TAILIEUCHUNG - Báo cáo khoa học: "Évaluation de deux méthodes acoustiques de détermination du module d’élasticité de bois de mélèze hybride jeune (Larix x eurolepis Henry) - comparaison avec une méthode normalisée en flexion statique"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Évaluation de deux méthodes acoustiques de détermination du module d’élasticité de bois de mélèze hybride jeune (Larix x eurolepis Henry) - comparaison avec une méthode normalisée en flexion statique. | 333 Ann. For. Sci. 56 1999 333-343 Inra Elsevier Paris Article original Evaluation de deux methodes acoustiques de determination du module d élasticité de bois de meleze hybride jeune Larix X eurolepis Henry - comparison avec une méthode normalisée en flexion statique Michele Marchal Dominique Jacques Centre de recherche de la nature des forets et du bois ministère de la region Wallonne DGRNE avenue Marechal-Juin 23 B-5030 Gembloux Belgique Reẹu le 21 juillet 1998 accepté le 21 janvier 1999 Abstract - Evaluation of two acoustic methods of MOE determination for young hybrid larch wood Larix X eurolepis Henry . Comparison with a standard method by static bending. Based on 384 normalised specimens sampled in 32 hybrid larch stems from a 14-year-old clonal test wood quality was evaluated by measuring the modulus of elasticity by means of two acoustic testing methods the major point of interest being the speed of handling. Results were compared to those given by a third method chosen as the reference one and described by the French norm NF B 51-016. Furthermore specific gravity and ring width were measured and presence of compression wood noted. Simple regression equations gave close relationships between each of the two acoustic methods and the reference one. This could lead to interesting applications in the field of large scale systematic tests. Finally the impact of some factors clone ramet in clone compression wood density and ring width were evaluated by the residue distribution around the regression line. Inra Elsevier Paris non destructive method modulus of elasticity scatter analysis compression wood I clone Larix X eurolepis Henry Resume - Sur la base de 384 éprouvettes normalisées 20 X 20 X 360 mm issues de 32 arbres d un test clonal de 14 ans de meleze hybride. le module d elasticite a été determine à 1 aide de deux méthodes acoustiques dont rintérêt majeur est la rapidité d execution. L une de ces méthodes est basée sur la mesure du temps de propagation d .

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