摘要
选取日本落叶松为试验材料,开展不同树龄日本落叶松物理力学性质的比较研究。结果表明:43年生、30年生和17年生日本落叶松木材气干密度分别为0.607,0.567和0.507 g/cm3,气干体积干缩率分别为7.7%,7.7%和7.1%;全干到气干体积湿胀率分别为5.1%,4.9%和4.5%;抗弯弹性模量分别为17.527,16.775和12.510 GPa,抗弯强度分别为121.1,110.3和90.9 MPa,顺纹抗压强度分别为56.8,51.8和44.0 MPa。随着树龄增大,日本落叶松木材密度、顺纹抗压强度、抗弯强度和抗弯弹性模量等各项物理力学性能指标提高,差异干缩逐渐变小。日本落叶松木材的气干密度与抗弯弹性模量、抗弯强度、顺纹抗压强度呈线性正相关,相关系数分别为0.760,0.816和0.900。
The influence of tree age on physical and mechanical properties of Larix kaempferi wood was investigated in this study. The results showed that densities of 43-year-old, 30-year-old and 17-year-old air-dried samples were 0. 607, 0. 567 and 0. 507 g/era3 , respectively. Their volumetric shrinkage were 7.7% , 7.7% and 7.1% while the volumetric swelling from ovendry to air-dried status were 5.1% , 4.9% and 4.5% , respectively. The modulus of elasticity（MOE） values were 17,527, 16.775 and 12. 510 GPa, respectively. The modulus of rupture（MOR） values were 121. 1, 110.3 and 90.9 MPa, respectively. Compressive strength parallel to grain （CSPG） were 56.8,51.8 and 44.0 MPa, respectively. It could be concluded that the density, MOE, MOR and CSPG of Larix kaempferi increased with tree age while its shrinkage anisotropy decreased with it. The air-dried density of wood exhibited positive linear relationship with MOE, MOR and CSPG with the correlation coefficients of 0.760, 0. 816 and 0. 900, respectively.
出处
《林业科技开发》
北大核心
2014年第4期54-57,共4页
China Forestry Science and Technology
基金
国家林业公益性行业科研专项(编号:201104027)
关键词
日本落叶松
树龄
物理力学性能
Larix kaempferi
tree age
physical and mechanical properties
