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Progress in the analysis of creep in wood during concurrent moisture changes

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Abstract

In analysing wood creep during moisture changes, various adjustments can be made to the data, including corrections for density and for dimensional changes. Provided that the variation of elastic compliance with moisture content is known, the elastic compliance can be separated from the total compliance to give a “reduced” creep compliance. Elastic compliance data can be formed into a graphical chart based on moisture content and the compliance at a single known moisture content. Good correlations have been obtained between reduced creep compliances for various modes of moisture change and the unloaded axial movement coefficientsβ L. Ifβ L could be considered as a measure of a number of internal “events”, related to hydrogen bonding, and taking place during moisture changes; then the number of these events might also be related to moisture-induced creep changes.

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Abbreviations

J :

compliance

J E :

elastic compliance

J R :

reduced compliance

J 0 :

elastic compliance of wood at 7% moisture content

dJ ++/du :

rate of change of compliance with moisture during humidification through moisture levels reached for the first time, after loading at low moisture content

dJ −−/du :

rate of change of compliance with moisture during dehumidification through moisture levels reached for the first time, after loading at high moisture content

dJ +/du :

rate of change of compliance with moisture during humidification at levels already previously reached since loading

dJ −/du :

rate of change of compliance with moisture during dehumidification at levels already previously reached since loading

u :

moisture content

β T :

unloaded movement coefficient in the tangential direction

βL:

unloaded movement coefficient in the longitudinal direction

θ :

mean microfibril angle of the S2 layer of the cell wall

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Authors and Affiliations

  1. Department of Mechanical and Production Engineering, Polytechnic of the South Bank, Borough Road, SE1, London, UK

    David G. Hunt & Christopher F. Shelton

Authors
  1. David G. Hunt
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  2. Christopher F. Shelton
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Hunt, D.G., Shelton, C.F. Progress in the analysis of creep in wood during concurrent moisture changes. J Mater Sci 22, 313–320 (1987). https://doi.org/10.1007/BF01160586

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  • DOI: https://doi.org/10.1007/BF01160586

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