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| Titel |
Fracturing of ductile anisotropic multilayers: influence of material strength |
| VerfasserIn |
E. Gomez-Rivas, A. Griera, M.-G. Llorens |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 2 ; Nr. 6, no. 2 (2015-05-19), S.497-514 |
| Datensatznummer |
250115446
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| Publikation (Nr.) |
 copernicus.org/se-6-497-2015.pdf |
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| Zusammenfassung |
| Fractures in rocks deformed under dominant ductile conditions typically form
simultaneously with viscous flow. Material strength plays a fundamental role
during fracture development in such systems, since fracture propagation can
be strongly reduced if the material accommodates most of the deformation by
viscous flow. Additionally, the degree and nature of anisotropy can
influence the orientation and type of resulting fractures. In this study,
four plasticine multilayer models have been deformed under coaxial boundary
conditions to investigate the influence of strength and anisotropy on the
formation of fracture networks. The experiments were made of different
mixtures and had two types of anisotropy: composite and composite-intrinsic.
The transition from non-localised deformation to systems where fracture
networks control deformation accommodation is determined by the ability of
the material to dissipate the external work and relax the elastic strain
during loading either by viscous flow or by coeval flow and failure.
Tension cracks grow in experiments with composite anisotropy, giving rise to
a network of shear fractures when they collapse and coalesce with
progressive deformation. The presence of an additional intrinsic anisotropy
enhances the direct nucleation of shear fractures, the propagation and
final length of which depend on the rigidity of the medium. Material strength
increases the fracture maximum displacement (dmax) to fracture length
(L) ratio, and the resulting values are significantly higher than those from
fractures in elastic–brittle rocks. This can be related to the low
propagation rates of fractures in rocks undergoing ductile deformation. |
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