Characterizing the evolving internal length scale in strain localization for cosserat media

The mechanical behaviour of granular materials under high plastic deformation is quite complex due to the fact that the granular assembly consists of discrete or discontinuous non-uniform particles. Each of the particles has its own mechanical behaviour, its micro-properties thus the soil mass behaviour is complex and in some cases the classical continuum theory fails to describe the real behaviour because granular materials behave as a continuum until failure where deformations begin to localize into a small but finite shear zone, which is called shear band. In order to deal with the strain non-uniformities and strain softening a proper solution is to use additional degrees of freedom or high order gradient terms.Geo-EngineeringGeotechnologyCivil Engineering and Geoscience