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Effects of moisture and mechanical loading on wooden materials

Mårtensson, Annika LU and Thelandersson, Sven LU (1990) In Wood Science and Technology 24(3). p.247-261
Abstract
In a previous paper (Mårtensson 1988 a), results of tests performed on hardboard in tension under cyclic humidity were presented and comparison with a suggested constitutive model was made. This paper presents the result of further work that has been carried out concerning modelling of the behaviour of tempered hardboard subjected to moisture loading combined with mechanical loading. Tests were made both in compression and bending. The tests in compression were of two types, conventional creep tests during moisture cycling and quasi-relaxation tests during moisture cycling. The model was quantified on the basis of the previous tension tests and the compression tests, in both cases creep tests, and was then checked independently against the... (More)
In a previous paper (Mårtensson 1988 a), results of tests performed on hardboard in tension under cyclic humidity were presented and comparison with a suggested constitutive model was made. This paper presents the result of further work that has been carried out concerning modelling of the behaviour of tempered hardboard subjected to moisture loading combined with mechanical loading. Tests were made both in compression and bending. The tests in compression were of two types, conventional creep tests during moisture cycling and quasi-relaxation tests during moisture cycling. The model was quantified on the basis of the previous tension tests and the compression tests, in both cases creep tests, and was then checked independently against the other types of test.

Interaction between moisture change and mechanical loading was found to be significant during the first moisture cycle but much smaller during subsequent cycles. Experimental and numerical analysis of composite structural elements was also performed, showing that internal stresses of significant magnitude are developed as a result of variations in moisture. Such stresses can be predicted with reasonable accuracy using the proposed model. This can be of great value in design and development of wood products and wooden structural elements. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
KstrWood
in
Wood Science and Technology
volume
24
issue
3
pages
247 - 261
publisher
Springer
external identifiers
  • Scopus:0009346530
ISSN
1432-5225
DOI
10.1007/BF01153558
language
English
LU publication?
yes
id
1d578ec0-f524-4f86-bae5-7a3abe923307 (old id 1698267)
date added to LUP
2010-10-22 15:12:27
date last changed
2016-10-13 04:44:18
@misc{1d578ec0-f524-4f86-bae5-7a3abe923307,
  abstract     = {In a previous paper (Mårtensson 1988 a), results of tests performed on hardboard in tension under cyclic humidity were presented and comparison with a suggested constitutive model was made. This paper presents the result of further work that has been carried out concerning modelling of the behaviour of tempered hardboard subjected to moisture loading combined with mechanical loading. Tests were made both in compression and bending. The tests in compression were of two types, conventional creep tests during moisture cycling and quasi-relaxation tests during moisture cycling. The model was quantified on the basis of the previous tension tests and the compression tests, in both cases creep tests, and was then checked independently against the other types of test.<br/><br>
Interaction between moisture change and mechanical loading was found to be significant during the first moisture cycle but much smaller during subsequent cycles. Experimental and numerical analysis of composite structural elements was also performed, showing that internal stresses of significant magnitude are developed as a result of variations in moisture. Such stresses can be predicted with reasonable accuracy using the proposed model. This can be of great value in design and development of wood products and wooden structural elements.},
  author       = {Mårtensson, Annika and Thelandersson, Sven},
  issn         = {1432-5225},
  keyword      = {KstrWood},
  language     = {eng},
  number       = {3},
  pages        = {247--261},
  publisher    = {ARRAY(0x87719d0)},
  series       = {Wood Science and Technology},
  title        = {Effects of moisture and mechanical loading on wooden materials},
  url          = {http://dx.doi.org/10.1007/BF01153558},
  volume       = {24},
  year         = {1990},
}