroelastic properties are in turn determined by a self-consistent concentric cylinder assemblage of the constituent wood polymers. The predicted properties compare well with experimental results found in the literature. Significant differences in both stiffness and hygroexpansion are found for normal and compression wood, primarily due to the large difference in microfibril angle and lignin content. On the basis of these numerical results, some functional arguments for the reason of high microfibril angle, high lignin content and cylindrical structure of compression wood tracheids are supported.

Ort, förlag, år, upplaga, sidor
2014. Vol. 185, nr 1, s. 89-98
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-6474DOI: 10.1016/j.jsb.2013.10.014Scopus ID: 2-s2.0-84890990748Lokalt ID: 15478OAI: oai:DiVA.org:ri-6474DiVA, id: diva2:964312
Tillgänglig från: 2016-09-08 Skapad: 2016-09-08 Senast uppdaterad: 2023-06-08Bibliografiskt granskad

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