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In Situ Scanning Electron Microscope (SEM) Observations of Damage and Crack Growth of Shale

文献类型：期刊论文

作者Cui, Zhendong1,2,3; Han, Weige1,2,3
刊名MICROSCOPY AND MICROANALYSIS
出版日期2018-04-01
卷号24期号:2页码:107-115
关键词in situ SEM observation micro/nanoscale damage crack growth shale gas
ISSN号1431-9276
DOI10.1017/S1431927618000211
文献子类Article
英文摘要To better understand the formation and evolution of hierarchical crack networks in shales, observations of microscopic damage, and crack growth were conducted using an in situ tensile apparatus inside a scanning electron microscope. An arched specimen with an artificial notch incised into the curved edge was shown to afford effective observation of the damage and crack growth process that occurs during the brittle fracturing of shale. Because this arched specimen design can induce a squeezing effect, reducing the tensile stress concentration at the crack tip, and preventing the brittle shale from unstable fracturing to some extent. Both induced and natural pores and cracks were observed at different scales around the main crack path or on fractured surfaces. Observations indicate that the crack initiation zone develops around the crack tip where tensile stresses are concentrated and micro/nanoscale cracks nucleate. Crack advancement generally occurs by the continuous generation and coalescence of damage zones having intermittent en echelon microscopic cracks located ahead of the crack tips. Mineral anisotropy and pressure build-up around crack tips causes crack kinking, deflection, and branching. Crack growth is often accompanied by the cessation or closure of former branch cracks due to elastic recovery and induced compressive stress. The branching and interactions of cracks form a three-dimensional hierarchical network that includes induced branch cracks having similar paths, as well as natural structures such as nanopores, bedding planes, and microscopic cracks.
WOS关键词ROCK ; COMPRESSION ; MORPHOLOGY ; BEHAVIORS ; MECHANICS ; BARNETT ; FAULTS
WOS研究方向Materials Science ; Microscopy
语种英语
WOS记录号WOS:000431405100004
出版者CAMBRIDGE UNIV PRESS
资助机构National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; National Natural Science Foundation of China(41202228) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Youth Project of Major State Basic Research Development Program (973 Program)(2015CB258500) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301) ; Strategic Priority Research Programs (Category B) of the Chinese Academy of Sciences(XDB10030301)
源URL[http://ir.iggcas.ac.cn/handle/132A11/88310]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Cui, Zhendong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Cui, Zhendong,Han, Weige. In Situ Scanning Electron Microscope (SEM) Observations of Damage and Crack Growth of Shale[J]. MICROSCOPY AND MICROANALYSIS,2018,24(2):107-115.
APA Cui, Zhendong,&Han, Weige.(2018).In Situ Scanning Electron Microscope (SEM) Observations of Damage and Crack Growth of Shale.MICROSCOPY AND MICROANALYSIS,24(2),107-115.
MLA Cui, Zhendong,et al."In Situ Scanning Electron Microscope (SEM) Observations of Damage and Crack Growth of Shale".MICROSCOPY AND MICROANALYSIS 24.2(2018):107-115.

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来源：地质与地球物理研究所

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