Local Stress Relaxation and Shear-banding in a Dry Foam under Shear

TL;DR

This paper presents a simulation study of 2D dry foams under shear, revealing shear-banding instability and providing insights into the mechanical response and flow localization in amorphous systems.

Contribution

It introduces a realistic simulation model for dry foam shear behavior and proposes a scenario for flow localization applicable to athermal amorphous materials.

Findings

Observation of shear-banding instability after transient

Mechanical response of foam to plastication events analyzed

Proposed scenario for flow localization stability

Abstract

We have developed a realistic simulation of 2D dry foams under quasi-static shear. After a short transient, a shear-banding instability is observed. These results are compared with measurements obtained on real 2D (confined) foams. The numerical model allows us to exhibit the mechanical response of the material to a single plastication event. From the analysis of this elastic propagator, we propose a scenario for the onset and stability of the flow localization process in foams, which should remain valid for most athermal amorphous systems under creep flow.