Numerical Study of Localized Deformation in Granular Materials by Discrete Element Method

Abstract eng:
Granular materials exhibit very complex behavior under external load. The macro- and micro-mechanical characteristics of granular assembly are strongly dependent on the properties of the constituent individual particles. The objective of this paper is to explore the deformation in microscale using discrete element method (DEM). Quasi-static biaxial compression test is carried out to investigate the structured deformation pattern. The simulation results show that the micro-scale deformation is nonuniform but not random or unrelated. The localized deformations represented by slip deformation in local void cells appear as microbands at small strain and shear bands at large strain. During the biaxial compression, the negative slip occurs in the neighboring regions of elastic unloading and plastic flow can occur along a plane of discontinuity in the velocity gradient field.

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