The main aim of research was to investigate spatial physical and mechanical properties in over-matured (more than 300 years) pine tree stem. Research completed using two concepts. In the first model, density and stiffness-strength variation was observed by the pith-to-bark and longitudinal direction estimating distance from pith to centre of each specimen in millimeters. In the second approach, number of tree rings estimated in order to evaluate cambium age, eccentricity, and then density variation in radial pith-to-bark direction.
Specimens’ properties taken from over-matured pine tree butt, middle, and top logs were modeled in spatially polar coordinate system. Variation of results explained by numerical models and visualization in black and grey scale graphical models.
Keywords: over-matured wood, density, cambial age, radial-longitudinal variation
Authors
Subačius L.
Department of Wood Technology, Kaunas University of Technology, Kaunas, Lithuania
Baltrušaitis A.
Faculty of Design and Technologies, Kaunas University of Technology, Kaunas, Lithuania
Pranckevičiene V.
Department of Wood Technology, Faculty of Design and Technologies, Kaunas University of Technology, Kaunas, Lithuania
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