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，使用云杉检查了各种压缩木材的特征方法，云杉的质量变化很小。在制造中，压缩比有所改变，并通过具有不同压缩比的样品进行了几种机械测试。获得了以下结果：（1）弹性性质的压缩比的影响比强度特性更为重要。（2）纵向方向上的杨氏模量随着压缩比的增加而增加，正如现有作品中通常发现的那样。因此，压缩过程被认为是一种有效的方法。但是，相反，随着压缩比的增加，弯曲强度并未显着增加。（3）当压缩木在适当的压缩比以相应的压缩比制造时，Young的模量在切向方向上，而在纵向区域平面中的剪切模量也会增加。然而，Young的模量I…更n个径向方向和泊松比和剪切模量在纵向辐射平面中倾向于降低。因此，当在实际操作中使用压缩时，有必要考虑这些特性的变化。（4）很难在径向和切向方向上的拉伸强度测量径向tangententials平面中的拉伸强度以及剪切强度，因为难以切割测试试样，以至于在这里无法削减压缩木材的强度，因此无法获得。包括此问题，应进一步研究以揭示压缩木材的强度特性。压缩比对压缩木材弹性特性的影响将于4月发表在“ Mokuzai Kogyo”中。至于弯曲和剪切优势以及有关横截面的弹性特性的问题，分别将文章提交给“木材科学技术”和“森林产品杂志”以供出版。较少的