Effects of humidity changes on damping and stress relaxation in wood

Mechanical damping (tan delta) and stress relaxation on pine veneer samples under stepwise humidity changes were investigated. The loss factor shows a transient peak every time the relative humidity (RH) of the surrounding atmosphere is changed, The effect appears to be associated with the diffusion...

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Bibliographic Details
Published inJournal of materials science Vol. 28; no. 20; pp. 5668 - 5674
Main Authors EBRAHIMZADEH, P. R, KUBAT, D. G
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 1993
Subjects
Applied sciences
Exact sciences and technology
Polymer industry, paints, wood
Properties and testing
Wood
Wood. Paper. Non wovens
Veneer
Stress relaxation
Gymnospermae
Humidity
Mechanical properties
Coniferales
Spermatophyta
Softwood
Pinus
Experimental study
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Summary:Mechanical damping (tan delta) and stress relaxation on pine veneer samples under stepwise humidity changes were investigated. The loss factor shows a transient peak every time the relative humidity (RH) of the surrounding atmosphere is changed, The effect appears to be associated with the diffusion of water molecules into or out of the material, the peaks being observed both when the sample is humidified (5%-85% RH) or subjected to drying. The results are supplemented by stress relaxation data obtained on similar specimens. Also in this case a higher relaxation rate is observed when the RH level around the sample is changed, the total stress decrease after several cycles being significantly larger than the corresponding value observed after the same period at the higher RH level.
ISSN:0022-2461
1573-4803
1573-4803
DOI:10.1007/BF00367845