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Distortion in laminated veneer products exposed to relative-humidity variations: experimental studies and finite-element modelling
Linnaeus University, Faculty of Technology, Department of Building Technology. RISE Research Institutes of Sweden, Sweden.ORCID iD: 0000-0001-8644-4099
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden;Czech University of Life Sciences Prague, Czech Republic.
2019 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 14, no 2, p. 3768-3779Article in journal (Refereed) Published
Abstract [en]

A shortcoming of the laminated bending process is that the product may become distorted after moulding. This study focused on the influence of fibre orientation deviation for individual veneers on the distortion of a moulded shell. The distortion of 90 cross-laminated shells of the same geometrical shape, consisting of seven peeled birch veneers, were studied under relative humidity variation. All the veneers were straight-grained in the longitudinal-tangential plane, but to simulate a deviation in fibre orientation, some of the individual veneers were oriented at an angle of 7° relative to the main orientation of the other veneers in the laminate. A finite element model (FEM) was applied to study the possibility of predicting the results of a practical experiment. The study confirms the well-known fact that deviation in fibre orientation influences shape stability. The results also show how the placement of the abnormal veneer influences the degree of distortion. From this basic knowledge, some improvements in the industrial production were suggested. However, the FE model significantly underestimated the results, according to the empirical experiment, and it did not show full coherence. The survey shows the complexity of modelling the behaviour of laminated veneer products under changing climate conditions and that there is a great need to improve the material and process data to achieve accurate simulations. Examples of such parameters that may lead to distortion are density, annual ring orientation in the cross section of the veneer, the orientation of the loose and tight sides of the veneer, and parameters related to the design of the moulding tool.

Place, publisher, year, edition, pages
Raleigh, NC: North Carolina State University , 2019. Vol. 14, no 2, p. 3768-3779
Keywords [en]
Birch, Cup, FEM, Veneer, Wood, Twist
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-81623ISI: 000466449000091OAI: oai:DiVA.org:lnu-81623DiVA, id: diva2:1301956
Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-05-28Bibliographically approved

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Blomqvist, Lars

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