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We analyze the contact and force networks in a dense confined packing ofpentagonal particles simulated by means of the contact dynamics method. Theparticle shape effect is evidenced by comparing the data from pentagon packingand from a packing with identical characteristics except for the circular shapeof the particles. A surprising observation is that the pentagon packingdevelops a lower structural anisotropy than the disk packing. We show in thiswork that this weakness is compensated by a higher force anisotropy that leadsto enhanced shear strength of the pentagon packing. With the polygonal shape ofthe particles, the strong force chains are mostly composed of edge-to-edgecontacts with a marked zig-zag aspect.

Influence of particle shape on shear stress in granular media