Abstract
The majority of publications in DEM use simplified particle shapes, in this study we use polyhedral shapes to determine the effect of particle shape on shear strength via a direct-shear test. Grain aspect ratio was found to be the primary determinant of shear strength with elongated polyhedra having a lower shear resistance. Grain irregularity also had a significant effect, shapes with isotropic contacts angles had the highest shear strength. The variability of granular material behavior due to shape was demonstrated by non-convex shapes re-orientating to jam in certain cases. Shapes with multi-stable packed orientations were found to offer the highest resistance to reordering under localized vibration.
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