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MM: Fachverband Metall- und Materialphysik
MM 28: Liquid and Amorphous Metals
MM 28.9: Vortrag
Mittwoch, 29. März 2023, 12:30–12:45, SCH A 118
An atomic scale inspired phase-field approach to model fracture in amorphous silica — •Gergely Molnar1, Gaylord Guillonneau2, Guillaume Kermouche3, and Etienne Barthel4 — 1Univ Lyon, CNRS, INSA Lyon, LaMCoS, UMR5259, 69621 Villeurbanne, France — 2Univ Lyon, Ecole Centrale de Lyon, CNRS, LTDS, UMR CNRS 5513, 69134 Ecully, France — 3Mines Saint-Etienne, CNRS, UMR 5307 LGF, Centre SMS, 42023 Saint Etienne, France — 4ESPCI, CNRS, SIMM, UMR7615, 75231 Paris, France
In the last decade, phase-field models have gained great popularity in fracture simulation. These models regularize the sharp crack using an internal length-scale by diffusing the damage into the material. This work was set out to investigate the competition between homogeneous plastic deformation, shear banding, and brittle failure in amorphous silica. The molecular dynamics inspired finite element model uses the phase-field approach to model fracture, while a pressure-dependent yield criterion accounts for densification and shear plasticity. The talk presents a proof of concept to model plasticity and crack propagation in micrometer size silica samples.