Abstract
In this paper mechano-sorptive creep test results from twelve Norway spruce trees are presented. The wood material was well defined with respect to growth conditions, position in the tree and material parameters, such as annual ring width, slope of grain, knots, compression wood, density and modulus of elasticity. The influence of these parameters on the creep behaviour was studied. The creep tests were conducted in a climate room with varying relative humidity of 30%-90% and the duration of the creep tests was at least 100 days. For seven of the twelve studied trees there was a radial variation in relative creep between the pith and the bark. The specimens cut near the pith showed larger relative creep than the specimens cut near the bark. When all the 59 specimens included in this study were examined together, the modulus of elasticity seemed to be the best parameter, measured in this study, to predict the magnitude of relative creep. The correlations between relative creep and material parameters varied between the specimens from the different trees. Also the appearance of the creep curves varied between different specimens. Some specimens showed large variations in relative creep within the moisture cycles, some specimens did not at all seem to be sensible to moisture changes. The reason for these differences were not explained successfully in this study.
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