Experimental Study on the Dynamic Damage Mechanism of Rocks Under Different Impact Loadings

단계적 충격하중에 의한 암석의 동적손상메커니즘에 관한 실험적 연구

  • 조상호 (전북대학교 자원에너지 공학과) ;
  • 조슬기 (전북대학교 자원에너지 공학과) ;
  • 김승곤 (전북대학교 자원에너지 공학과) ;
  • 박찬 (한국지질자원연구원) ;
  • 금자승비고 (일본 북해도대학교)
  • Published : 2009.12.31

Abstract

In order to investigate dynamic damage mechanism of brittle materials, Split Hopkinson Pressure Bar (SHPB) have been adapted to apply different impact levels to rocks in South Korea. High resolution X-ray Computed Tomography (CT) was used to estimate the damage in tested rock samples nondestructively. The cracks which are parallel to the loading axis are visible on the contact surface with the incident bar under lower level of impact. The surface cracks disappeared with increment of impact level due to confined effect between the incident bar and sample, while axial splitting are happened near the outer surface.

Keywords

Dynamic damage mechanism;Split Hopkinson pressure bar;Damage-controlled test;High resolution X-ray computed tomography

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