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We probe the effects of particle shape on the global and local behavior of atwo-dimensional granular pillar, acting as a proxy for a disordered solid,under uniaxial compression. This geometry allows for direct measurement ofglobal material response, as well as tracking of all individual particletrajectories. In general, drawing connections between local structure and localdynamics can be challenging in amorphous materials due to lower precision ofatomic positions, so this study aims to elucidate such connections. We varylocal interactions by using three different particle shapes: discrete circulargrains (monomers), pairs of grains bonded together (dimers), and groups ofthree bonded in a triangle (trimers). We find that dimers substantiallystrengthen the pillar and the degree of this effect is determined byorientational order in the initial condition. In addition, while the threeparticle shapes form void regions at distinct rates, we find that anisotropiesin the local amorphous structure remain robust through the definition of ametric that quantifies packing anisotropy. Finally, we highlight connectionsbetween local deformation rates and local structure.

Anisotropic Particles Strengthen Granular Pillars under Compression