Document Detail

Plasticity-induced structural anisotropy of silica glass.
MedLine Citation:
PMID:  19518968     Owner:  NLM     Status:  PubMed-not-MEDLINE    
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.
C L Rountree; D Vandembroucq; M Talamali; E Bouchaud; S Roux
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Publication Detail:
Type:  Journal Article     Date:  2009-05-12
Journal Detail:
Title:  Physical review letters     Volume:  102     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-06-12     Completed Date:  2009-07-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  195501     Citation Subset:  -    
CEA, IRAMIS, SPCSI, Groupe Fracture et Systèmes Complexes, F-91191 Gif sur Yvette, France.
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