Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 28: Poster - Complex Fluids, Granular Matter, Glasses
DY 28.7: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster C
Fracturing of a model cohesive porous medium — •Alexander Schmeink, Arnaud Hemmerle, and Lucas Goehring — Max-Planck-Institiute for Dynamics and Self-Organisation (MPIDS), 37077 Göttingen. Germany
Understanding the way cohesive porous materials fracture is essential in quantifying the mechanical contributions to phenomena like the deterioration of man-made structures, biogenic fracture of rocks, hydraulic fracture, and CO2-Sequestration. Our goal is to characterize the fracture toughness of a cohesive porous medium in order to analyse the initiation of cracks in such situations. We designed a model porous medium made of glass beads held together by polydimethylsiloxane (PDMS). The cohesion of this medium can be controlled by curing conditions and crosslinking of the PDMS. In addition, the shape of bridges can be tuned by varying the amount of PDMS added to the beads. One advantage of this material is the fact that it can be molded into any desired shape. In order to analyze the initiation and propagation of cracks, we are conducting standard fracture toughness tests which have high requirements on the geometry of a tested specimen. We observe the fracture toughness of our material in dependence of parameters of its composition, such as polymer content, polymer composition, packing fraction, and bead diameter.