Frictional collapse of granular assemblies

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A constitutive model with microstructure evolution for flow of rate-independent granular materials (2011, result): “The η versus µ relation is consistent with data from other experimental or computational studies (Thornton 2000; Suiker & Fleck 2004; Ketterhagen et al. 2009).”
The importance of modelling ballast particle shape in the discrete element method (2006, result): “13, 14, 15, 16 and 17. This is consistent with 3D simulations using PFC by Suiker and Fleck [ 13 ] in which they showed that restricting particle rotation may substantially increase the overall frictional resistance of the spheres.”
Cohesive, frictional powders: contact models for tension (2008, background): “Rolling- and torsionresistance [62; 78; 2; 16; 44; 17] can play an important role in particle systems, since they also lead to torques, typically reducing the particles’ freedom to rotate.”
Predicting the flow mode from hoppers using the discrete element method (2009, methodology): “6(a) the results from Suiker and Fleck [43] are used for both the “with rotation” and “no rotation” curves.”
Discrete Element Method Analysis of Railtrack Ballast Degradation during Cyclic Loading (2006, background): “According and Suiker and Fleck [ 25 ] how much a granular material roll or slide is influenced by the frictional resistance between the particles.”