欢迎访问林业科学,今天是

林业科学 ›› 2002, Vol. 38 ›› Issue (1): 136-140.doi: 10.11707/j.1001-7488.20020121

• 问题讨论 • 上一篇    下一篇

木材干缩的分形分析

费本华   

  1. 中国林业科学研究院木材工业研究所,北京100091
  • 收稿日期:1999-04-16 修回日期:1900-01-01 出版日期:2002-01-25 发布日期:2002-01-25

THE FRACTAL NATURE OF WOOD REVEALED BY DRYING

Fei Benhua   

  1. Research Institue of Wood Industry, CAF Beijing 100091
  • Received:1999-04-16 Revised:1900-01-01 Online:2002-01-25 Published:2002-01-25

摘要:

本文通过一个木材干缩实验,展示了木材多孔性的分形特征。用银杏(Ginkgo biloba L.)和板栗(Castanea mollissima)木材作试材,用逐渐升高温度的方式处理试样,同时称重和量取尺寸,可以获得不同温度之间的重量和体积变化值,由变化值和立方体边长的对数值得直线斜率。直线斜率反映了木材中空隙体积的分形维数。这种方法可以通过不同树种、不同温度状态下木材水分逸出过程空隙空间分形维数的变化,分析木材的干缩规律。建议分形理论可成为木材多孔性研究的有效途径。

关键词: 木材, 干缩, 多孔性, 分形

Abstract:

We used a experimental procedure of wood drying to show the nature of the pore space in wood. Cubic blocks of Ginkgo biloba and Castanea mollissima wood were executed, and posting them in oven, the temperature was increased after 4 hours and measured the mass changes of weight and volume at the same time, the plots of the mass versus block edge sizes are straight lines whose slopes correspond to the fractal dimensions of the void volume in the wood. Results for different species and for distinct temperature are shown. Suggesting the fractal dimension as a new relvant to parameter to characterize the porosity of wood.

Key words: Wood, Drying, Porosity, Fractal