Plasticity-induced structural anisotropy of silica glass

Details Plasticity-induced structural anisotropy of silica glass Plasticity-induced structural anisotropy of silica glass

2009-05-14

arxiv.org/abs/0905.2319v1

Physical Review Letters 102 (2009) 195501

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

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.

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