Modeling solid materials in DEM using the micropolar theory (original) (raw)

The discrete element method (DEM) is a widely accepted method used in simulations of the powder sintering process, where the real object is replaced by a set of particles representing elastic-plastic material. Recently, this method has also been used to model solid materials. In this work, we present a local constitutive model for the determination of the interaction forces, which is based on micropolar theory. The model shows an elastoviscoplastic behavior, thus an adaptation of the Johnson-Cook description of flow stress, which allows the analysis of solid materials subjected to high strain rates. The results of the DEM simulations received after calibration of the model parameters agree well with the experimental data from literature.