Mechanical properties of secondary quality beech (Fagus sylvatica L.) and oak (Quercus petraea (Matt.) Liebl.) obtained from thinning, and their relationship to structural parameters

This paper investigates the juvenility limit and structure–property relationship in secondary quality beech ( Fagus sylvatica L.) oak Quercus petraea (Matt.) Liebl.). The juvenile wood occupies a very small area near pith. stabilization of different parameters varies over time. Adding microfibril angle (MFA) grain to MOE prediction model significantly improves model, despite little variation both parameters. Using qualities logs hardwoods such as for engineered products is an increasingly important issue due technological challenges processing smaller denser woods. Secondary are expected have less mechanical properties compared softwoods with high content. first objective this study was investigate radial suppressed growth trees obtained from thinning operations. second develop predict these hardwood species based on their structural angle, ring density, width pith bark were determined using X-ray densitometer. modulus elasticity rupture evaluated clear specimen three-point bending test. also measured. results show that has wider higher whereas it latewood beech. For species, area, than 5 cm comparable reported literature dominant trees. best predicted angle. better density alone Juvenile found can be used place mature wood. It take into account when predicting species.