火力楠人工林木材物理力学性质的研究

为掌握火力楠人工林木材的性质，为其木材利用提供科学指导，对火力楠人工林木材的主要物理力学性能指标进行了测定分析。结果表明，火力楠人工林木材的基本密度、气干密度以及全干密度平均分别为0.531、0.641 g·cm^-3和0.596 g·cm^-3，弦向、径向和体积气干干缩率平均分别为3.9%、2.7%和6.5%，对应的干缩系数平均分别为0.346%、0.239%和0.576%，差异干缩为1.444，属密度适中、干缩性小的一类木材；木材端面、弦面和径面硬度平均分别为5 989、4 847 N和4 829 N，抗弯强度、弹性模量、顺纹抗压以及冲击韧性平均分别为117.2 MPa（3级），10.61 GPa（3级）、57.8 MPa（3级）和55 kJ·m^-2（2级），综合强度达175 MPa，综合品质系数达3 295.7×10⁵ Pa，属高等级材。

Physical and Mechanical Properties of Michelia macclurei Plantation Wood

In order to master the properties of Michelia macclurei plantation wood and to provide scientific guidance for its utilization,the main physical mechanical properties of the wood were studied.The results showed that the M.macclurei plantation wood belonged to medium density grade and the oven-dried shrinkage coefficient was in small category.The basic,air dried,and and oven dried densities were 0.531,0.641,and 0.596 g·cm^-3,respectively.Tangential,radial and volume shrinkage ratios of air dried sample were 3.9%,2.7%,and 6.5% with shrinkage coefficients of 0.346%,0.239% and 0.576%,respectively,and the difference of oven-dried shrinkage was 1.444.The values of hardness on cross,tangential and radial surfaces were 5 989,4 847,and 4 829 N respectively.The values of bending strength,modulus of elasticity,compression strength parallel to grain and impact toughness were 117.2 MPa(level 3),10.61 GPa(level 3),57.8 MPa(level 3),and 55 KJ/m^2(level 2),respectively.The comprehensive strength was 175 MPa.The comprehensive quality coefficient of the wood was 3 295.7×10^5 Pa,belonging to high-grade wood.