摘要
本文报道了彝良产杉木的物理力学性质,测出其晚材率和气干密度比云南其它地区所产者均高,而顺纹抗压强度、抗弯强度、顺纹抗拉强度等有明显的降低,不符合木材密度与各强度值间的回归方程。此外,还进行了彝良和西畴产杉木纤维胞壁的纤丝角的测定。结果发现彝良产杉木纤维胞壁的纤丝角比西畴产者大9.7°,从而得出杉木的顺纹抗压强度、抗弯强度、顺纹抗拉强度等随着纤维角的增大而明显地减小。
According to test results, the density of wood and the parallel compressive strength of Chinese fir grown in the South-east of Yunnan are the smallest, the ones in the central are larger and the ones in the South-west the largest. The bending strength of timber grown in the central is the smallest, next is the one in the South-east, and the one in the South-west is the largest. The modulus of elasticity of timber grown in central region is smaller, and the similar in the Southeast and South-west. The toughness of the wood grown in central region is the smallest, next comes the one in the South-west, and the largest is the one in the South-east. In a word, differences of physico-mechanical properties in these three cultivated regions are not large. The density and strength of Chinese fir grown in a sun slope are larger than those grown in a shade slope in the same cultivated region, and the differences of physico-mechanical properties of Chinese fir grown in different slope directions are larger than those grown in the same slope direction in different cultivated regions, The density and strength of the Chinese fir of seedings are larger than those grown out of cuttings.
出处
《西南林学院学报》
1993年第1期56-60,共5页
Journal of Southwest Forestry College
关键词
杉木
物理学
木材
力学性质
Cunninghamia lanceolata
Physical property
Mechanical strength
