Intermittent, Cooperative Plastic Events in Soft Jammed Materials Under Oscillatory Shear

Explore the yielding transition in soft jammed materials under oscillatory shear through this 30-minute talk by Fabio Giavazzi at the Erwin Schrödinger International Institute for Mathematics and Physics. Delve into a novel methodology combining rheological measurements with microscopic dynamical observations. Discover two distinct contributions to shear-induced dynamics: a ballistic-like term associated with persistent, long-range correlated flow, and a Fickian contribution related to irreversible plastic rearrangements. Examine the super-linear dependence of the effective diffusion coefficient on strain amplitude and its Stokes-Einstein-like scaling with tracer particle radius. Investigate the microscopic dynamics in shear banding materials, where deformation profiles deviate from linearity. Learn about the cooperative and non-Gaussian statistics of shear-induced rearrangements in shear banding, contrasting with non-cooperative and Gaussian behavior in homogeneous yielding. Understand how dynamic heterogeneity acts as a precursor to shear concentration, anticipating the formation of mesoscopic shear bands. This talk was part of the Thematic Programme on "Non-equilibrium Processes in Physics and Biology" held at the ESI in 2024.