15年生巨尾桉人工林木材物理力学性质的研究
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摘要
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、12 790、44.2、65 KJ/m~2,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、55.1 MPa,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128.1 MPa,属高强度树种;木材的综合品质系数达到了191.2 GPa,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 83.9 mpa, 12790 MPa, 44.2 MPa, and 65 KJ/m2, respectively. Hardness of end face, chord face and diameter face were 68.9 MPa, 51.3 MPa and 55.1 MPa, 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 128.1 MPa, belonging to high strength tree species. The comprehensive quality coefficient of wood is 191.2 GPa, belonging to low grade wood.
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 83.9 mpa, 12790 MPa, 44.2 MPa, and 65 KJ/m2, respectively. Hardness of end face, chord face and diameter face were 68.9 MPa, 51.3 MPa and 55.1 MPa, 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 128.1 MPa, belonging to high strength tree species. The comprehensive quality coefficient of wood is 191.2 GPa, belonging to low grade wood.
引文
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[2] GB/T1927 2009木材物理力学试材采集方法[S].
[3] GB/T1932～1942 2009木材物理力学试验方法[S].
[3] 祁述雄.中国桉树(第2版)[M].北京:中国林业出版社,2002.
[4] 李坚.木材科学研究[M].北京:科学出版社,2009.
[5] 徐有明,江建军.火炬松种源木材气干干缩性的变异,华中农业大学学报,1997,16(3):298- 303.
[6] 胡育辉.短周期速生桉树在中密度纤维板生产中的应用研究[J].建筑人造板,2000(2):29-30.
[7] 李晓清,唐森强,隆世良,等.桢楠木材的物理力学性质[J].东北林业大学学报,2013,41(2):77-79.
[8] 尹思慈.木材品质和缺陷[M].北京:中国林业出版社,1990.
[9] 许彩娟,符韵林,孙静.顶果木人工林木材物理力学性质[J].东北林业大学学报,2014(8):86-89.
[10] 黄腾华,符韵林,李宁.擎天树木材物理力学性质研究[J].西北林学院学报,2013,28(5):160-163.