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Establishment of characterization methods of compressed wood and analyses of its deformation and failure behaviors

压缩木材表征方法的建立及其变形破坏行为分析

基本信息

批准号：
15580147
负责人：
YOSHIHARA Hiroshi
金额：
$ 2.3万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

In this research, various characterization method of compressed wood were examined using spruce, which has a small variation in quality. Compression ratio was variously changed in the fabrication, and several mechanical tests were conducted by the specimens with various compression ratios. Following results were obtained :(1)The influence of compression ratio was more significant in the elastic properties than in the strength properties.(2)Young's modulus in the longitudinal direction increased with the increase of the compression ratio, as was found commonly in the existing works. Therefore, the compression process was thought to be an effective method. In contrast, however, the bending strength did not significantly increase with the increase of compression ratio.(3)When the compressed wood was fabricated under an appropriate compression ratio, Young's modulus in the tangential direction and shear modulus in the longitudinal-tangential plane increased. Nevertheless, Young's modulus i … More n the radial direction and Poisson's ratio and shear modulus in the longitudinal-radial plane tended to decrease. When using the compressed in practical operations, hence, it is necessary to consider the variations of these properties.(4)It was so difficult to measure the tensile strengths in the radial and tangential directions and shear strength in the radial-tangential planes because of the difficulty in cutting the test specimens that the strength properties concerning to the cross section of compressed wood could not be obtained here. Including this issue, further research should be addressed for revealing the strength properties of compressed wood.The influence of the compression ratio on the elastic properties of compressed wood will be published in "Mokuzai Kogyo" in April. As for the issues on the bending and shear strengths and on the elastic properties with concerning to the cross section, articles were submitted to "Wood Science and Technology" and "Forest Products Journal" for publication, respectively. Less

在这项研究中，压缩木材的各种表征方法进行了检查，云杉，这有一个小的质量变化。在制作过程中对压缩比进行了不同程度的改变，并对不同压缩比的试件进行了力学性能试验。结果表明：（1）压缩比对弹性性能的影响大于对强度性能的影响。（2）纵向杨氏模量随着压缩比的增加而增加，这是现有工作中常见的现象。因此，压缩过程被认为是一种有效的方法。相反，抗弯强度并没有随着压缩比的增加而显著增加。（3）在适当的压缩比下，压缩木材的切向杨氏模量和切向剪切模量增大。然而，杨氏模量i ...更多信息在径向上，泊松比和剪切模量呈减小趋势。因此，在实际操作中使用压缩时，有必要考虑这些性质的变化。(4)It由于试件切割困难，难以测量径向和切向的抗拉强度以及径向-切向平面的剪切强度，因此无法获得压缩木材横截面的强度特性。因此，为了揭示压缩木材的强度特性，还需要进一步的研究。关于压缩比对压缩木材弹性特性的影响，将于4月在《木材工业》上发表。关于抗弯强度、抗剪强度和弹性性质与横截面有关的问题，分别向《木材科学与技术》和《林产学报》投稿。少