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Localised deformation patterning in 2D granular materials revealed by digital image correlation

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Author

  • Stephen Hall
  • David Muir Wood
  • Erdin Ibraim
  • Gioacchino Viggiani

Summary, in English

Tests have been performed on an analogue two-dimensional granular material in a special laboratory apparatus that allows the application of general stress or strain conditions. Digital image correlation of pairs of consecutive photographs taken during the tests has enabled fields of displacement and hence strain to be determined. Thus direct observation of internal displacements and strains has been possible for a series of general strain increments with different orientations of principal strain and different imposed angles of dilation. This analysis has successfully provided clear evidence of evolving internal structures of deformation. The observed evolving structures consist of bands of localised deformation and 'cells' of low deformation between the bands. The orientations of the identified localised features and cells are seen to depend on the applied strain path. The characteristic features and dimensions of the bands have been approximately identified.

Publishing year

2010

Language

English

Pages

1-14

Publication/Series

Granular Matter

Volume

12

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Mechanical Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-7636