Abstract
AbstractThe structure of persistent and transient shear bands in granular materials by experimental modeling a quite idealized assembly of two‐dimensional particles, Taylor‐Schneebeli (T‐S) material, is investigated. Flexible stress‐controlled boundaries make possible biaxial compression test (samples 100 cm high and 30‐100 cm wide), i.e. they avoid constraining the motion of particles within the shear bands. The displacement, volumetric strain, void ratio, rotation of the particles, rotation of their neighborhoods can be examined within the shear bands. The importance of particle's rotations inside shear bands can justify the micropolar description of granular materials. For measurement at the microstructure level a conventional digital video technique is used. New digital image processing (DIP) techniques are used for analysis at the microscopic level, giving localization, displacements and rotations of each T‐S rods. Short description of a new plane strain experimental stand and an example of DIP analysis for a selected experimental test are presented. Some comments due to the mathematical model description of granular bodies is also given.
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