Approaches for Accurate Modeling of Particle Attrition in DEM Simulations

The accurate modeling of particle attrition and breakage in a Discrete Element Model (DEM) are critical in the performance prediction of processes such as high-pressure grinding rolls, cone crusher and mills. These simulations need to consider the reduction in the particle size and subdivision of particles into smaller fragments, which provide significant numerical and programing challenges. The presentation focuses on two approaches for these type of DEM breakage simulations – instantaneous and discrete grain breakage. The instantaneous breakage model treats every particles as a single entity and breaks it into fragments instantaneously based on force or energy breakage criterion. On the other hand, the discrete grain breakage approach uses elementary particles to be “glued” together by a virtual “glue” that can withstand tensile forces up to a threshold limit before breakage occurs. Advantages and disadvantages of both these methods will be presented. In addition, approaches for particles attrition simulations and simulations of boundary attrition caused by particles interactions will also be considered.