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In-situ synchrotron characterisation of fracture initiation and propagation in shales during indentation

Authors: Lin Ma; Anne-Laure Fauchille; M. Chandler; Patrick J. Dowey; Kevin G. Taylor; Julian Mecklenburgh; Peter D. Lee;

In-situ synchrotron characterisation of fracture initiation and propagation in shales during indentation

Abstract

Abstract The feasibility and advantages of synchrotron imaging have been demonstrated to effectively characterise fracture initiation and propagation in shales during indentation tests. These include 1) fast (minute-scale) and high-resolution (μm-scale) imaging of fracture initiation, 2) concurrent spatial and temporal information (4D) about fracture development, 3) quantification and modelling of shale deformation prior to fracture. Imaging experiments were performed on four shale samples with different laminations and compositions in different orientations, representative of three key variables in shale microstructure. Fracture initiation and propagation were successfully captured in 3D over time, and strain maps were generated using digital volume correlation (DVC). Subsequently, post-experimental fracture geometries were characterised at nano-scale using complementary SEM imaging. Characterisation results highlight the influence of microstructural and anisotropy variations on the mechanical properties of shales. The fractures tend to kink at the interface of two different textures at both macroscale and microscale due to deformation incompatibility. The average composition appears to provide the major control on hardness and fracture initiation load; while the material texture and the orientation of the indentation to bedding combine to control the fracture propagation direction and geometry. This improved understanding of fracture development in shales is potentially significant in the clean energy applications.

Country
United Kingdom
Subjects by Vocabulary

Microsoft Academic Graph classification: Materials science Indentation Texture (crystalline) Composite material Anisotropy Microscale chemistry Microstructure Fracture (geology) Deformation (engineering) Oil shale

Keywords

Fracture initiation, Fracture propagation, 0915 Interdisciplinary Engineering, Synchrotron characterisation, Industrial and Manufacturing Engineering, Electrical and Electronic Engineering, 4D, Civil and Structural Engineering, Energy, Mechanical Engineering, 0914 Resources Engineering and Extractive Metallurgy, Building and Construction, Shale, Pollution, General Energy, In-situ imaging, 0913 Mechanical Engineering

Aalto, P., Bilgin, M., Talus, K., 2017. The Political Economy Structures of Energy Transitions: from Shale Gas to Renewable Energy, Heading Towards Sustainable Energy Systems: Evolution or Revolution?, 15th IAEE European Conference, Sept 3-6, 2017. International Association for Energy Economics.

Abedi, S., Slim, M., Hofmann, R., Bryndzia, T., Ulm, F.-J., 2016. Nanochemomechanical signature of organic-rich shales: a coupled indentation-EDX analysis. Acta Geotechnica 11, 559-572. [OpenAIRE]

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    download downloads 61
  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    17
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
    Powered byBIP!BIP!
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
downloads
OpenAIRE UsageCountsDownloads provided by UsageCounts
17
Top 10%
Average
Top 10%
61
hybrid
Funded by
UKRI| Structural evolution across multiple time and length scales
Project
  • Funder: UK Research and Innovation (UKRI)
  • Project Code: EP/I02249X/1
  • Funding stream: EPSRC
,
EC| ShaleXenvironmenT
Project
ShaleXenvironmenT
Maximizing the EU shale gas potential by minimizing its environmental footprint
  • Funder: European Commission (EC)
  • Project Code: 640979
  • Funding stream: H2020 | RIA
iis
,
UKRI| Novel multi-scale 3D/4D characterization of pore networks in tight rocks: Enhanced understanding of clean gas extraction and safe carbon sequestration, UKRI| Shining light on shale: geomechanics and 4D fracture characterization
Project
  • Funder: UK Research and Innovation (UKRI)
  • Project Code: NE/M001458/1
  • Funding stream: NERC
iis
Related to Research communities
Sustainable Development Solutions Network - Greece
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