摘要
重组竹是一种资源节约型竹材胶合类产品,具有突出的力学性质,已逐渐步入建筑结构用工程材料。为客观合理地评价其力学性能,本文以毛竹基重组竹作为研究对象,对各项力学性能指标、破坏模式和机理进行了研究。结果表明：重组竹物理力学性能均一稳定,密度的变异系数仅为3.45%,但力学性能具有明显的两向性,且其强度明显高于普通木材,分别是马尾松和杉木的1.10-6.36倍和1.59-11.03倍;其顺纹抗拉、横纹抗拉、顺纹剪切试样均为脆性破坏,试样的断裂口层次不齐且均在有效区域;而重组竹顺纹抗压、横纹局部抗压和横纹全部抗压试样均为延性破坏特征,以压溃破坏的模式呈现。综合而言,重组竹材料能够完全满足建筑结构用材的力学强度要求。
Recombinant bamboo with outstanding mechanical properties and resource saving characteristics is a kind of bamboo plywood products, it has been used as structural material for building construction gradually. In order to evaluating the mechanical properties objectively, the mechanical strength, failure mode and mechanism were studied by taking recombinant bamboo made of Moso bamboo as research object. The results showed that the mechanical properties of recombinant bamboo are uniform and stability and significantly higher than ordinary wood, the coefficient of variation of density is only 3.45%. The mechanical properties has a characteristic of obvious two tropism, and it is 1.10 - 6.36 times and 1.59 - 11,03 times of pinus massoniana and cunninghamia lanceolata respectively. Besides, the tensile strength parallel and perpendicular to grain, shearing strength parallel to grain are showed brittle failure with irregular fracture in effective areas in all samples. While, compressive strengths including parallel to grain and perpendicular to grain（ whole and local） are all ductile fracture, which showed as crushing destructions. Comprehensive, recombinant bamboo could satisfy the mechanical strength requirements of structural material, completely.
作者
李霞镇
钟永
任海青
肖纲要
LI Xia-zhen ZHONG Yong REN Hai-qing XIAO Gang-yao(Hunan Testing Institute of Product and Commodity Supervision, Changsha, 410007, China Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China)
出处
《木材加工机械》
2016年第4期28-32,共5页
Wood Processing Machinery
基金
湖南省质检院科技项目(Y2016T09)
十二五科技支撑项目(2012BAD23B01)
关键词
重组竹
力学性能
结构材
破坏模式
recombinant bamboo
mechanical properties
structural material
failure mode
