Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.195501
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Funding
- National Science Foundation Graduate Research program [0401467]
- ANR Grant Plastiglass [05-BLAN-0367-01]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0401467] Funding Source: National Science Foundation
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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 SiO(4) tetrahedra microstructure remains mostly unaltered.
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