| Issue |
EPL
Volume 116, Number 2, October 2016
|
|
|---|---|---|
| Article Number | 28007 | |
| Number of page(s) | 6 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/116/28007 | |
| Published online | 01 December 2016 | |
Experimental study of shear band formation: Bifurcation and localization
Université de Rennes 1, Institut de Physique de Rennes (UMR UR1-CNRS 6251) - Bât. 11A, Campus de Beaulieu, F-35042 Rennes, France
(a) axelle.amon@univ-rennes1.fr
Received: 31 August 2016
Accepted: 17 November 2016
We report the experimental observation of the bifurcation at the origin of localization of the deformation in a granular material submitted to uniaxial compression. We present a quantitative characterization of the heterogeneity in the strain field repartition allowing to evidence objectively the existence of a bifurcation initiating the shear bands formation process. We show that this bifurcation is supercritical and has no clear signature on the stress-strain curve. At the bifurcation, a symetry breaking occurs characterized by the emergence of a well-defined orientation corresponding to the Mohr-Coulomb angle. Yet, plasticity is still diffuse and the shear band extension is of the order of the sample width. While loading proceeds, the shear band narrows until it reaches, after the peak of the stress-strain curve, a stationary width.
PACS: 83.80.Fg – Granular solids / 91.55.Fg – Dynamics and mechanics of faulting / 81.40.Lm – Deformation, plasticity, and creep
© EPLA, 2016
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