15年生巨尾桉人工林木材物理力学性质的研究

Physical and Mechanical Properties of Timber of E.grandis×E.urophylla

为了更好开发利用15年生巨尾桉人工林木材,本研究以广西南宁市树木园15年生巨尾桉(Eucalyptus×E.urophylla)人工林木材为研究对象,对其物理以及力学性质进行了测试、分析。结果表明,15年生巨尾桉属中密度等级材,体积干缩系数小;抗弯强度,抗弯弹性模量、顺纹抗压强度和冲击韧性分别为83.9、12790、44.2、65KJ/m2,对应的强度等级分别为2级、3级、1级、2级;端面、弦面和径面的硬度分别为68.9、51.3、55.1MPa,其中端面硬度已经达到了4级标准,弦面和径面的硬度也达到了三级标准。木材综合强度为128.1MPa,属高强度树种;木材的综合品质系数达到了191.2GPa,属于低等级材。

In order to make better use of the timber of Eucalyptus,the timber of eucalypt( E.grandis×E.urophylla )in Nanning was analyzed in terms of its physical and mechanical properties.The results showed that eucalyptus was a medium density grade wood,with small coefficient of volume dry shrinkage.The bending strength,bending elastic modulus,compressive strength along the grain and impact toughness are 83.9mpa,12790MPa,44.2MPa,and 65KJ/m2,respectively.Hardness of end face,chord face and diameter face were 68.9MPa,51.3MPa and 55.1MPa,respectively.Among them,the end surface hardness has reached the level 4 standard,and the chord surface and diameter surface hardness has also reached the level 3 standard.The comprehensive strength of wood is 128.1MPa,belonging to high strength tree species.The comprehensive quality coefficient of wood is 191.2GPa,belonging to low grade wood.