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Abstract: We report experimental measurements on the rheology of a dry granularmaterial under a weak level of vibration generated by sound injection. First,we measure the drag force exerted on a wire moving in the bulk. We show thatwhen the driving vibration energy is increased, the effective rheology changesdrastically: going from a non-linear dynamical friction behavior - weaklyincreasing with the velocity- up to a linear force-velocity regime. We presenta simple heuristic model to account for the vanishing of the stress dynamicalthreshold at a finite vibration intensity and the onset of a linearforce-velocity behavior. Second, we measure the drag force on sphericalintruders when the dragging velocity, the vibration energy, and the diametersare varied. We evidence a so-called -geometrical hardening- effect forsmaller size intruders and a logarithmic hardening effect for the velocitydependence. We show that this last effect is only weakly dependent on thevibration intensity.



Author: G. A. Caballero-Robledo, E. Clément

Source: https://arxiv.org/







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