Shear fractures in anisotropic ductile materials: an experimental approach

Analogue models have been used to investigate the influence of planar mechanical anisotropy on the orientation of shear fractures in an elastoviscous-brittle material. Multilayered models consisting of a mixture of plasticine, vaseline and preferentially-oriented paper flakes have been coaxially def...

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Detalles Bibliográficos
Autores: Gómez Rivas, Enrique, Griera i Artigas, Albert
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2012
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/201760
Acceso en línea:https://hdl.handle.net/2445/201760
Access Level:acceso abierto
Palabra clave:Anisotropia
Geologia estructural
Anisotropy
Structural geology
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spelling Shear fractures in anisotropic ductile materials: an experimental approachGómez Rivas, EnriqueGriera i Artigas, AlbertAnisotropiaGeologia estructuralAnisotropyStructural geologyAnalogue models have been used to investigate the influence of planar mechanical anisotropy on the orientation of shear fractures in an elastoviscous-brittle material. Multilayered models consisting of a mixture of plasticine, vaseline and preferentially-oriented paper flakes have been coaxially deformed for this purpose. The evolution of the orientation, length and connectivity of fracture sets has been systematically analysed with progressive coaxial deformation. The experimental results show that the orientation of fractures with respect to the deformation axes depends on the orientation of transverse anisotropy. Two symmetrical sets of shear fractures are formed in models with layering parallel to the extension axis X, while the fracture network is asymmetrical with respect to the deformation axes for cases with oblique anisotropy. The average dihedral angles between fracture sets are higher than 100°, with the obtuse bisector between the two sets oriented perpendicular to layers. The stress fields calculated from fracture data differ from the boundary conditions applied by the deformation apparatus. This misorientation is related to the degree of anisotropy. In models with high oblique anisotropy both fracture arrays rotate in a dextral sense together with layers towards the X-axis, indicating that the presence of a strong anisotropy controls their evolution with progressive deformation.Elsevier Ltd2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/201760Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1016/j.jsg.2011.10.007Journal of Structural Geology, 2012, vol. 34, num. 1, p. 61-76https://doi.org/10.1016/j.jsg.2011.10.007(c) Elsevier Ltd, 2012info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2017602026-05-27T06:46:51Z
dc.title.none.fl_str_mv Shear fractures in anisotropic ductile materials: an experimental approach
title Shear fractures in anisotropic ductile materials: an experimental approach
spellingShingle Shear fractures in anisotropic ductile materials: an experimental approach
Gómez Rivas, Enrique
Anisotropia
Geologia estructural
Anisotropy
Structural geology
title_short Shear fractures in anisotropic ductile materials: an experimental approach
title_full Shear fractures in anisotropic ductile materials: an experimental approach
title_fullStr Shear fractures in anisotropic ductile materials: an experimental approach
title_full_unstemmed Shear fractures in anisotropic ductile materials: an experimental approach
title_sort Shear fractures in anisotropic ductile materials: an experimental approach
dc.creator.none.fl_str_mv Gómez Rivas, Enrique
Griera i Artigas, Albert
author Gómez Rivas, Enrique
author_facet Gómez Rivas, Enrique
Griera i Artigas, Albert
author_role author
author2 Griera i Artigas, Albert
author2_role author
dc.subject.none.fl_str_mv Anisotropia
Geologia estructural
Anisotropy
Structural geology
topic Anisotropia
Geologia estructural
Anisotropy
Structural geology
description Analogue models have been used to investigate the influence of planar mechanical anisotropy on the orientation of shear fractures in an elastoviscous-brittle material. Multilayered models consisting of a mixture of plasticine, vaseline and preferentially-oriented paper flakes have been coaxially deformed for this purpose. The evolution of the orientation, length and connectivity of fracture sets has been systematically analysed with progressive coaxial deformation. The experimental results show that the orientation of fractures with respect to the deformation axes depends on the orientation of transverse anisotropy. Two symmetrical sets of shear fractures are formed in models with layering parallel to the extension axis X, while the fracture network is asymmetrical with respect to the deformation axes for cases with oblique anisotropy. The average dihedral angles between fracture sets are higher than 100°, with the obtuse bisector between the two sets oriented perpendicular to layers. The stress fields calculated from fracture data differ from the boundary conditions applied by the deformation apparatus. This misorientation is related to the degree of anisotropy. In models with high oblique anisotropy both fracture arrays rotate in a dextral sense together with layers towards the X-axis, indicating that the presence of a strong anisotropy controls their evolution with progressive deformation.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/201760
url https://hdl.handle.net/2445/201760
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.jsg.2011.10.007
Journal of Structural Geology, 2012, vol. 34, num. 1, p. 61-76
https://doi.org/10.1016/j.jsg.2011.10.007
dc.rights.none.fl_str_mv (c) Elsevier Ltd, 2012
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Elsevier Ltd, 2012
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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