云南杉木物理力学性质的研究

根据实验结果,杉木的木材密度、顺纹抗压强度以滇东南产的较低,滇中产的次之,滇西南产的较高。木材的抗弯强度以滇中产的较低,滇东南产的次之,滇西南产的较高。木材的抗弯弹性摸量以滇中产的较低,滇东南、滇西南产的相同。木材的冲击韧性以滇中产的较低,滇西南产的次之,滇东南产的较高。但三个栽培区的杉木主要物理力学指标的差异不大。同一栽培区阳坡生长的杉木密度和强度比阴坡生长的大,而不同坡向的杉木主要物理力学指标的差异比相同坡向的不同栽培区的杉木主要物理力学指标的差异大。实生的杉木密度和强度比插条者大。

STUDY ON THE PHYSICO--MECHANICAL PROPERTIES OF CHINESE FIR (Cunninghamia lanceolata)IN YUNNAN

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.