Improved Manufacturing Process for Bent and Laminated Wood Products of Beech: FE-modelling
2005 (English)In: Hardwood research and utilisation in Europe / [ed] Bejo, L., Sopron, 2005, 151-155 p.Conference paper (Refereed)
To make the development process for new laminated wood products more effective, there is need for a simulation tool based on a model of the wood material. With help from this tool the risk of fractures in the veneers, cracking in the wood or in the glue line will be estimated.
Wood is a complex hygroscopic material that is highly anisotropic, non-homogeneous, and strongly dependent on the loading rate. Most importantly, it is very sensitive for changes in temperature and moisture content. The material stiffness in the transversal directions is very low for wood and it is highly affected by changes in environmental conditions. During a manufacturing procedure of veneered products for curved furniture panels, the veneers are exposed to large membrane and bending deformations and high pressure in the radial fibre direction. When hot-press forming is used, the products are also exposed to high temperature on their surface. These hard conditions often result in large viscoelastic and elasto-plastic strains that have strong influence on the final quality of the product (spring-back, stiffness, distortion etc).
To be able to improve the manufacturing process the key issue is to understand the material behaviour during these severe conditions. The main scientific challenge is to establish a new thermal and moisture related elasto-plastic material model for non-linear and strongly orthotropic wood material behaviour. Based on this work a FE-model for analysing the whole forming procedure of the bended and laminated wood products is presented.
Place, publisher, year, edition, pages
Sopron, 2005. 151-155 p.
FEM, thermo-hydro-mechanical processing, wood, laminated bending, simulation, modelling, beech, birch, distortion
Research subject Technology (byts ev till Engineering), Forestry and Wood Technology
IdentifiersURN: urn:nbn:se:lnu:diva-20953OAI: oai:DiVA.org:lnu-20953DiVA: diva2:542407
The 2nd European Conference on Hardwood in Europe. September 6, Sopron, Hungary