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Numerical simulation of hot-pressed veneer products: Moulding, spring-back and distortion
Technical University of Denmark.
2007 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 2, no 3-4, p. 130-137Article in journal (Refereed) Published
Abstract [en]

Customers demand a very a high quality of veneered furniture products with regard to surface appearance, shape stability and rigidity. To meet these requirements, it is important to improve the manufacturing process by a better understanding of the thermohydromechanical behaviour of the individual veneers. During the manufacture of strongly curved products, the veneers are exposed to large membrane and bending deformations and to a high pressure in the radial fibre direction. When hot-press forming is used, the veneers are also exposed to a high surface temperature during the pressing time (curing time). These severe conditions can result in plastic deformation perpendicular to the veneer surface as well as mechanosorptive strains in the curved regions, since the heating can significantly affect moisture distribution. How strong an influence these factors have on the distortion of the veneered product is far from being fully clarified. To study this complex multiphysical problem including temperature, moisture, large deformations for orthotropic materials, surface constraints and progressive glue interaction, a three-dimensional finite element simulation was performed. In this study, the simulation of deformations and stresses occurring during the manufacture of a curved veneered product (chair seat) of birch wood is described. The results show that heating, pressure and the fibre orientation in the veneers have a significant influence on the distortion of the chair seat.

Place, publisher, year, edition, pages
2007. Vol. 2, no 3-4, p. 130-137
Identifiers
URN: urn:nbn:se:ltu:diva-7353DOI: 10.1080/17480270801945355Local ID: 5bacfd50-83c5-480f-9d9c-a30e120be244OAI: oai:DiVA.org:ltu-7353DiVA, id: diva2:980242
Note
Upprättat; 2007; 20130910 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Sandberg, Dick

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