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MM: Fachverband Metall- und Materialphysik
MM 58: Liquid and Amorphous Metals
MM 58.7: Vortrag
Donnerstag, 15. März 2018, 13:15–13:30, TC 010
A mesoscopic study of plastic damage of amorphous materials — •Cesare Cejas1, Gustavo Gimenes1, Patrick Tabeling1, and Elisabeth Bouchaud1,2 — 1Microfluidics, MEMS, Nanostructures Laboratory, CNRS Gulliver UMR 7083, Institut Pierres Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin 75005 Paris, France — 2CEA-Saclay, IRAMIS, SPEC, F-91191, Gif-sur-Yvette, France
Fracture mechanisms in amorphous systems are still not fully understood. Because of their disordered nature, these materials break involving dissipative processes such as secondary cracking ahead of the main crack tip and local structural rearrangements. The aim of our work is to make and fracture amorphous systems composed of big enough "atoms", so that the above mentioned mechanisms can be observed optically.
Our amorphous materials being soft gels, we use microfluidics both to fabricate concentrated emulsions they are made from, and to investigate their controlled fracture. We synthesize soft emulsion gels based on a difunctional acrylic monomer through photopolymerization in order to get an "atom" size of ∼50µm. We vary the rheological properties of these emulsions by regulating conditions for polymerization. Using conventional optical microscopy, we hydraulically fracture these soft gels at controlled low rates and examine both micro-cracking and plastic events, i.e. the local irreversible displacements around the crack tip.