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| SHPB EXPERIMENTAL STUDY OF SERICITE-QUARTZ SCHIST AND SANDSTONE |
| LIU Shi1，XU Jinyu1，2，LIU Junzhong1，LU Xiaocong3 |
(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；
3. Airport and Barracks Office，Air Force Logistics Ministry of Beijing Military Area，Beijing 100005，China) |
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Abstract By using the hydraulic and servo-controlled pressure testing machine and the split Hopkinson pressure bar(SHPB) testing apparatus of 100 mm in diameter，which is improved by pulse shaping technique，the experimental tests of sericite-quartz schist and sandstone with strain rate varying from 50–160 s－1 under shock compression loading are carried out to study the quasi-static mechanical properties and relationship among wavy curves，dynamic compressive strength，specific energy absorption and strain rate effect of fracture forms of the two rocks. The experimental results show that the dynamic compressive strength，specific energy absorption and fracture forms of sericite-quartz schist and sandstone have significant correlation with strain rate. However，there is no significant correlation with strain rate can be seen for elastic moduli of the two rocks. The dynamic mechanical comparison results of sericite-quartz schist and sandstone show that sandstone is more sensitive to strain rate than sericite-quartz schist. In the sight of microstructure characteristics and energy absorption of sericite-quartz schist and sandstone，dynamic fracture process is analyzed；and crucial factors influencing the characteristics of fracture are discussed. The research method and conclusions can provide references for analyzing dynamic mechanical behavior of other kinds of brittle materials.
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Received: 08 April 2011
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2011, Vol. 30 
