Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 25: Granular Matter / Contact Dynamics

DY 25.6: Talk

Wednesday, April 3, 2019, 11:00–11:15, H3

Estimation of 3D force chains for packings of soft, nearly frictionless hydrogels spheres — •Diego Sancho Martínez¹, Ralf Stannarius¹, Ahmed Ashour¹, Torsten Trittel¹, Tilo Finger¹, Maja Illig¹, and Tamas Börzsönyi² — ¹1Institute of Physics, Otto von Guericke University, Magdeburg, Germany — ²2Wigner Institute for Solid State Physics, Hungarian Academy of Sciences, Budapest, Hungary

Discharge of granular materials from hoppers has been extensively investigated in the past. Many factors affect the rheology of flow and discharge such as the shape of the hopper, the orifice geometry, or the characteristics of the granular material. We investigate soft and nearly frictionless hydrogels and compare them to hard spheres clogged in a 3D silo. By means of X-ray computed tomography, we determine the packing fractions and the contact numbers of soft and hard spheres. In addition, we estimate the force chains of hydrogel spheres randomly packed in a container. These forces were calculated as a function of the deformation induced in the granular material, the force chains form due to the increasing pressure with increasing fill high. The Janssen law is not effective for the soft and nearly frictionless materials.