Length Scales for Nonaffine Deformation in Localized, Granular Shear Chapter uri icon

abstract

  • 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.

author list (cited authors)

  • Rechenmacher, A. L., & Abedi, S

complete list of authors

  • Rechenmacher, AL||Abedi, S

editor list (cited editors)

  • Bonelli, S., Dascalu, C., & Nicot, F.

Book Title

  • Advances in Bifurcation and Degradation in Geomaterials: Proceedings of the 9th International Workshop on Bifurcation and Degradation in Geomaterials

publication date

  • January 1, 2011 11:11 AM