컴팩트 시험편을 이용한 암석의 모드 I 파괴인성 측정 및 시험편의 크기와 재하속도가 파괴인성에 미치는 영향
Determination of the mode I fracture toughness of rock using the compact tension specimen and the effect of specimen size and loading rate on the fracture toughness
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The fracture toughness is a quantitative expression of a material resistance to failure and it is an important parameter in fracture mechanics. The fracture toughness can be used in many rock mechanics applications such as blasting, hydraulic fracturing, and excavation. In this study the mode I fracture toughness of Coconino sandstone is determined using the Compact Tension (CT) type specimens. A new stress intensity factor formula for the CT specimen is developed using the finite element program, FRANC2D/L. The effects of the specimen size and the loading rate on the fracture toughness are also investigated. Three specimen sizes are used for the size effect and four loading rates are employed for the loading rate effect. The experimental results show that the fracture toughness increases with increasing specimen size. Also, the fracture toughness increases with increasing loading rate.
Abstract
The fracture toughness is a quantitative expression of a material resistance to failure and it is an important parameter in fracture mechanics. The fracture toughness can be used in many rock mechanics applications such as blasting, hydraulic fracturing, and excavation. In this study the mode I fracture toughness of Coconino sandstone is determined using the Compact Tension (CT) type specimens. A new stress intensity factor formula for the CT specimen is developed using the finite element program, FRANC2D/L. The effects of the specimen size and the loading rate on the fracture toughness are also investigated. Three specimen sizes are used for the size effect and four loading rates are employed for the loading rate effect. The experimental results show that the fracture toughness increases with increasing specimen size. Also, the fracture toughness increases with increasing loading rate.
참고문헌 (14)
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