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A Study on the Damage Assesment of Artificial Brittle Materials subjected to Impact Leading  

Cho, Sang-Ho (전북대학교 자원에너지공학과)
Jo, Seul-Ki (전북대학교 자원에너지공학과)
Cheon, Dae-Sung (한국지질자원연구원)
Synn, Joong-Ho (한국지질자원연구원)
Yang, Hyung-Sik (전남대학교 건설지구환경공학부)
Kim, Seung-Kon (전북대학교 자원에너지공학과)
Publication Information
Tunnel and Underground Space / v.18, no.6, 2008 , pp. 457-464 More about this Journal
Abstract
Dynamic fracture mechanism of rock is important to improve rapid excavation method and develop precise damage assesment of rock mass in the vicinity of an excavation. In order to investigate dynamic fracture characteristics and dynamic damage mechanism of brittle materials, this study employed pulse shape-controlled Split Hopkinson Pressure Bar (SHPB) system. The P- and S-wave velocities of the tested samples were measured before and after tests to examine damage of the samples. The decay ratios of the Ultrasonic wave velocities increased with impart velocities and the samples which have lower strength showed higher permanent strain significantly.
Keywords
Dynamic fracture mechanism; Damage assesment; Split Hopkinson Pressure Bar (SHPB); Decay ratio of elastic wave velocity;
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