Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Granular Matter

DY 3.2: Vortrag

Montag, 7. März 2016, 10:00–10:15, H46

Mechanical properties of cohesive granular materials — •Arnaud Hemmerle, Matthias Schröter, and Lucas Goehring — Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany

Understanding the mechanical properties of cohesive granular materials is important for various problems such as fracturing of rocks, fluid invasion, or seismology. By mixing glass beads with a curable elastic polymer, we create well-defined cohesive granular media, held together by solid capillary bridges. The mechanical response and the toughness of this model material can be tuned over a broad range by adjusting the strength and stiffness of the bridges, as well as the size and cohesion of its constituents. We thoroughly characterized the mechanical properties of this model cohesive granulate for various bead sizes, volume fractions of polymer, and polymer stiffnesses to show the range of behaviors allowed, and their scaling. Using in situ stress-strain tests combined with X-ray micro-tomography, we investigated the links between these macroscopic properties and the microscopic modes of deformation, for example the elongation and the bending of connected neighboring beads.

Along with these fundamental studies of the mechanical response of this model system, we will briefly discuss potential applications of its customizable properties to geoengineering and biophysics, with, for example, investigations on biofouling and bio-deterioration.