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- W3200456412 abstract "Jammed disordered packings of non-spherical particles show significant variation in the packing density as a function of particle shape for a given packing protocol. Rotationally symmetric elongated shapes such as ellipsoids, spherocylinders, and dimers, e.g., pack significantly denser than spheres over a narrow range of aspect ratios, exhibiting a characteristic peak at aspect ratios of αmax ≈ 1.4-1.5. However, the structural features that underlie this non-monotonic behaviour in the packing density are unknown. Here, we study disordered packings of frictionless dimers in three dimensions generated by a gravitational pouring protocol in LAMMPS. Focusing on the characteristics of contacts as well as orientational and translational order metrics, we identify a number of structural features that accompany the formation of maximally dense packings as the dimer aspect ratio α is varied from the spherical limit. Our results highlight that dimer packings undergo significant structural changes as α increases up to αmax manifest in the reorganisation of the contact configurations between neighbouring dimers, increasing nematic order, and decreasing local translational order. Remarkably, for α > αmax our metrics remain largely unchanged, indicating that the peak in the packing density is related to the interplay of structural rearrangements for α < αmax and subsequent excluded volume effects with unchanged structure for α > αmax." @default.
- W3200456412 created "2021-09-27" @default.
- W3200456412 creator A5020069255 @default.
- W3200456412 creator A5030148211 @default.
- W3200456412 date "2021-01-01" @default.
- W3200456412 modified "2023-09-23" @default.
- W3200456412 title "Structural analysis of disordered dimer packings" @default.
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- W3200456412 doi "https://doi.org/10.1039/d1sm00960e" @default.
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