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Internal stresses in the cross-grain direction in glulam induced by climate variations

Jönsson, Johan LU (2004) In Holzforschung 58(2). p.154-159
Abstract
Results are presented from an experimental investigation to determine internal stress states perpendicular to grain in glulam induced by moisture variations. The stresses are determined by measuring the released strains before and after cutting. Stress distributions are determined for specimens seasoned in constant humidity, specimens exposed to an artificial single climate change, specimens exposed to cyclic climate change and for specimens exposed to natural climate outdoors under shelter. Results for seasoned specimens show that internal stresses exist in glulam without the presence of moisture gradients. Stresses in specimens with an induced moisture gradient become larger when moistening from a specific climate A to another climate B... (More)
Results are presented from an experimental investigation to determine internal stress states perpendicular to grain in glulam induced by moisture variations. The stresses are determined by measuring the released strains before and after cutting. Stress distributions are determined for specimens seasoned in constant humidity, specimens exposed to an artificial single climate change, specimens exposed to cyclic climate change and for specimens exposed to natural climate outdoors under shelter. Results for seasoned specimens show that internal stresses exist in glulam without the presence of moisture gradients. Stresses in specimens with an induced moisture gradient become larger when moistening from a specific climate A to another climate B than when drying from B to A. Tests in an outdoor sheltered climate show large variations in strains and stresses. The tensile stress level in the inner part of the glulam cross section exceeds the characteristic strength of 0.5 MPa during a period of approximately 80 days. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
slicing, cross-grain direction, released deformation, contact free measuring technique, glulam, internal stress, moisture gradients, technique, KstrWood
in
Holzforschung
volume
58
issue
2
pages
154 - 159
publisher
De Gruyter
external identifiers
  • wos:000220368000009
  • scopus:1942473892
ISSN
1437-434X
DOI
10.1515/HF.2004.023
language
English
LU publication?
yes
id
9313db8f-758a-4ad6-bb3b-34b930b8d9da (old id 284663)
date added to LUP
2007-10-23 17:45:26
date last changed
2017-07-30 03:41:13
@article{9313db8f-758a-4ad6-bb3b-34b930b8d9da,
  abstract     = {Results are presented from an experimental investigation to determine internal stress states perpendicular to grain in glulam induced by moisture variations. The stresses are determined by measuring the released strains before and after cutting. Stress distributions are determined for specimens seasoned in constant humidity, specimens exposed to an artificial single climate change, specimens exposed to cyclic climate change and for specimens exposed to natural climate outdoors under shelter. Results for seasoned specimens show that internal stresses exist in glulam without the presence of moisture gradients. Stresses in specimens with an induced moisture gradient become larger when moistening from a specific climate A to another climate B than when drying from B to A. Tests in an outdoor sheltered climate show large variations in strains and stresses. The tensile stress level in the inner part of the glulam cross section exceeds the characteristic strength of 0.5 MPa during a period of approximately 80 days.},
  author       = {Jönsson, Johan},
  issn         = {1437-434X},
  keyword      = {slicing,cross-grain direction,released deformation,contact free measuring technique,glulam,internal stress,moisture gradients,technique,KstrWood},
  language     = {eng},
  number       = {2},
  pages        = {154--159},
  publisher    = {De Gruyter},
  series       = {Holzforschung},
  title        = {Internal stresses in the cross-grain direction in glulam induced by climate variations},
  url          = {http://dx.doi.org/10.1515/HF.2004.023},
  volume       = {58},
  year         = {2004},
}