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一、前言木材为主要工业原料之一,随着工业的发展,仅有木材物理力学性质指标中的一般试脸项目已不能满足用材部门的要求。为进一步合理利用和节约木材,以便更系统、更全面地提供建筑、交通、航空、军工、农具、机械等用材部门的设计数据,1960年开始进行木材扭曲性质的研究。木材扭曲强度十分复杂,国内外对这方面的研究成果还不多,迄未获得标准试验方法。木材在碾磨的回转轴、车轴、飞机上的螺旋桨,以及一切使用木材在机械力作用下转动的轴、器械、农业机械等等而使用木材的纤维呈螺旋线扭转的地方
I. Introduction Wood is one of the main industrial raw materials. With the development of industry, only general test-face projects in the index of physical and mechanical properties of wood can no longer meet the requirements of timber department. In order to further rationalize the use and conservation of wood in order to provide more systematic and comprehensive design data for the timber, construction, transportation, aviation, military, farm machinery and machinery sectors, the study on the nature of wood distortions began in 1960. The twisting strength of wood is very complicated. There are not many research results in this area at home and abroad, so it has not obtained the standard test method. Wood in the milling of the rotating shaft, axles, propellers on the plane, as well as all the use of wood under mechanical force to rotate the shaft, equipment, agricultural machinery, etc. The use of wood fibers twisted helix place