人工林落羽杉力学性能研究

对江汉平原人工林落羽杉物理力学性能进行了研究,结果表明:落羽杉的气干密度为0.413 g/cm3,气干密度等级为轻;综合强度为74 MPa,强度等级为Ⅰ级;径向横纹抗压强度略大于弦向横纹抗压强度;端面硬度最高,弦面硬度与径面硬度差别不大。落羽杉南北面近树皮处木材的密度、抗弯强度、弹性模量、顺纹抗压强度均大于近髓心处,南北方向对落羽杉的密度、顺纹抗压强度在5%水平上差异均不显著,而对其抗弯强度、弹性模量在1%水平上差异显著。

Study on the physical and mechanical properties of Taxodium distichum in Jianghan plain

The physical and mechanical properties of Taxodium distichum in Jianghan plain were studied.The results were as follows.The density of Taxodium distichum was 0.413 g/cm3,and its density grade was low in terms of the wood physic-mechanical classifying criteria.Its integrated MOR（modulus of rupture） was 74MPa,which was very low in terms of the wood physic-mechanical classifying criteria.Its radial compression strength perpendicular to grain of wood was bigger than that of tangential direction,which was strongly related to its structure.The transverse hardness was the highest,while radial hardness was nearly the same with tangential hardness.Outer wood had higher properties than core wood.In addition,Variance analysis of physical and mechanical properties affected by direction was researched.The density and compression strength parallel to grain had no statistically significant difference（at 5% level） between north and south directions,while MOR and MOE had significant difference（at 1% level）.