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Having accurate models for predicting the kinematics and dynamics of particulates, such as agricultural and food products, is important for effective engineering design of processes involving these materials.  The discrete element method (DEM) is well suited for such studies and has been used for several decades to investigate particulate systems.  In this talk, recent research involving the modeling of assemblies of rod- and plate-like particles will be presented.  Results from shear cell studies in which particle packing, orientation, deformation, and stresses will be shown.  In addition, methods for predicting the breakage of rigid and flexible fibers will also be discussed.