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Micromechanical modelling of wood fibre composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2009 (English)In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 38, no 2, p. 118-123Article in journal (Refereed) Published
Abstract [en]

A concentric cylinder model for an N-phase composite with orthotropic properties of constituents was previously presented by the authors. With only minor modifications the model allows for including also free hygroexpansion terms in the elastic stress-strain relationship in order to deal with orthotropic phase swelling. Thus the effect of wood fibre ultrastructure and cell wall hygroelastic properties on wood fibre composite hygroexpansion may be analysed. Multiscale modelling was performed to calculate the hygroexpansion coefficients of both the fibre cell wall and the aligned wood fibre composite. Furthermore, the fibre's helical structure leads to an extension-twist coupling and thus a free fibre will deform axially and also rotate upon loading in longitudinal fibre direction. Within the composite, however, the fibre rotation will be restricted. Therefore, the decision was to compare the composite performance in the two extreme cases (i) free rotation (ii) no rotation of the fibre in the composite.

Place, publisher, year, edition, pages
2009. Vol. 38, no 2, p. 118-123
Keywords [en]
Technology - Chemical engineering
Keywords [sv]
Teknikvetenskap - Kemiteknik
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-7466DOI: 10.1179/174328909X387838ISI: 000265404200013Scopus ID: 2-s2.0-67649158349Local ID: 5da24720-1d32-11de-aa3f-000ea68e967bOAI: oai:DiVA.org:ltu-7466DiVA, id: diva2:980355
Note
Validerad; 2009; 20090330 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Marklund, ErikVarna, Janis

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