Plasticity-induced structural anisotropy of silica glass

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.
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Submitted on : Thursday, May 14, 2009 - 2:46:49 PM
Last modification on : Thursday, July 4, 2019 - 11:00:05 AM
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  • HAL Id : hal-00384141, version 1
  • ARXIV : 0905.2319

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Cindy Rountree, Damien Vandembroucq, Mehdi Talamali, Elisabeth Bouchaud, Stéphane Roux. Plasticity-induced structural anisotropy of silica glass. Physical Review Letters, American Physical Society, 2009, 102, pp.195501. ⟨hal-00384141⟩

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