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Distortion in laminated veneer products exposed to relative-humidity variations: Experimental studies and finite-element modelling
Linnӕus University, Department of Building Technology, Växjö, Sweden. RISE, Research Institute of Sweden.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0002-4686-4010
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik. Department of Wood Processing and Biomaterials, Czech University of Life Sciences Prague, Prague, Czech Republic.ORCID-id: 0000-0002-4526-9391
2019 (engelsk)Inngår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 14, nr 2, s. 3768-3779Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
North Carolina State Univ Dept Wood & Paper Sci , 2019. Vol. 14, nr 2, s. 3768-3779
Emneord [en]
Birch, Cup, FEM, Veneer, Wood, Twist
HSV kategori
Forskningsprogram
Träteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-73340DOI: 10.15376/biores.14.2.3768-3779ISI: 000466449000091Scopus ID: 2-s2.0-85071081837OAI: oai:DiVA.org:ltu-73340DiVA, id: diva2:1299747
Merknad

Validerad;2019;Nivå 2;2019-04-10 (oliekm)

Tilgjengelig fra: 2019-03-28 Laget: 2019-03-28 Sist oppdatert: 2019-09-09bibliografisk kontrollert

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