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林业科学 ›› 2006, Vol. 42 ›› Issue (3): 104-107.doi: 10.11707/j.1001-7488.20060320

• 研究简报 • 上一篇    下一篇

木材断口分形的初步研究

费本华 覃道春 杨忠   

  1. 中国林业科学研究院木材工业研究所,北京100091
  • 收稿日期:2003-07-14 修回日期:1900-01-01 出版日期:2006-03-25 发布日期:2006-03-25

An Approach to Study the Fractal Character of Wood Fracture

Fei Benhua,Qin Daochun,Yang Zhong   

  1. Research Institute of Wood Industry,CAF Beijing 100091
  • Received:2003-07-14 Revised:1900-01-01 Online:2006-03-25 Published:2006-03-25

关键词: 木材, 断口, 分形, 截面变化维数

Abstract:

It is very difficult to characterize the fracture surface of wood with traditional way because of its irregularity and complexity. This paper, inspired from slit island method (SIM) and mass fractal method, proposes a new method, by which the change of sectional area with spatial location in wood fractures can be determined, to quantify the character of fracture surfaces. The experiment is done by continuously microtoming a fractured sample embedded with paraffin at intervals of hundreds micron along the longitudinal axis from tip to end of fracture. The results indicate there exists a linear correlation between the area and the corresponding location in a double logarithm coordinate. The slope, here termed as section variation dimension (DL), is located between 2.23 to 2.75 with the DL of pressed zone being smaller than that of tensile zone for a wood fractured by static bending, and DL can be used to describe quantitatively the complexity of fracture surface of wood.

Key words: wood, fracture, fractal, section variation dimension