FEI Beng-hua, ZHANG Dong-Sheng. Using Fractural Crack and Stress Field to Study the Fractal Property of Wood. [J]. China Wood Industry (3):7-9(2003) DOI: 10.19455/j.mcgy.2003.03.003.
Using Fractural Crack and Stress Field to Study the Fractal Property of Wood
Wood cracks in an irregular path due to its anisotropic nature. This property also leads to the non-linear distribution of the crack in the two dimensions. The crack and stress-strain of Chinese White Poplar (Populus tomentosa) was studied by the box counting method. The results showed that the cracks were obvious fractal and that the value of dimension D was determined to be betw een 1.2 ~ 1.5 by studying the crack propagation in the two dimensions. By comparing the crack propagation over a period of time, we found that the value of D increased as the crack increased. The stress field of the crack revealed the fractal property and the value of D was found to be smaller at the tip of the cra ck and increased as the distance from the tip of the crack increased.