Yielding under the microscope (Preprint)

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Zusammenfassung

We study the yielding transition in soft jammed materials under oscillatory shear, employing a novel methodology that combines rheological measurements with detailed dynamical observations. This method provides a comprehensive view of the intricate interactions between macroscopic mechanical behavior, mesoscopic deformation patterns, and microscopic dynamics during yielding. Our findings reveal two distinct yielding behaviors: at one end, a smooth, uniform transition, characterized by homogeneous strain fields, and Fickian, Gaussian microscopic dynamics; at the other, a sharp transition defined by pronounced shear banding, with the dynamics within shear bands being governed exclusively by the local strain, and exhibiting non-Gaussian, cooperative nature. The viscoplastic fragility emerges as a key macroscopic predictor of these intricate behaviors across micro- and meso-scales, providing a new perspective to understand and quantify ductile and brittle yielding in soft materials.

Publikation
Yielding under the microscope: a multi-scale perspective on brittle and ductile behaviors in oscillatory shear (Preprint)
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Roberto Cerbino
Roberto Cerbino
Professor für Experimental Soft Matter Physik

My research interests include distributed robotics, mobile computing and programmable matter.