Prestudy - Hybrid Particle Breakage Model in DEM

Purpose and goal

A number of model types have previously been proposed for crushing rock materials in DEM. However, for simulation of crushing in large particle systems, the development has stagnated as the models are fundamentally limited by inferior resolution or too high computational load. In order for full-scale crushers to be simulated with good accuracy within reasonable time frames, a new model concept is required. The aim of the project is to carry out a needs analysis, develop consortium for full-scale project and develop the model concept from TRL level 2 to TRL 4 with demonstration in lab.

Expected results and effects

The model was developed from concept to implementation in C ++ code in the DEM software at FCC. New experimental equipment and methodology have been developed for controlled multi-contact crushing with the aim of guiding the model´s framework for breakage and crack propagation. A consortium has been initiated with three academic partners, three industrial partners and a new project application has been initiated. The project objectives are considered to have been met satisfactorily and the model shows a great potential to revolutionize the simulation of crushers in DEM.

Planned approach and implementation

The project has been planned into a set of work packages performed by male and female researchers at the FCC. Major focus has been on mathematical modeling, implementation of the algorithm´s various sub-operations in C ++ code, and integration and testing of the complete model. A work package has been carried out at Chalmers IMS where experiments have been developed to study the crushing process of individual particles when controlling the number and position of the contact points. The results form the basis of the algorithm´s simplified fracture mechanical model.