Non-destructive evaluation of beech and oak wood bent at different radii

The aim of this study was to investigate the parallel and perpendicular velocity and transmission time of beech and oak wood bent at different radii. Two trees from each wood species, having straight trunks of approximately 40 cm in diameter, were selected, and two 4-m logs were cut from each tree. The prepared samples, except those from the control groups, were steamed, bent and set. The samples were bent at three different radii (300 mm, 200 mm and 100 mm) in the tangential direction. The density, parallel and perpendicular (radial and tangential) velocity and transmission times of the beech and oak wood were determined. The results of this study showed that the bent samples of beech and oak wood had higher density compared to the unbent groups. The density of both wood species increased with the decreasing bending radius. The highest velocity parallel to the fibers was measured on the convex surface, while the lowest was measured on the concave surface. The parallel and perpendicular velocity decreased as the bending radius decreased.