Results 211 to 220 of about 23,243 (257)
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Shiny Beech Wood is Confirmed as an Indicator of Tension Wood
IAWA Journal, 2008This study sought to develop a method to quantify tension wood areas in stem discs. It was suggested that the shiny appearance of beech (Fagus sylvatica L.) could provide an indication of tension wood. Each of 21 stem discs were digitised and the images analysed.
Barbacci, Adellin +4 more
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Elasticity of wood and wood polymer composites in tension compression and bending
Wood Science and Technology, 1991The ratio of tensile to compressive modulus of elasticity for untreated basswood was approx. 1.9 and for untreated sugar maple approx. 1.3. It approached 1.1 with high polymer loadings. The method of transformed sections gave good estimates of along the grain, tensile, compressive and bending elastic values for maple wood and maple wood polymer ...
M.H. Schneider, J.G. Phillips
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Occurrence of Peroxidase in Tension Wood of Angiosperms
Nature, 1956Tension wood in angiosperms can be readily induced by bending stems and branches from their normal orientation, when it develops usually on the upper side of the stem or branch, in the form of a dense band (compact type), or in groups of fibres or isolated fibres scattered among the normal fibres of the tissue (diffuse type).
A. B. WARDROP, E. SCAIFE
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The Detection of Tension Wood with Fluorescent Dyes
Stain Technology, 1960Sections of a thickness of 15 β cut from unfixed material by means of a freezing microtome were treated for 1 hr with 0.2% aqueous solutions of a number of fluorochromes. Under normal microscopical conditions no uniform staining pattern could be observed.
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A contribution to the ultrastructure of tension wood fibers
Wood Science and Technology, 1969Pronounced tension wood from four North-American hardwood species has been examined by light and electron microscopy. Delignified fibers were also studied. The gelatinous layer was in all cases loosely attached to S2 but varied considerably in thickness within each species and was in one case terminated towards the lumen by a layer resembling S3.
W. A. Côté, A. C. Day, T. E. Timell
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Micromechanics of wood subjected to axial tension
Wood Science and Technology, 1995The behaviour of a small group of wood fibers of Sitka spruce during tensile loading is investigated. The load-extension curves for both early and late wood fibers consist of three distinct segments. The first segment is almost a straight line, at some stage of loading a yield point is observed.
Parviz Navi +3 more
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Resistance Factor for Wood in Bending or Tension
Journal of Structural Engineering, 1987The reliability of dimension lumber in tension or bending is examined using advanced first‐order second‐moment reliability analyses. The material strength data are obtained from the literature. The reliability index for existing designs ranges from 1.1 to 3.7 for both bending and tension. Load combinations from the American National Standards Institute
William M. Bulleit, John G. Ernst
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Biology, Chemistry and Structure of Tension Wood
2013Trees maintain and adjust their stature by developing reaction wood in stems and branches. The physical properties of reaction wood result in a higher strain than in normal wood. Because reaction wood is only formed at one side of the stem, this unilateral strain creates a force and hence a movement of the stem or branches towards a more favorable ...
Judith Felten, Björn Sundberg
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Distribution of lignin in normal and tension wood
Wood Science and Technology, 1969The distribution of lignin in normal and tension wood of four hardwood species has been studied by examination in the electron microscope of the lignin skeletons remaining after removal of the polysaccharides with hydrofluoric acid. In normal wood fibers, the S1 had a higher lignin concentration than the S2 layer, which was not as highly lignified as ...
A. L. K. Bentum +3 more
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The fracture of wood in tension parallel to the grain
Canadian Journal of Civil Engineering, 1977The fracture of commercial Hem-Fir boards in the LR and LT modes was studied, using both saturated and air-dry specimens. Notched samples were tested in flexure (third-point loading). It was found that the concepts of linear elastic fracture mechanics could be applied, even when the crack extension was in a direction perpendicular to the initial notch.
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