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Plasticity properties of thermally modified timber in bending: the effect of chemical changes during modification of European oak and Norway spruce.
Czech University of Life Sciences Prague (CULS).
Czech University of Life Sciences Prague (CULS).
Czech University of Life Sciences Prague (CULS), Technical University in Zvolen.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. (Träteknik)ORCID iD: 0000-0002-4526-9391
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2019 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 165, p. 613-625Article in journal (Refereed) Published
Abstract [en]

The plasticity of thermally modified European oak (Quercus robur L.) and f thermally modified Norway spruce (Picea abies Karst. (L.)) timber was evaluated in bending, and the plastic properties were related to the changes in chemical composition of the wood after modification. The objective was to gain new knowledge about the properties of materials in the plastic region of the force-deformation diagram in bending. A new software was developed (MATESS) and used to identify important characteristics of the material. This software eliminates shortcomings in current standards, such as simplifications in the evaluation of data when sufficiently sensitive measuring equipment is not available. The characteristics studied were: modulus of rupture (MOR), plastic potential (PP) chord modulus (CHM), the moduli of plasticity (EE), and the moduli of plasticity (EMV, EP). Extractives, lignin, cellulose, holocellulose, and hemicelluloses were analysed chemically to reveal the patterns that occur during the loading of the specimens. Thermal modification has different effects on the mechanical properties of oak and spruce, especially on CHM, EMV and EP, due to their different contents and structures of their chemical components. A strong correlation (r > 0.90) between hemicellulose content and MOR and Pp values was found for both species. The coefficients of determination indicated a very low dependence (r2 < 0.1) of MOR, PP, CHM, EE, EMV and EP, on the average density.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 165, p. 613-625
Keywords [en]
Chord modulus; Tangent modulus; Moduli of plasticity; Limit of proportionality; Middle value of plasticity; Modulus of rupture; Chemical analyses
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-72941DOI: 10.1016/j.compositesb.2019.02.019ISI: 000462803100056Scopus ID: 2-s2.0-85061626954OAI: oai:DiVA.org:ltu-72941DiVA, id: diva2:1289749
Note

Validerad;2019;Nivå 2;2019-02-25 (inah)

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-04-23Bibliographically approved

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