Dresden 2020 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Granular Matter and Granular Dynamics I

DY 33.2: Talk

Wednesday, March 18, 2020, 10:00–10:15, ZEU 118

Tuning Mechanical Properties of Granular Matter Via Confinement — •Rishab Handa, Jorge Fiscina, and Christian Wagner — Department of Experimental Physics, Saarland University, Saarbruecken, Germany

We compare the high energy dissipation dynamics of dry and wet granular matter subjected to several degrees of confinement under large amplitude oscillatory shear (LAOS). Under confinement, the energy dissipated by dry grains was more pronounced than wet grains, at increasing strain rate. Scaling the elastic modulus of dry grains as a function of shear stress revealed a power law behavior, which we relate to the formation of filament-like force-chain networks. Contrarily, for wet granular matter, linear dependence of elastic modulus indicated the process of breaking and regeneration of capillary bridges, seemingly caused by non-affine motions of grains associated with the noise temperature. Therefore, we show that the degree of confinement can be used as a controlling parameter to adjust the mechanical properties of granular matter.