木材薄板横纹压缩强化的微观结构变化.pdfVIP

林 科 业 学 Vol. 46 ,No. 11 第 46 卷第 11 期 2010 年 11 月 5CIENTIA 5ILVAE 5INICAE Nov. ,2010 木材薄板横纹压缩强化的微观结构变化 赵钟声崔永志于海鹏刘一星沈隽 (东北林业大学材料科学与工程学院 哈尔~ 15ω40 ) 摘 要: 以锯切大青杨、旋切白桦、刨切紫粮3 种木材薄板为研究对象，用常混水浸泡至饱水状态后不绞热软化 预处理进行横纹压缩强化，通过扫描电镜观察分析横纹压缩强化前后 3 种水材的来压缩材和压缩材横、纵切面上 的微观结构变化，从微观层面探讨此方法强化3 种木材薄板的可行性和有待改进、完善之处。结果表明: 3 种木材 的压缩材横切丽上整体变形较均匀，攒、纵切丽上均米发现压缩裂纹或破坏，纵切而上导管壁均有因压缩产生顺纤 维方向的横向挤压衍皱条纹;横切面上，大青杨、紫椒压缩材管孔沿压缩方向变形最大，白梯压缩材管孔沿其长输 方向变形最大，并使两侧沿压缩方向、径向排列的水射线细胞和木纤维细胞发生侧向扭曲变形。 关键词: 横纹压缩;强化;木材薄饭;微观结构;扫描电镜 中阁分类号: 5781 文献标识码:A 文章编号:1ω1 -7488(2010) 11 -0124 -07 Micro-Structure Examination of Strengthened Wood Sheets by Compression Perpendicular to Grain Zhao Zhongsheng Cui Yongzhi Yu Haipeng Liu Yixing Shen Jun (Makri l Scknce αnd Ellginurillg ColÚ!ge ,Northeall Fore,ry UllifJfI ity Hα， rbill 15仰40) Abstract: Saw cutting wood sheet of Populw ω$uriernÎ$， rotaηcutting wood sheet of Betula platyphylla and planer slicing wood sheet of Tilia αmurensÎ$ were dipped in water under nonnal temperature until water-saturated , and then were compressed perpendicular to grain. The micro-structure at across-grain section and along-grain section of wood sheets before and after compression were examined with scanning electron microscope , and aimed to probe the feasibility of this wood sheets stren阶ened method. The results showed that: the entirety compression de{ormations o{ these three species were relatively even and well-distributed , no obvious di{{erences between the surface and the intemal. The