Titre du document / Document title
Creep of granular ice with and without dispersed particles
Auteur(s) / Author(s)
SONG Min (1) ;
COLE David M. (2) ;
BAKER Ian (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755-8000, ETATS-UNIS
(2) US Army Cold Regions Research and Engineering Laboratory, 72 Lyme Road, Hanover, New Hampshire 03755-1290, ETATS-UNIS
Résumé / Abstract
The effects of silt-sized particles (average diameter of 50 μm) on the compressive creep of polycrystalline ice have been studied at stress levels from 0.1 to 1.45 MPa and temperatures of -12°C and -10°C. Dislocation densities during creep have been estimated using a dislocation-based model of anelasticity. The results indicate that at low concentrations (up to 4wt.%), particles increase the minimum creep rate. Power-law behavior with an exponent of 3 was observed for both particle-free ice and ice with 1 wt.% particles when the stress was >0.3 MPa. In contrast, linear behavior was observed when the stress was <0.3 MPa. Calculations show that the linear behavior is associated with a constant dislocation density, and the power-law behavior is associated with increasing dislocation densities with increasing stress.
Revue / Journal Title
Journal of Glaciology
ISSN
0022-1430
CODEN JOGLAO
Source / Source
2005, vol. 51, n
o173, pp. 210-218 [9 page(s) (article)] (41 ref.)
Langue / Language
Anglais
Editeur / Publisher
International Glaciological Society, Cambridge, ROYAUME-UNI
(1947)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 5524, 35400013539763.0030
Nº notice refdoc (ud4) : 17339285
