Modelling the compaction of plastic particle packings

Soft particle materials such as some pharmaceutical and food products are composed of particles that can undergo large deformations under low confining pressures without rupture. The rheological textural properties these thus governed by both rearrangements shape changes. For the simulation soft materials, we present a numerical technique based on material point method, allowing for elasto-plastic deformations. Coupling latter with contact dynamics method makes it possible to deal interactions between particles. We investigate compaction assemblies elastic plastic deformations, is observed applied stress needed achieve high packing fraction lower when hardening small. Moreover, predictive models, relating fraction, proposed These models fit well our results. Furthermore, found evolution coordination number follows power law function beyond jamming hard packings.