A micromechanical study is made of the relationship between interparticle friction coefficient μ and macroscopic continuum friction and dissipation in idealised granular materials, using Discrete Element Method simulations with varying μ. As expected, macroscopic friction and dilatancy increase with μ. Surprisingly, dissipation is present even when μ→0 or when μ→∞. Hence, dissipation in idealised granular materials is not exclusively the result of interparticle friction. The dependence of the dissipation-rate function on plastic strains is also investigated.
展开▼
