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Experimental and numerical determination of the hygroscopic warping of cross-laminated solid wood panels

Gereke, Thomas; Gustafsson, Per-Johan LU ; Persson, Kent LU and Niemz, Peter (2009) In Holzforschung 63(3). p.340-347
Abstract
The moisture-induced warping of three-layered cross-laminated solid wood panels made of Norway spruce was studied. The panels were exposed to different climate conditions at 65% and 100% relative humidity at the two panel faces. The results showed increasing cup deformation with an increasing relative thickness of the outer layers. The annual growth ring orientation was found to have a significant influence on the magnitude of the cup deformation. Measurements and numerical simulations of the moisture distribution within the panel were made in order to provide data for numerical simulations of the warping. A distinctive moisture profile with a conspicuous influence of the adhesive bond lines was found. The coefficient of diffusion of the... (More)
The moisture-induced warping of three-layered cross-laminated solid wood panels made of Norway spruce was studied. The panels were exposed to different climate conditions at 65% and 100% relative humidity at the two panel faces. The results showed increasing cup deformation with an increasing relative thickness of the outer layers. The annual growth ring orientation was found to have a significant influence on the magnitude of the cup deformation. Measurements and numerical simulations of the moisture distribution within the panel were made in order to provide data for numerical simulations of the warping. A distinctive moisture profile with a conspicuous influence of the adhesive bond lines was found. The coefficient of diffusion of the adhesive bond lines was determined from the measurements and simulations. The mechanical material model used for the warping simulations takes into account elastic strain, moisture-induced swelling, and mechano-sorptive strain. The simulations showed good agreement with the warping test results. The most important material parameters for the cup deformation, which were identified in a parametric study of a panel with vertically oriented annual rings, are the moduli of elasticity and the swelling coefficients in the longitudinal and radial direction. Furthermore, the mechano-sorptive coefficient in radial direction was found to have a significant influence on warp. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
panel, moisture, cup, adhesive joint, cross-lamination, spruce (Picea, abies), warp
in
Holzforschung
volume
63
issue
3
pages
340 - 347
publisher
De Gruyter
external identifiers
  • wos:000266016900013
  • scopus:63849152895
ISSN
1437-434X
DOI
10.1515/HF.2009.061
language
English
LU publication?
yes
id
9df4e67f-4dc3-41d0-8064-52962940dfe0 (old id 1426077)
date added to LUP
2009-06-26 14:02:04
date last changed
2017-08-27 04:08:54
@article{9df4e67f-4dc3-41d0-8064-52962940dfe0,
  abstract     = {The moisture-induced warping of three-layered cross-laminated solid wood panels made of Norway spruce was studied. The panels were exposed to different climate conditions at 65% and 100% relative humidity at the two panel faces. The results showed increasing cup deformation with an increasing relative thickness of the outer layers. The annual growth ring orientation was found to have a significant influence on the magnitude of the cup deformation. Measurements and numerical simulations of the moisture distribution within the panel were made in order to provide data for numerical simulations of the warping. A distinctive moisture profile with a conspicuous influence of the adhesive bond lines was found. The coefficient of diffusion of the adhesive bond lines was determined from the measurements and simulations. The mechanical material model used for the warping simulations takes into account elastic strain, moisture-induced swelling, and mechano-sorptive strain. The simulations showed good agreement with the warping test results. The most important material parameters for the cup deformation, which were identified in a parametric study of a panel with vertically oriented annual rings, are the moduli of elasticity and the swelling coefficients in the longitudinal and radial direction. Furthermore, the mechano-sorptive coefficient in radial direction was found to have a significant influence on warp.},
  author       = {Gereke, Thomas and Gustafsson, Per-Johan and Persson, Kent and Niemz, Peter},
  issn         = {1437-434X},
  keyword      = {panel,moisture,cup,adhesive joint,cross-lamination,spruce (Picea,abies),warp},
  language     = {eng},
  number       = {3},
  pages        = {340--347},
  publisher    = {De Gruyter},
  series       = {Holzforschung},
  title        = {Experimental and numerical determination of the hygroscopic warping of cross-laminated solid wood panels},
  url          = {http://dx.doi.org/10.1515/HF.2009.061},
  volume       = {63},
  year         = {2009},
}