Couette geometry refers to two concentric rings in two dimensions (or cylinders) in three dimensions with a medium in between. Typically, the inner and outer rings (or cylinders) rotate at different rates and the response of the medium is studied. Here we study a medium which is a two-dimensional amorphous solid, and we rotate the inner ring quasistatically. As stress accumulates, plastic avalanches can result in shear localization, characterized by adjacent parts of the system rotating in opposite directions, with the maximum shear localized between them. We derive an analytic theory that describes and explains the shear localization, providing a priori predictions for the angle-averaged displacement field associated with the plastic drops and the shear localization.

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• Ductility
• Fracture
• Mechanical & acoustical properties
• Plasticity
• Stress
• Amorphous materials