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Moisture induced stresses and deformations in parquet floors : An experimental and numerical study

Blumer, Samuel; Niemz, Peter; Serrano, Erik LU and Gustafsson, Per Johan (2009) In Wood Research 54(1). p.89-101
Abstract
<p>The indoor climate in buildings has changed in the last decade due to more efficient climatic systems, floor heating systems and larger open floor areas with more natural light. All this has induced increasing ranges of relative humidity between different seasons. Also with decreasing relative humidity (in the winter 30-50% RH, in the summer 70-90% RH), floor-heating systems increase the temperature in wooden parquet planks for example. Such variations can result in troublesome deformations, delamination of the surface layer and development of cracks in the parquet flooring boards. Sometimes there is only deterioration of the appearance but the durability of the flooring system can also be reduced. Many laboratory tests have to be... (More)
<p>The indoor climate in buildings has changed in the last decade due to more efficient climatic systems, floor heating systems and larger open floor areas with more natural light. All this has induced increasing ranges of relative humidity between different seasons. Also with decreasing relative humidity (in the winter 30-50% RH, in the summer 70-90% RH), floor-heating systems increase the temperature in wooden parquet planks for example. Such variations can result in troublesome deformations, delamination of the surface layer and development of cracks in the parquet flooring boards. Sometimes there is only deterioration of the appearance but the durability of the flooring system can also be reduced. Many laboratory tests have to be done before reaching an optimal design of the parquet elements. Due to high coasts and time constraints of experiments, other supplementary research methods should be tested and evaluated. The articles' main objective was to increase understanding of the behaviour of parquet floors exposed to different climatic conditions using numerical calculation. The use of the finite element models provides options for design purposes of wood flooring systems. Several finite element models for adequate design have been created, tested and applied. After calibration and validation of the calculation method, parameter studies on the influence of material properties, geometry of the parquet floors and the long-term behaviour of the wood and glue line were performed. The results show a strong relation between material and geometry choice on the deformation, for example the gap opening and on the stress distribution in glue line, which can induce delamination of the surface layer and distortional effects of the parquet boards</p> (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Wood Research
volume
54
issue
1
pages
89 - 101
publisher
State Forest Products Research Inst
external identifiers
  • scopus:66249093127
ISSN
1336-4561
language
English
LU publication?
no
id
4ac64685-182a-45be-a76b-cbb922b041eb (old id 4770400)
date added to LUP
2014-11-07 14:09:08
date last changed
2017-01-01 06:07:30
@article{4ac64685-182a-45be-a76b-cbb922b041eb,
  abstract     = {&lt;p&gt;The indoor climate in buildings has changed in the last decade due to more efficient climatic systems, floor heating systems and larger open floor areas with more natural light. All this has induced increasing ranges of relative humidity between different seasons. Also with decreasing relative humidity (in the winter 30-50% RH, in the summer 70-90% RH), floor-heating systems increase the temperature in wooden parquet planks for example. Such variations can result in troublesome deformations, delamination of the surface layer and development of cracks in the parquet flooring boards. Sometimes there is only deterioration of the appearance but the durability of the flooring system can also be reduced. Many laboratory tests have to be done before reaching an optimal design of the parquet elements. Due to high coasts and time constraints of experiments, other supplementary research methods should be tested and evaluated. The articles' main objective was to increase understanding of the behaviour of parquet floors exposed to different climatic conditions using numerical calculation. The use of the finite element models provides options for design purposes of wood flooring systems. Several finite element models for adequate design have been created, tested and applied. After calibration and validation of the calculation method, parameter studies on the influence of material properties, geometry of the parquet floors and the long-term behaviour of the wood and glue line were performed. The results show a strong relation between material and geometry choice on the deformation, for example the gap opening and on the stress distribution in glue line, which can induce delamination of the surface layer and distortional effects of the parquet boards&lt;/p&gt;},
  author       = {Blumer, Samuel and Niemz, Peter and Serrano, Erik and Gustafsson, Per Johan},
  issn         = {1336-4561},
  language     = {eng},
  number       = {1},
  pages        = {89--101},
  publisher    = {State Forest Products Research Inst},
  series       = {Wood Research},
  title        = {Moisture induced stresses and deformations in parquet floors : An experimental and numerical study},
  volume       = {54},
  year         = {2009},
}