期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.195501
关键词
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资金
- 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
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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