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Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.Axelsson, Ann Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. 2012 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 7, no 4, 4730-4743 p.Article in journal (Refereed) Published

Abstract [en] : Modulus of elasticity (MOE) in the tangential direction for Norway spruce, Picea abies (L.) H.Karst was measured. Test samples were tested in three-point bending, and moisture content (MC) and temperature were varied between the green condition and 7% MC and between 20°C and 80°C, respectively. An adjustment of measured MOE to the ideally tangential direction was made by using correction factors calculated from finite element simulations. The results show MOE and the gradients with respect to MC and temperature and how they vary with MC and temperature. The gradients are factors in gradient terms in the incremental stress-strain relation for linear elastic behaviour during load cycles where there are mechanical loads and at the same time varying MC and temperature. The gradient terms add to the temperature and MC expansion coefficients and may be of significant size for cases with high stress, high temperature and high MC.

Place, publisher, year, edition, pages: 2012. Vol. 7, no 4, 4730-4743 p.

Keyword [en] : Materials science - Other material science

Keyword [sv] : Teknisk materialvetenskap - Övrig teknisk materialvetenskap

National Category : Other Mechanical Engineering

Research subject: Wood Technology

Identifiers: URN: urn:nbn:se:ltu:diva-2628Local ID: 0448eb98-a1be-444c-a926-57bf74b4b777OAI: oai:DiVA.org:ltu-2628DiVA: diva2:975481

Note: Validerad; 2012; 20120807 (matse)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved



Autor: Ekevad, Mats

Fuente: http://ltu.diva-portal.org/







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