University of Birmingham > Talks@bham > Applied Mathematics Seminar Series > Yielding and shear banding of amorphous materials

Yielding and shear banding of amorphous materials

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If you have a question about this talk, please contact Dr Pradeep Keshavanarayana.

Amorphous materials include soft solids such as emulsions, gels, colloids, foams, granular matter and biological tissue, as well as hard materials such as metallic and molecular glasses. They find widespread applications in foods, pharmaceuticals, construction, oil extraction, lubricants, coatings, etc. Unlike conventional crystalline solids, they lack any order in the internal arrangement of their constituent microstructures (droplets, cells, grains, etc.). Understanding their rheological (deformation and flow) properties thus poses a major challenge. Typically, amorphous solids behave elastically at low loads then yield plastically at larger loads. They can then often suffer arbitrarily large deformations in this liquid state, but recover a solid state if the load is removed. Their internal microstructure and macroscopic shape are thus determined directly by the processing history they experience. In this seminar, I shall discuss recent progress understanding the dynamical process whereby an amorphous material in an initially solid-like state then yields and shows plastic flow, often with a strong strain localisation in the form of shear banding.

This talk is part of the Applied Mathematics Seminar Series series.

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