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| Experimental Study on the Effect of Loading Rate for Dynamic Fracture Toughness of Rock |
| GONG Neng-Ping, LUO Yu-Fan, GAO Yuan |
| (Institute of Applied Mechanics, Anhui University of Science and Technology, Huainan 232001, China) |
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Abstract By using CCCD-SHPB (central cracked circular disksplit Hopkinson pressure bar) test system the pure type Ι loading tests of granite samples under different loading rate were carried out, the relationship between the average loading curvesP(t)and time was measured. The things gained above are used in the promoted central cracked circle disk specimen stress intensity factors calculation formula to obtain the dynamic fracture toughness of the granite under different loading rates and reveal the relationship between loading rate and dynamic fracture toughness. The results show that in the loading rate range from 50 to 350 GPa·m1/2/s, the fracture toughness has a linear upward trend with the increase of loading rate.
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Received: 04 November 2011
Published: 30 October 2012
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