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Length Scales for Nonaffine Deformation in Localized, Granular Shear

Rechenmacher, Amy L. / Abedi, Sara

We offer experimental observations of meso-scale deformation and kinematic activity within sheared granular layers to investigate the nature and spatial periodicity of nonaffine displacement fields within shear bands in a granular material. Prismatic specimens of sands and glass beads are subjected to plane strain deformation in which zero-strain conditions are enforced by translucent glass walls. We use the Digital Image Correlation (DIC) to track movements of small, overlapping particle clusters. By subtracting a superimposed first-order shear displacement field from the observed non-affine displacement fields, co-rotational vortices appear and coordinate with previously-observed kinematic patterns. We undertake a preliminary assessment of the spatial periodicity of such patterns to glimpse the nature of an underlying length scale for granular material deformation.

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Length Scales for Nonaffine Deformation in Localized, Granular Shear

Rechenmacher, Amy L. / Abedi, Sara

We offer experimental observations of meso-scale deformation and kinematic activity within sheared granular layers to investigate the nature and spatial periodicity of nonaffine displacement fields within shear bands in a granular material. Prismatic specimens of sands and glass beads are subjected to plane strain deformation in which zero-strain conditions are enforced by translucent glass walls. We use the Digital Image Correlation (DIC) to track movements of small, overlapping particle clusters. By subtracting a superimposed first-order shear displacement field from the observed non-affine displacement fields, co-rotational vortices appear and coordinate with previously-observed kinematic patterns. We undertake a preliminary assessment of the spatial periodicity of such patterns to glimpse the nature of an underlying length scale for granular material deformation.

Length Scales for Nonaffine Deformation in Localized, Granular Shear

Rechenmacher, Amy L. / Abedi, Sara

We offer experimental observations of meso-scale deformation and kinematic activity within sheared granular layers to investigate the nature and spatial periodicity of nonaffine displacement fields within shear bands in a granular material. Prismatic specimens of sands and glass beads are subjected to plane strain deformation in which zero-strain conditions are enforced by translucent glass walls. We use the Digital Image Correlation (DIC) to track movements of small, overlapping particle clusters. By subtracting a superimposed first-order shear displacement field from the observed non-affine displacement fields, co-rotational vortices appear and coordinate with previously-observed kinematic patterns. We undertake a preliminary assessment of the spatial periodicity of such patterns to glimpse the nature of an underlying length scale for granular material deformation.

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Title:

Length Scales for Nonaffine Deformation in Localized, Granular Shear

Contributors:

Bonelli, Stéphane (editor) / Dascalu, Cristian (editor) / Nicot, François (editor) / Rechenmacher, Amy L. (author) / Abedi, Sara (author)

Published in:

Advances in Bifurcation and Degradation in Geomaterials ; Chapter: 8 ; 59-65

Springer Series in Geomechanics and Geoengineering

Publication date:

2011-05-28

Size:

7 pages

ISBN:

978-94-007-1421-2 , 978-94-007-1420-5

ISSN:

1866-8763 , 1866-8755

DOI:

https://doi.org/10.1007/978-94-007-1421-2_8

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Granular material , Shear bands , Non-affine deformation , Vortices , Length scales Engineering , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Geophysics and Environmental Physics

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