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We perform extensive molecular dynamics simulations of dense liquids composedof bidisperse dimer- and ellipse-shaped particles in 2D that interact viarepulsive contact forces. We measure the structural relaxation times obtainedfrom the long-time decay of the self-part of the intermediate scatteringfunction for the translational and rotational degrees of freedom (DOF) as afunction of packing fraction \phi, temperature T, and aspect ratio \alpha. Weare able to collapse the \phi and T-dependent structural relaxation times fordisks, and dimers and ellipses over a wide range of \alpha, onto a universalscaling function {\cal F}_{\pm}(|\phi-\phi_0|,T,\alpha), which is similar tothat employed in previous studies of dense liquids composed of purely repulsivespherical particles in 3D. {\cal F_{\pm}} for both the translational androtational DOF are characterized by the \alpha-dependent scaling exponents \muand \delta and packing fraction \phi_0(\alpha) that signals the crossover inthe scaling form {\cal F}_{\pm} from hard-particle dynamics to super-Arrheniusbehavior for each aspect ratio. We find that the fragility at \phi_0,m(\phi_0), decreases monotonically with increasing aspect ratio for bothellipses and dimers. Moreover, the results for the slow dynamics of denseliquids composed of dimer- and ellipse-shaped particles are qualitatively thesame, despite the fact that zero-temperature static packings of dimers areisostatic, while static packings of ellipses are hypostatic.

Rods are less fragile than spheres: Structural relaxation in dense liquids composed of anisotropic particles