›› 2010, Vol. 31 ›› Issue (9): 2743-2748.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research for determining mode I rock fracture toughness KIC using cracked chevron notched brazilian disc specimen

CUI Zhen-dong1，LIU Da-an1，AN Guang-ming1，ZHOU Miao2，LI Zhi-qing 3, 1   

  1. 1. Key Laboratory of Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China; 3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
  • Received:2009-04-28 Online:2010-09-10 Published:2010-09-16

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Abstract:

Cracked chevron notched brazilian disc (CCNBD) specimen configuration has been used to test the mode I fracture toughness of muddy sandstone according to the ISRM d suggested testing method in 1995. A new cutting procedure of CCNBD specimen is given. Specific rock fracture characteristics have been observed. The valid size range and fracture mechanism of this specimen type have been discussed. Then the advantages and disadvantages of CCNBD method are pointed out. It can be concluded as follows: (1) Derived fracture toughness values are sensitive to the variation of CCNBD specimen diameters; and more consistent fracture toughness values can be derived by the specimen with larger diameter than the ISRM suggested “minimum effective diameter 75 mm”. (2) Fracture mechanism of CCNBD specimen is mode I crack growth type under the synthetic stresses of the dominant tensile stress (indirect tensile) and the in-ligament shear stress. (3) CCNBD method has advantages with simple sample preparation, bearing a greater critical load and generating compatible KIC values. But this method has not considered the nonlinearity of fracture process zone (FPZ); and it is lack of the nonlinearity calibration procedure. It is advised to develop nonlinearity calibration procedure for the CCNBD method in order to generate more accurate testing results.

Key words: rock fracture toughness, cracked chevron notched brazilian disc (CCNBD), crack growth, fracture mechanism

CLC Number: 

  • TU 458
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