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Finite element simulation of growth stress formation and related board distortions resulting from sawing and forced drying
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Chalmers University of Technology, Sweden.ORCID iD: 0000-0001-5591-1045
Chalmers University of Technology, Sweden.
2006 (English)In: New Zealand Journal of Forestry Science, ISSN 0048-0134, E-ISSN 1179-5395, Vol. 36, no 2, 408-423 p.Article in journal (Refereed) Published
Abstract [en]

Matching timber quality with end-user requirements is a major research issue and lack of straightness in timber is the most frequent complaint worldwide. The final distortion of timber boards is caused mostly by moisture-related deformations and growth stresses that develop during growth of the tree, but how much the growth rate and growth stresses affect the final shape stability is not fully understood. A finite element analysis in which stress development during tree growth was simulated was performed with the aim of better understanding how growth stresses are generated. The tree growth model was formulated in terms of large strain settings (large changes in volume), whereas the material model for stress development was based on the theory of small strains. An earlier three-dimensional distortion model was developed further for studying the influence of growth stresses on final distortion of the board. The results showed that growth stresses clearly vary during tree growth and they also form a large stress gradient from pith to bark. This itself can result in significant bow and crook deformation when the log is sawed into boards.

Place, publisher, year, edition, pages
Springer, 2006. Vol. 36, no 2, 408-423 p.
Keyword [en]
tree growth, maturation strain, growth stress, wood, distortion
National Category
Paper, Pulp and Fiber Technology
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-41210OAI: oai:DiVA.org:lnu-41210DiVA: diva2:797565
Available from: 2015-03-24 Created: 2015-03-22 Last updated: 2016-05-03Bibliographically approved

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Ormarsson, Sigurdur
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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