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By means of contact dynamic simulations, we investigate the contact networktopology and force chains in two-dimensional packings of elongated particlesmodeled by rounded-cap rectangles. The morphology of large packings ofelongated particles in quasistatic equilibrium is complex due to the combinedeffects of local nematic ordering of the particles and orientations of contactsbetween particles. We show that particle elongation affects force distributionsand force/fabric anisotropy via various local structures allowed by stericexclusions and the requirement of force balance. As a result, the forcedistributions become increasingly broader as particles become more elongated.Interestingly, the weak force network transforms from a passive stabilizingagent with respect to strong force chains to an active force-transmittingnetwork for the whole system. The strongest force chains are carried byside/side contacts oriented along the principal stress direction.

Force chains and contact network topology in packings of elongated particles