文献类型：期刊文献

中文题名：木材横纹理断裂及强度准则

英文题名：FRACTURE PERPENDICULAR TO GRAIN OF WOOD AND STRENGTH CRITERION

作者：邵卓平[1] 任海青[2] 江泽慧[2]

第一作者：邵卓平

机构：[1]安徽农业大学;[2]中国林业科学研究院木材工业研究所

年份：2003

卷号：39

期号：1

起止页码：119-125

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家九五攀登专题"人工林木材断裂性质研究"的部分内容

语种：中文

中文关键词：木材横纹断裂;断裂韧性;强韧机理;强度准则

外文关键词：Transverse fracture of wood, Fracture toughness, Mechanism of strong toughness, Strength criterion

分类号：S781.23

摘要：以杉木为研究对象从宏观和微观上研究了木材横纹断裂的性质 ,并阐述了木材的强韧机理。研究表明 :木材横纹I型裂纹扩展方式是先沿纤维开裂伸展 ,然后再沿横截面作韧性断裂 ,其扩展过程分线性、稳定和非稳定 3个阶段 ;顺纹启裂时的断裂韧性与试件尺寸无关 ,是木材的固有属性 ;木材因其多胞及纤维增强的多层胞壁结构 ,而具有很强的抗横断韧性 ,不会因裂尖应力奇异性而发生低工作应力破坏 ,故在对含横纹理裂纹的木构件作安全设计时 ,建议仍采用传统的强度准则 ,考虑净尺寸上的常规强度即可。
The characteristics of transverse fracture of Chinese Fir from macro and microcosmic, and the mechanism of strong toughness of wood was studied in this paper. The results are:The spread manner of transverse crack is that crack crazes through the grain firstly, and then rupture toughly along the cross section. The spread process of crack is divided into three steps:linearity, stabilization and non stabilization. The crazing toughness is independent of sample dimensions, for it is an inherent property of wood. Because of more cell and more layer with fibre reinforced structure, wood have a good toughness for transverse fracture. So in the low working stress condition, it could not be broken by the stress singularity from the point of the crack. Considered of this, when making safety designs of the wood components, traditional strength criterion could still be adopted and it is enough to calculate the general strength of remained dimension.