›› 2006, Vol. 27 ›› Issue (11): 1959-1962.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Mesomechanism of fracture process and subcritical fracture in sandstone

HE Man-chao1, HU Jiang-chun1, 2, WANG Hong-fang3, DUAN Qing-quan4   

  1. 1. School of Mechanics & Architecture Engineering, China University of Mining & Technology, Beijing 100083, China; 2. Department of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou 450007, China; 3. Department of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China; 4. Faculty of Mechanical and Electrical Engineering, China University of Petroleum, Beijing, 102249, China
  • Received:2005-02-23 Online:2006-11-10 Published:2013-12-04

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Abstract: The morphology of sandstone fracture main crack and subcritical fracture crack (that growth due to stress concentration but not turn into fracture main crack) in mesoscale level have been systematically investigated through the three-point bending fracture test with scanning electron microscope (SEM). It is shown that the fracture of sandstone behaved complicatedly, and correlated with not only the composition of sandstone binding material but also the distribution of sandstone fragmentary particle. Furthermore, there give birth to many subcritical fracture cracks in the fracture process. The morphology of fracture main crack and subcritical fracture crack is similar. Ductile fracture has been taken place if the specimen has many subcritical fracture cracks in the fracture process zone. Contrary that brittle fracture will be taken place.

Key words: sandstone, fracture mechanics, subcritical fracture crack, three-point bending fracture test

CLC Number: 

  • TU 452
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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