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Stress distribution in veneers under lamination and simultaneously bending: an experimental and numerical investigation
RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.ORCID iD: 0000-0001-8644-4099
Linnaeus University, Sweden.
RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.ORCID iD: 0009-0006-5013-9942
2023 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 18, no 3, p. 995-1002Article in journal (Refereed) Published
Abstract [en]

Laminated veneer products (LVPs) are veneers glued together into a predetermined shape. Experimental and numerical investigations were performed under lamination and simultaneously bending of veneer laminate to study the stress distribution in the laminate. Laminates of different thicknesses were made of peeled veneers of European beech. The veneers were coated with adhesive, inserted in a mould which had the shape of a semicircle, and finally pressed at 20°C to a laminate. Two Teflon-polymer films including sensors for measurement of the contact pressure were placed on both sides of the laminate to measure the local contact pressure (contact stress) between the laminate and the mould. At the beginning of the bending process, the contact stresses were locally distributed over the laminate in a similar pattern as in a three-point bending; after the laminate was further bent, the stress distribution rearranged to be as in four-point bending. In the end of the moulding, the local contact stresses increased over the entire laminate and reached a ‘peak-value’ over bent area in the middle part of the mould. A finite-element model was created to study the bending process. Regarding the overall development of the contact stress variations, the experimental and the numerical results agreed.

Place, publisher, year, edition, pages
2023. Vol. 18, no 3, p. 995-1002
Keywords [en]
Wood, European beech, veneer-sheet moulding, FE-modelling, contact pressure
National Category
Wood Science
Identifiers
URN: urn:nbn:se:ri:diva-59881DOI: 10.1080/17480272.2022.2099762OAI: oai:DiVA.org:ri-59881DiVA, id: diva2:1686098
Projects
Förutsägande av prestanda i en biobaserad produkt
Funder
Vinnova, 2019-00780Swedish Energy AgencySwedish Research Council Formas
Note

Financial support from Produktion2030, a strategic innovation program supported by VINNOVA [reference number: 2019-00780], Swedish Energy Agency, Formas and the industry is acknowledged with gratitude.

Available from: 2022-08-08 Created: 2022-08-08 Last updated: 2025-09-23Bibliographically approved

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Blomqvist, LarsZiethén, Rune

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