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The patters of deformation in the annual ring and the cell for the wood applied the large deformation in the transverse compression

年轮和木材细胞的变形模式应用了横向压缩中的大变形

基本信息

批准号：
07660226
负责人：
IIDA Ikuho
金额：
$ 1.41万
依托单位：
Kyoto prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The deformed patterns of the annual rings, tracheid cell and pit fracture of coniferous heartwood sample applied large transverse compression were investigated and were discussed the relatively to improvement of liquid penetration.Result obtaind are as follow :1) The mainly compressive strain in a annual ring was not occurred the tracheid cells in the latewood, but happened in the early wood even precompressive ratio of 50 percent.2) When the wood samples were compressed in the radial direction, the deformation were happened with the wood cells of the local position on early wood into the annual ring which indicated a line of buckling along the tangential direction.It recognized a reason that the appearance of buckling line along tangential direction was dependent upon the ratio of latewoods.3) the cell deformation were occurred in the radial wall of the tracheids, and it is the two types of sigmoid curve and shear deformation. Those recognized to relatively in ratio (R/T) of lengths of radial (R) and tangential (T) directions.4) The deformable pattern of annual ring, wood cell differs respectively to the directions of radial, tangential, and 45 degree in compression perpendicular to grain. As to compressive direction in radial and 45 degree, cell deformation observed to starting from pit fracture. In the compressive deformation in the 45 degree, the cell in the latewood and neighboring cell of the ray were made the fracture in the cell walls.5) It is recognized from SEM observation that when wood applied the large transverse compression, the aspiration pit in trachids cell wall were occurred to break down and to peeling.

研究了针叶树心材在大横向压缩下的年轮、管胞细胞和纹孔破裂的变形规律，并探讨了其与液体渗透性提高的关系。1）年轮中的主要压缩应变不是发生在晚材管胞细胞中，而是发生在早期材，即使预压比为50 μ m。2）当木材样品沿径向压缩时，结果表明，早期木材局部位置的木材细胞进入年轮后发生了变形，年轮中出现了一条沿着切向的屈曲线，并认识到了沿着切向屈曲线出现的原因3）管胞径向壁发生细胞变形，变形类型有S形变形和剪切变形两种。4）年轮、木材细胞在径向、切向和45 °方向上的变形模式不同。在径向和45 °方向上，胞体的变形是从凹坑破裂开始的。在45 °的压缩变形中，晚材细胞和相邻射线细胞的细胞壁均发生破裂。5）SEM观察发现，木材在受到较大的横向压缩时，管胞细胞壁中的吸纹孔发生破裂和剥落。