›› 2013, Vol. 34 ›› Issue (9): 2449-2459.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Test method for determining rock dynamic fracture toughness using P-CCNBD specimens

GOU Xiao-ping1，YANG Jing-rui1，WANG Qi-zhi1, 2   

  1. 1. Department of Civil Engineering and Applied Mechanics, Sichuan University, Chengdu 610065, China; 2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
  • Received:2012-06-25 Online:2013-09-11 Published:2013-09-13

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Abstract: Pre-cracked chevron notched Brazilian disc (P-CCNBD) is made by slightly cutting the notch tip of cracked chevron notched Brazilian disc (CCNBD) into a straight crack front. The P-CCNBD specimens of sandstone are diametrically impacted by the split Hopkinson pressure bar, the experimental recordings are then used in the succeeding numerical analysis to get the mode-I rock dynamic fracture toughness. In order to verify the reliability of the numerical simulation, the dynamic finite element analysis for a finite crack in an infinite plate subjected to impact tension at crack faces is simulated first; the results of the numerical simulation are highly consistent with those in the literature. The results of our experimental-numerical method are compared with those of quasi-static method proposed by others, certain difference is observed. On the other hand, results of P-CCNBD are in good agreement with those of the more mature specimen (cracked straight-through Brazilian disc—CSTBD), both are determined with the experimental-numerical method. The derived dynamic initiation fracture toughness increases with increasing loading rate, demonstrating the loading rate effect. The drawbacks of the quasi-static method to test the dynamic fracture toughness are analyzed. The result obtained by experimental-numerical method is more reasonable.

Key words: rock dynamic fracture toughness, dynamic stress intensity factor, pre-cracked chevron notched Brazilian disc (P-CCNBD), experimental-numerical method, quasi-static method

CLC Number: 

  • TU 318
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