›› 2012, Vol. 33 ›› Issue (3): 731-738.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Fractal features study of rock-like material damage based on gray correlation of digital images

ZOU Fei1, 2, LI Hai-bo1, ZHOU Qing-chun1, ZHU Xiao-ming1, MO Zhen-ze1, HE En-guang3, ZHAO Yu3, 4   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2. Guizhou Zhian Traffic Engineering Monitor & Test Center Co., Ltd., Guiyang 550000, China; 3. Tunnel Boring Machine Company of North Heavy Industry Group, Shenyang 110141, China; 4. Institute of Advanced Manufacturing Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2010-10-18 Online:2012-03-10 Published:2012-03-12

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Abstract: Based on uniaxial compression tests on gypsum specimens, a series of digital images of materials are obtained during the process from damage to failure. According to the gray correlation coefficient of the digital image, the damage magnitude is built to reflect damage evolution of the material. A series of binary images of the damage evolution are obtained by image processing. The fractal and multifractal spectrum theories are adopted to describe the damage evolution on material surface. The results show that the spatial and temporal corresponding relations exist between the distribution evolution of gray correlation coefficient and the localization of surface deformation. With the increase of damage on specimen surface, the relationship between fractal dimension and strain is linear; the curve of multifractal spectrum changes from symmetric single-peak form to left concentrated form and the spectral width decreases.

Key words: digital image, gray correlation, damage evolution, fractal dimension

CLC Number: 

  • TU 443
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