Yielding under the microscope: a multi-scale perspective on brittle and ductile behaviors in oscillatory shear

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 behavio...

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Bibliographic Details
Published in:arXiv.org 2024-01
Main Authors: Edera, P, Brizioli, M, Madani, M, Ngouamba, E, Coussot, P, Trappe, V, Petekidis, G, Giavazzi, F, Cerbino, R
Format: Article
Language:English
Subjects:
Brittleness
Ductile-brittle transition
Edge dislocations
Fragility
Mechanical properties
Rheological properties
Shear bands
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Summary: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.
ISSN:2331-8422