An Experimental Study on the Determination of Shale K IC by Semi-Disk Three-Point Bending

Hongjian Wang, Wenchang Zhang, Zijiang Zhao (), Zhendong Cui (), Jian Li and Hao Zeng
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Hongjian Wang: Research Institute of Petroleum Engineering Technology, Zhongyuan Oilfield Branch of Sinopec, Puyang 457000, China
Wenchang Zhang: Research Institute of Petroleum Engineering Technology, Zhongyuan Oilfield Branch of Sinopec, Puyang 457000, China
Zijiang Zhao: China Railway Bridge Engineering Bureau Group Co., Ltd., Tianjin 300300, China
Zhendong Cui: Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Jian Li: Research Institute of Petroleum Engineering Technology, Zhongyuan Oilfield Branch of Sinopec, Puyang 457000, China
Hao Zeng: Research Institute of Petroleum Engineering Technology, Zhongyuan Oilfield Branch of Sinopec, Puyang 457000, China

Sustainability, 2023, vol. 15, issue 3, 1-14

Abstract: In order to accurately test the K IC of the vertical stratification direction of shale, a semi-circular bending specimen with a linear chevron notch ligament (LCNSCB) was designed. The minimum dimensionless stress intensity factor ( Y * min ) of the LCNSCB specimen was calculated by the finite element method and the slice synthesis method, respectively. Two sets of prefabricated samples of the LCNSCB specimen under arrester and divider mode were used to conduct three-point bending loading experiments. The dispersion of the measured K IC value of the specimens was analyzed by standard deviation and coefficient of variation, and the reason that the K IC dispersion of specimens in divider mode was larger than in arrester mode was discussed. Compared with the experimental data of the existing literature, the data of this experiment shows that the LCNSCB specimen can avoid the disadvantage of lower measured K IC values due to a larger fracture processing zone featured in the CSTSCB and CCNBD specimens, combined with the merits of a shorter fracture processing zone of the SR or CR specimens, and the render measured the K IC value to be closer to the material’s true fracture toughness value. The narrow ligament of the LCNSCB specimen has a favorable crack propagation guiding effect, can generate consistent K IC values, and could be used to accurately test the fracture toughness of rock material in vertical bedding direction.

Keywords: shale; mode-I fracture toughness; three-point bending; LCNSCB; stress intensity factor (SIF); dimensionless stress intensity factor Y * (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:15:y:2023:i:3:p:1863-:d:1040158

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