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Experimental study of the dynamic fracture toughness of anisotropic black shale using notched semi-circular bend specimens
Shi, Xiaoshan1,2,3; Yao, Wei4; Liu, Da'an1,2; Xia, Kaiwen4; Tang, Tiewu1,2,3; Shi, Yirui4
2019
发表期刊ENGINEERING FRACTURE MECHANICS
ISSN0013-7944
卷号205页码:136-151
摘要This paper investigates the dynamic fracture toughness anisotropy of black shale (BS). Notched semi-circular bend (NSCB) BS specimens are prepared with different loading angles (the angle between the stratification plane and the loading direction). NSCB specimens are dynamically loaded using a modified split Hopkinson pressure bar (SHPB) system. Formulae for calculating mode-I fracture toughness of transversely isotropic material are obtained by finite element method (FEM) in combination with the J-integral method. Dynamic fracture toughness of the NSCB sample is calculated using stress waves recorded in SHPB tests and the obtained formulae. The results show that the fracture toughness of specimens for all loading angles exhibits obvious loading rate dependence, with the fracture toughness increasing with the loading rate. Similar to the static case, the specimens with higher loading angle have larger fracture toughness values as compared with ones with lower loading angles under similar loading rates. We proposed two envelope lines to enclose the fracture toughness of specimens under different loading rate. The difference between two envelope lines decreases with the increase of the loading rate. The anisotropy of black shale diminishes under extreme high loading rate. Anisotropy index, defined as the ratio of the maximum to the minimum of fracture toughness, is equal to 1.75 under static loading and 1.52 under smaller dynamic loading. These conclusions may have significant implications to the design of hydraulic fracturing in shales, e.g., fracture fluids pumping could be considered as static loading and perforation can be considered as dynamic loading. The anisotropy of shales should be considered in both these cases.
关键词Black shale Dynamic fracture toughness NSCB SHPB Anisotropy index
DOI10.1016/j.engfracmech.2018.11.027
资助者Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC)
关键词[WOS]SUGGESTED METHODS ; RATE DEPENDENCE ; ROCK FATIGUE ; STRAIN-RATE ; STRENGTH ; MECHANISM ; BEHAVIOR ; COMPRESSION ; PROPAGATION ; SENSITIVITY
语种英语
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDB10050201] ; National Natural Science Foundation of China[41602330] ; National Natural Science Foundation of China[41807254] ; Natural Sciences and Engineering Research Council of Canada (NSERC)[72031326]
资助者Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; Natural Sciences and Engineering Research Council of Canada (NSERC)
WOS研究方向Mechanics
WOS类目Mechanics
WOS记录号WOS:000453766000012
出版者PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90276
专题页岩气与地质工程院重点实验室
通讯作者Xia, Kaiwen
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, KLSGG, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
4.Univ Toronto, Dept Civil Engn, Toronto, ON M5S 1A4, Canada
推荐引用方式
GB/T 7714
Shi, Xiaoshan,Yao, Wei,Liu, Da'an,et al. Experimental study of the dynamic fracture toughness of anisotropic black shale using notched semi-circular bend specimens[J]. ENGINEERING FRACTURE MECHANICS,2019,205:136-151.
APA Shi, Xiaoshan,Yao, Wei,Liu, Da'an,Xia, Kaiwen,Tang, Tiewu,&Shi, Yirui.(2019).Experimental study of the dynamic fracture toughness of anisotropic black shale using notched semi-circular bend specimens.ENGINEERING FRACTURE MECHANICS,205,136-151.
MLA Shi, Xiaoshan,et al."Experimental study of the dynamic fracture toughness of anisotropic black shale using notched semi-circular bend specimens".ENGINEERING FRACTURE MECHANICS 205(2019):136-151.
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