Artículo
Damage Accumulation in Silica Glass Nanofibers
Fecha de publicación:
07/2018
Editorial:
American Chemical Society
Revista:
Nano Letters
ISSN:
1530-6984
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The origin of the brittle-to-ductile transition, experimentally observed in amorphous silica nanofibers as the sample size is reduced, is still debated. Here we investigate the issue by extensive molecular dynamics simulations at low and room temperatures for a broad range of sample sizes, with open and periodic boundary conditions. Our results show that small sample-size enhanced ductility is primarily due to diffuse damage accumulation, that for larger samples leads to brittle catastrophic failure. Surface effects such as boundary fluidization contribute to ductility at room temperature by promoting necking, but are not the main driver of the transition. Our results suggest that the experimentally observed size-induced ductility of silica nanofibers is a manifestation of finite-size criticality, as expected in general for quasi-brittle disordered networks.
Palabras clave:
DUCTILITY
,
FRACTURE
,
NANOFIBERS
,
NANOWIRES
,
SILICA
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Bonfanti, Silvia; Ferrero, Ezequiel E.; Sellerio, Alessandro; Guerra, Roberto; Zapperi, Stefano; Damage Accumulation in Silica Glass Nanofibers; American Chemical Society; Nano Letters; 18; 7; 7-2018; 4100-4106
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