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| ANALYSIS OF ENERGY DISSIPATION RULE DURING DEFORMATION AND FRACTURE PROCESS OF ROCK UNDER HIGH TEMPERATURES
IN SHPB TEST |
| XU Jinyu1，2，LIU Shi1 |
(1. Department of Airfield and Building Engineering，Air Force Engineering University，Xi?an，Shaanxi 710038，China；
2. College of Mechanics and Civil Architecture，Northwest Polytechnic University，Xi?an，Shaanxi 710072，China) |
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Abstract Experimental studies of marble under different high temperatures and impact load are carried out by using the high temperature split Hopkinson pressure bar(SHPB) apparatus of 100 mm in diameter. The characteristics of energy dissipation and the influence of impact velocity and incident energy on the energy dissipation of marble during the impact process are analyzed. The relationships between the fractal dimension，average fragment-size and energy dissipation of marble are also investigated. The test results show that the specific energy absorption increases linearly as the impact velocity and incident energy increase at the same high temperature. Meanwhile，the fractal dimension increases linearly and the average fragment-size decreases exponentially with the specific energy absorption increasing. Under the same high temperature，the greater the specific energy absorption is，the smaller the average fragment-size is，the greater the fractal dimension is，the more severe fragmentation is. Consequently，the deformation and fracture process of marble can be reasonably reflected from the viewpoint of energy dissipation.
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Received: 24 May 2012
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2013, Vol. 32 
