马尾松纤维的力学性能研究

Mechanical Properties of Pinus Massoniana Fibers

研究了人工林马尾松的纤维零距抗张强度、细胞壁的纵向弹性模量和硬度等力学指标。结果表明：马尾松纤维的零距抗张强度介于413-631MPa之间，平均为513MPa，从髓心向边材呈增大趋势，在同一年轮内晚材纤维强度显著大于早材；纤维细胞壁的纵向弹性模量和硬度在擘厚方向不一致，次生壁的弹性模量显著大于复合胞问层。两者之间的硬度差异不显著；成熟材次生壁纵向弹性模量和硬度均大于幼龄材。分别高出约40％和13％。

The tensile strength, modulus of elasticity（MOE） and hardness of Pinus massoniana fibers were determined by using zero-span tension and nanoindentation technique. It was shown that the average zero-span tensile strength of early wood fibers was 513MPa, ranging from 413 MPa to 631MPa.The mean strength of the earlywood fibers increased from the pith to the bark. The hardness of the compound middle lamella was almost as high as that of the secondary wall, but the MOE of the compound middle lamella was 50% lower than that of the secondary wall. There was about 40% increase in the average modulus of elasticity （12.91 to 17.89 MPa） and about 13% increase in the average hardness （0.40 to 0.46 GPa） of the late mature wood compared with the early jure, file wood of Pinus massoniana.