A Multiscale Investigation of Strain Localization in Cohesionless Sand
We develop a hybrid finite-discrete element method (FEM/DEM) multiscale framework to model strain localization in cohesionless sand. This framework takes advantage of a hierarchical solution structure based on the two numerical techniques, by modeling the material as a continuum at large using FEM and deriving the material point response of the FEM mesh from a DEM assembly attached to each integration point. In doing so, the phenomenological assumptions on the macroscopic constitutive law in conventional continuum modeling can be naturally bypassed. We demonstrate the predictive capability of the model by simulating a biaxial compression test on sand where strain localization is observed. The influences of different boundary conditions on the shear band pattern are examined.
This work was supported by RGC HK (Grant No. 623609).
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