Plasticity-induced structural anisotropy of silica glass
Other Condensed Matter
2009-05-15 v1
Abstract
Amorphous silica density at ambient pressure is known to depend on thermal history (through the quenching rate) but also, at room temperature, on the maximum pressure applied in the past. Here we show that beyond density, a mechanical loading can endow the structure with an orientational order. Molecular dynamics simulations show evidence that amorphous silica develops a permanent anisotropic structure after extended shear plastic flow. This anisotropy which survives for an unstressed specimen is revealed markedly by the fabric tensor computed over the Si-O-Si orientations, albeit the SiO4 tetrahedra microstructure remains mostly unaltered.
Keywords
Cite
@article{arxiv.0905.2319,
title = {Plasticity-induced structural anisotropy of silica glass},
author = {Cindy Linn Rountree and Damien Vandembroucq and Mehdi Talamali and Elisabeth Bouchaud and Stéphane Roux},
journal= {arXiv preprint arXiv:0905.2319},
year = {2009}
}