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2025 Vol.35, Issue 6 Preview Page

Original Article

Analysis of Dynamic Mode I Fracture Toughness of Granite Using the Short Rod(SR) Method

Short rod(SR) 방법을 이용한 화강암의 동적 Mode I 파괴인성 특성 분석

Gyeonggyu Kim12
,
Sewook Oh3*
,
Seungki Hong4
,
Byunghee Choi5
,
Myungsun Kim3
,
Sangho Cho67
김 경규12
,
오 세욱3*
,
홍 승기4
,
최 병희5
,
김 명선3
,
조 상호67
1Ph.D. Student, Deep Geological Disposal & Energy Storage Research Center, Korea Institute of Geosciences and Mineral Resources
2Ph.D. Student, Department of Energy Storage and Conversion Engineering, Jeonbuk National University
3Senior Researcher, Deep Geological Disposal & Energy Storage Research Center, Korea Institute of Geosciences and Mineral Resources
4Post-Doctroal Researcher, Deep Geological Disposal & Energy Storage Research Center, Korea Institute of Geosciences and Mineral Resources
5Principal Researcher, Deep Geological Disposal & Energy Storage Research Center, Korea Institute of Geosciences and Mineral Resources
6Professor, College of Civil, Environmental, and Resource and Energy Engineering, Jeonbuk National University
7Professor, Department of Energy Storage and Conversion Engineering, Jeonbuk National University
1한국지질자원연구원 방폐물심층처분연구센터 박사과정 연구생
2전북대학교 에너지저장‧변환공학과 박사과정
3한국지질자원연구원 방폐물심층처분연구센터 선임연구원
4한국지질자원연구원 방폐물심층처분연구센터 박사후연수자
5한국지질자원연구원 방폐물심층처분연구센터 책임연구원
6전북대학교 토목/환경/자원에너지공학부 교수
7전북대학교 에너지저장‧변환공학과 교수
*Corresponding Author
31 December 2025. pp. 843-862
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Abstract

This study evaluated the dynamic Mode I fracture toughness of Yeongju granite and Hwangdeung granite using a Split Hopkinson pressure bar (SHPB) system. Using the Short rod (SR) method, Yeongju granite exhibited fracture toughness values approximately 1.08~1.16 times higher than those of Hwangdeung granite. For both rock types, fracture toughness increased with loading rate and followed a power-law relationship. Regression analysis further showed that the loading rate sensitivity of Yeongju granite was approximately 1.1 times greater than that of Hwangdeung granite. The anisotropy factor decreased from static to dynamic loading, indicating that material anisotropy has a relatively small influence on fracture toughness under dynamic loading. Moreover, the crack opening displacement (COD) and crack opening velocity (COV) time histories were consistent with high speed camera images of crack propagation, confirming the reproducibility of crack opening and fracture behavior in the dynamic SR test.

Keywords
Split Hopkinson pressure bar(SHPB)
Dynamic Mode I fracture toughness
Short rod(SR) method
loading rate
Anisotropy

본 연구에서는 스플릿 홉킨슨 압력봉(SHPB) 시스템을 이용하여 영주 화강암과 황등 화강암의 동적 Mode I 파괴인성을 평가하였다. SR 방법 적용 결과, 영주 화강암의 파괴인성은 황등 화강암보다 약 1.08~1.16배 높게 나타났다. 두 암종 모두 하중속도 증가에 따라 파괴인성이 멱함수 형태로 증가하였으며, 회귀분석을 통해 영주 화강암의 하중속도 의존성이 황등 화강암보다 약 1.1배 큰 것으로 평가되었다. 하중조건이 정적에서 동적으로 변화함에 따라 이방성 지수는 감소하는 경향을 보였고, 이를 통해 동적 하중 조건에서는 재료 이방성이 파괴인성에 미치는 영향이 상대적으로 작음을 확인하였다. 또한, 균열개방변위 및 균열개방속도 이력곡선은 고속 카메라의 균열 전파 영상과 잘 일치하였고, 이를 통해 동적 SR 시험에서 균열 개방 및 파괴거동이 이상적으로 재현되었음을 확인하였다.

키워드
스플릿 홉킨슨 압력봉
동적 Mode I 파괴인성
SR 방법
하중속도
이방성
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 35
  • No :6
  • Pages :843-862
  • Received Date : 2025-12-10
  • Revised Date : 2025-12-19
  • Accepted Date : 2025-12-24
  • DOI :https://doi.org/10.7474/TUS.2025.35.6.843
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