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The effect of moisture gradients on tensile strength perpendicular to grain in glulam

Jönsson, Johan LU and Thelandersson, Sven LU (2003) In European Journal of Wood and Wood Products 61(5). p.342-348
Abstract
Experimental results are presented concerning tension perpendicular to grain in glulam sections where internal stresses induced by climate changes are present. The results reveal that moisture induced internal stresses may affect the tension capacity both in a positive and a negative way compared to reference specimens, free from moisture gradients. The tension capacity is reduced during moistening from RH 40% up to RH 80% whereas it is increased during drying from RH 80% to 40%. The tension capacity during wetting is only 50% of that observed for drying specimens. This behaviour can be explained by the combination between initial moisture induced stresses and stresses from external loading. The same tendency was observed for specimens... (More)
Experimental results are presented concerning tension perpendicular to grain in glulam sections where internal stresses induced by climate changes are present. The results reveal that moisture induced internal stresses may affect the tension capacity both in a positive and a negative way compared to reference specimens, free from moisture gradients. The tension capacity is reduced during moistening from RH 40% up to RH 80% whereas it is increased during drying from RH 80% to 40%. The tension capacity during wetting is only 50% of that observed for drying specimens. This behaviour can be explained by the combination between initial moisture induced stresses and stresses from external loading. The same tendency was observed for specimens exposed to cyclic climate changes, where it was also found that time and numbers of cycles do not affect the tension capacity in any specific direction. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Journal of Wood and Wood Products
volume
61
issue
5
pages
342 - 348
publisher
Springer
external identifiers
  • wos:000185810100003
  • scopus:17544399871
ISSN
0018-3768
DOI
10.1007/s00107-003-0405-6
language
English
LU publication?
yes
id
54fcb680-1506-48c1-904e-70ab4376f07a (old id 298690)
date added to LUP
2007-09-13 14:39:11
date last changed
2017-08-20 03:36:17
@article{54fcb680-1506-48c1-904e-70ab4376f07a,
  abstract     = {Experimental results are presented concerning tension perpendicular to grain in glulam sections where internal stresses induced by climate changes are present. The results reveal that moisture induced internal stresses may affect the tension capacity both in a positive and a negative way compared to reference specimens, free from moisture gradients. The tension capacity is reduced during moistening from RH 40% up to RH 80% whereas it is increased during drying from RH 80% to 40%. The tension capacity during wetting is only 50% of that observed for drying specimens. This behaviour can be explained by the combination between initial moisture induced stresses and stresses from external loading. The same tendency was observed for specimens exposed to cyclic climate changes, where it was also found that time and numbers of cycles do not affect the tension capacity in any specific direction.},
  author       = {Jönsson, Johan and Thelandersson, Sven},
  issn         = {0018-3768},
  language     = {eng},
  number       = {5},
  pages        = {342--348},
  publisher    = {Springer},
  series       = {European Journal of Wood and Wood Products},
  title        = {The effect of moisture gradients on tensile strength perpendicular to grain in glulam},
  url          = {http://dx.doi.org/10.1007/s00107-003-0405-6},
  volume       = {61},
  year         = {2003},
}