Yielding and microstructure in a 2D jammed material under shear deformation
Abstract
The question of how a disordered material's microstructure translates into macroscopic mechanical response is central to understanding and designing materials like pastes, foams and metallic glasses. Here, we examine a 2D soft jammed material under cyclic shear, imaging the structure of ~50,000 particles. Below a certain strain amplitude, the structure becomes conserved at long times, while above, it continually rearranges. We identify the boundary between these regimes as a yield strain, defined without rheological measurement. Its value is consistent with a simultaneous but independent measurement of yielding by stress-controlled bulk rheometry. While there are virtually no irreversible rearrangements in the steady state below yielding, we find a largely stable population of plastic rearrangements that are reversed with each cycle. These results point to a microscopic view of mechanical properties under cyclic deformation.
Cite
@article{arxiv.1304.2253,
title = {Yielding and microstructure in a 2D jammed material under shear deformation},
author = {Nathan C. Keim and Paulo E. Arratia},
journal= {arXiv preprint arXiv:1304.2253},
year = {2013}
}