Yielding under the microscope: a multi-scale perspective on brittle and ductile behaviors in oscillatory shear
Abstract
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.
Keywords
Cite
@article{arxiv.2402.00221,
title = {Yielding under the microscope: a multi-scale perspective on brittle and ductile behaviors in oscillatory shear},
author = {P. Edera and M. Brizioli and M. Madani and E. Ngouamba and P. Coussot and V. Trappe and G. Petekidis and F. Giavazzi and R. Cerbino},
journal= {arXiv preprint arXiv:2402.00221},
year = {2024}
}