The Fracture Mechanics of Plant Materials by Zhuoping Shao & Fuli Wang

Author:Zhuoping Shao & Fuli Wang
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

(6.7)

where

6.1.3.3 Fractal Dimension of Fracture Surface

After the experiment, the CT sample was not separated absolutely because of fiber bridge, it was needed to be separated artificially. In order to measure DS, we put the fracture surface at the digital microscope with 3CCD and its pixel is as high as 5,400,000. The digital microscope can show the 3D structure of the fracture surface for its function of restructure and it can also measure the length of contour line between any two points automatically. To collect a complete information of the fracture surface, 4 × 5 = 20 testing surface elements (Fig. 6.4) were chosen from the natural incisive crack surface (about 20 × 12.5 mm2). We obtained the 3D image of the testing surface element under 60 times of microscopy magnification, and drew 5 contour lines along longitudinal and tangential direction by electronic scanning on the surface element (Fig. 6.5). Figure 6.6 shows an in log–log representation curve of one C. lanceolata sample of the box-counting method which the liner regression is used to measure the fractal dimension. Then DS of the fracture surface in meso-field could be gained. The average values of DS of five kinds of tree are shown in Table 6.1.

Fig. 6.4Testing surface elements of fracture surface of CT sample

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