An investigation of the influence of selected factors on the properties of spruce wood |
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Authors: | Walter Sonderegger Daniel Mandallaz Peter Niemz |
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Institution: | (1) Department of Civil, Environmental and Geomatic Engineering, Institute for Building Materials, ETH Zurich, 8093 Zurich, Switzerland;(2) Department of Environmental Sciences, Institute of Terrestrial Ecosystems, ETH Zurich, 8092 Zurich, Switzerland |
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Abstract: | Thirty Norway spruce trees (Picea abies (L.) Karst.) from the forest district of the ETH Zurich were tested for bending MOR, static MOE of bending and dynamic MOE
(calculated from eigenfrequency and sound velocity). The specimens were clear and were sampled from the whole of the stem.
Their correlations to density, annual ring width, height in the tree, distribution over the stem diameter and the percentage
of compression wood were statistically analysed. All three elasticity modules and the maximal stress can be very well predicted
from a linear function of the sample density with a common gradient across the compression wood values but with different
intercepts that decrease with increasing compression wood content. The other variables have highly significant impacts on
the response variables too, however, this is largely irrelevant for the goodness of fit. Further, a clear increase of density,
of MOE and of bending MOR was measured from pith to bark and similarly with decreasing annual ring width. Concerning the height
of the stem, no distinct trend for the mechanical properties could be found. |
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