Post-yield Strength and Dilatancy Evolution Across the Brittle-Ductile Transition in Indiana Limestone.
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| Title: | Post-yield Strength and Dilatancy Evolution Across the Brittle-Ductile Transition in Indiana Limestone. |
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| Authors: | Walton, G.1 gwalton@mines.edu, Hedayat, A.1, Kim, E.1, Labrie, D.2 |
| Source: | Rock Mechanics & Rock Engineering. Jul2017, Vol. 50 Issue 7, p1691-1710. 20p. |
| Subjects: | Limestone, Mass mobilization, Carbonate rocks, Sedimentary rocks, Volumetric analysis |
| Abstract: | An extensive uniaxial and triaxial compression testing programme was performed on Indiana Limestone to assess its behaviour across the brittle-ductile transition. Particular attention has been paid to the post-yield evolution of strength and dilatancy. Specimens tested at σ = 30 MPa displayed a fully ductile failure mechanism, whereas specimens tested at σ = 15 MPa and σ = 20 MPa displayed transitional mechanisms, which were neither fully brittle nor fully ductile. Based on an examination of failure localization and dilatancy characteristics, the stress at which crack volumetric strain begins to increase was found to be an indicator of individual specimen ductility. In contrast to less porous rocks, the reversal of total volumetric strain did not coincide with the onset of axial strain nonlinearity under unconfined conditions. With respect to post-yield strength, a major change in the rate of friction mobilization relative to plastic shear strain was observed across the brittle-ductile transition. The dilatancy of the specimens was also found to undergo a major change, with the plastic shear strains to mobilization of peak dilatancy in the ductile regime being approximately one order of magnitude higher than in the brittle regime. [ABSTRACT FROM AUTHOR] |
| Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Post-yield Strength and Dilatancy Evolution Across the Brittle-Ductile Transition in Indiana Limestone. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Walton%2C+G%2E%22">Walton, G.</searchLink><relatesTo>1</relatesTo><i> gwalton@mines.edu</i><br /><searchLink fieldCode="AR" term="%22Hedayat%2C+A%2E%22">Hedayat, A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kim%2C+E%2E%22">Kim, E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Labrie%2C+D%2E%22">Labrie, D.</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Rock+Mechanics+%26+Rock+Engineering%22">Rock Mechanics & Rock Engineering</searchLink>. Jul2017, Vol. 50 Issue 7, p1691-1710. 20p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Limestone%22">Limestone</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+mobilization%22">Mass mobilization</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonate+rocks%22">Carbonate rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Sedimentary+rocks%22">Sedimentary rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Volumetric+analysis%22">Volumetric analysis</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: An extensive uniaxial and triaxial compression testing programme was performed on Indiana Limestone to assess its behaviour across the brittle-ductile transition. Particular attention has been paid to the post-yield evolution of strength and dilatancy. Specimens tested at σ = 30 MPa displayed a fully ductile failure mechanism, whereas specimens tested at σ = 15 MPa and σ = 20 MPa displayed transitional mechanisms, which were neither fully brittle nor fully ductile. Based on an examination of failure localization and dilatancy characteristics, the stress at which crack volumetric strain begins to increase was found to be an indicator of individual specimen ductility. In contrast to less porous rocks, the reversal of total volumetric strain did not coincide with the onset of axial strain nonlinearity under unconfined conditions. With respect to post-yield strength, a major change in the rate of friction mobilization relative to plastic shear strain was observed across the brittle-ductile transition. The dilatancy of the specimens was also found to undergo a major change, with the plastic shear strains to mobilization of peak dilatancy in the ductile regime being approximately one order of magnitude higher than in the brittle regime. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00603-017-1195-1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 20 StartPage: 1691 Subjects: – SubjectFull: Limestone Type: general – SubjectFull: Mass mobilization Type: general – SubjectFull: Carbonate rocks Type: general – SubjectFull: Sedimentary rocks Type: general – SubjectFull: Volumetric analysis Type: general Titles: – TitleFull: Post-yield Strength and Dilatancy Evolution Across the Brittle-Ductile Transition in Indiana Limestone. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Walton, G. – PersonEntity: Name: NameFull: Hedayat, A. – PersonEntity: Name: NameFull: Kim, E. – PersonEntity: Name: NameFull: Labrie, D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 07232632 Numbering: – Type: volume Value: 50 – Type: issue Value: 7 Titles: – TitleFull: Rock Mechanics & Rock Engineering Type: main |
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