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Bending strength and modulus of elasticity of Pinus sylvestris round timber from southern Norway

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To enable use of round Scots pine timber in structural frameworks it is necessary to estimate the mechanical properties of the material. This paper presents data on density, bending strength and modulus of elasticity (MOE) of 533 debarked Scots pine logs with diameter from 75 mm to 250 mm sampled from 10 sites in southern Norway. The results show that round timber can have high values of bending strength and MOE, depending on the sites from which the trees have been collected. Some of the variation in bending properties can be explained by visual characteristics, but since a significant proportion of the residual variance is related to sites, criteria for visual strength grading have to be conservative to be valid across all sites. The potential for machine grading based on measuring MOE is better since this model is more accurate and the random effect of site is smaller.

Keywords: Bending strength; Pinus sylvestris; Scots pine; density; modulus of elasticity; round timber

Document Type: Research Article


Affiliations: Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences (UMB), Ås, Norway

Publication date: April 1, 2010

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