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Prediction of timber bending strength on basis of bending stiffness and material homogeneity assessed from dynamic excitation
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggnadsteknik)
SP Technical Research Institute of Sweden, Videum Science Park, 351 96, Växjö, Sweden. (Träbyggnadsteknik)ORCID iD: 0000-0002-8513-0394
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggnadsteknik)ORCID iD: 0000-0001-5319-4855
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggnadsteknik)
2012 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 46, no 4, 667-683 p.Article in journal (Refereed) Published
Abstract [en]

The potential of utilizing resonance frequencies corresponding to edgewise bending modes for predicting the bending strength of timber is investigated. The research includes measurements of axial and transversal resonance frequencies, laboratory assessment of density, static bending stiffness and bending strength of 105 boards of Norway spruce of dimensions 45×145×3600 mm. It is shown that Eb,1, (MOE based on the resonance frequency of the first bending mode) gives a higher coefficient of determination to the bending strength than what Ea,1 (MOE based on the first axial resonance frequency) does. It is also shown that resonance frequencies corresponding to higher bending modes can be used in the definition of a new indicating property, the measure of inhomogeneity (MOI). This is a scalar value representing the lack of fit between the true, measured resonance frequencies and the expected (assuming homogeneity) resonance frequencies of a board. The results show that using the MOI as a third indicating property, in addition to Eb,1 and density, increases the coefficient of determination with respect to bending strength from R2=0.69 to R2=0.75.

Place, publisher, year, edition, pages
2012. Vol. 46, no 4, 667-683 p.
Keyword [en]
Machine strength grading, Bending mode, Dynamic excitation, Resonance frequency, Wood, MOE, Measure of inhomogeneity, Finite element method
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-10645DOI: 10.1007/s00226-011-0427-xOAI: oai:DiVA.org:lnu-10645DiVA: diva2:395895
Available from: 2011-02-08 Created: 2011-02-08 Last updated: 2016-12-15Bibliographically approved

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Olsson, AndersOscarsson, JanJohansson, MarieKällsner, Bo
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CiteExportLink to record
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