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YouTube

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

Erwin Schrödinger International Institute for Mathematics and Physics (ESI) via YouTube

Overview

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.

Syllabus

Fabio Giavazzi- Intermittent, cooperative plastic events associated with homogeneous and hetero...

Taught by

Erwin Schrödinger International Institute for Mathematics and Physics (ESI)

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