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Assessment of a Three-Dimensional Fiber Orientation Model for Timber
Linnaeus University, Faculty of Technology, Department of Building Technology.
Linnaeus University, Faculty of Technology, Department of Building Technology. (Träbyggteknik)
Linnaeus University, Faculty of Technology, Department of Building Technology.ORCID iD: 0000-0001-5319-4855
Linnaeus University, Faculty of Technology, Department of Building Technology. (Träbyggteknik)ORCID iD: 0000-0002-8513-0394
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2016 (English)In: Wood and Fiber Science, ISSN 0735-6161, Vol. 48, no 4, 271-290 p.Article in journal (Refereed) Published
Abstract [en]

Wood is an orthotropic material with very different properties along and across fibers, and every board has its own pattern of knots and fiber deviations. Therefore, detailed knowledge of the three-dimensional (3D) fiber orientation of individual boards would enable more accurate assessment of properties such as stiffness, strength, and shape stability. This paper presents a method for modeling 3D fiber orientation of side boards of Norway spruce. The method is based on dot laser scanning and utilization of the tracheid effect, and it is verified by a comparison between strain fields calculated on the basis of the fiber orientation model and corresponding strains determined using digital image correlation (DIC) technique. By means of the method, it is possible to identify knots and to reproduce the fiber orientation in clear wood in the vicinity of knots. Fiber orientation models of side boards including traversing edge knots were established and integrated in finite element models of boards used for simulation of four-point bending tests. The same boards were also tested in laboratory and displacement fields of the wide faces were recorded at different load levels using DIC technique. Comparisons of strain fields from measurements and simulations showed close agreement, regarding both strain patterns and strain levels. Local strain concentrations caused by very small defects were detected using the models and also found from the laboratory test results. The modeling approach may be used both to achieve improved accuracy of existing machine strength grading methods and, after further development, also for more advanced analysis of eg crack propagation and strength of timber.

Place, publisher, year, edition, pages
2016. Vol. 48, no 4, 271-290 p.
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-57467ISI: 000388430500006OAI: oai:DiVA.org:lnu-57467DiVA: diva2:1038708
Available from: 2016-10-19 Created: 2016-10-19 Last updated: 2016-12-15Bibliographically approved

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Hu, MinOlsson, AndersJohansson, MarieOscarsson, JanSerrano, Erik
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