云南杉木物理力学性质的研究——彝良产杉木物理力学性质

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。

A STUDY ON THE PHYSICO-MECHANICAL PROPERTIES OF CHINESE FIR(CUNNINGHAMIA LANCEOLATA)IN YUNNAN-THE PHYSICO-MECHANICAL PROPERTIES OF CHINESE FIR IN YILIANG

This paper reports the physico-mechanical properties of Chinese fir grown in Yiliang,and concludes that its latewood percentage and air-dried density are higher than that grown in other regions of Yunnan while its compression strength parallel to grain, bending strength,maximum tensile strength parallel to grain etc.have distinct reduction so that they are neither in accordance with the interrelation between the density of wood and mechanical strength of wood,nor the regression equation for the wood density value and mechanical strength value. The authors have also measured fibril angle of wood fiber cellulose walls of Chinese fir grown in both Yiliang and Xichou.The result has shown that fibril angle of wood fiber cel-lulose walls of Chinese fir grown in Yiliang is 9.7° bigger than that grown in Xichou,and that the compression strength parallel to grain bending strength,maximum tensile strength parallel to grain etc.of Chinese fir are obviously reduced while the fibril angle be-comes enclarged.