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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, no173, pp. 210-218 [9 page(s) (article)] (41 ref.)

Langue / Language

Anglais

Editeur / Publisher

International Glaciological Society, Cambridge, ROYAUME-UNI  (1947) (Revue)

Mots-clés anglais / English Keywords

Power law

;

debris

;

Size effect

;

Microparticle

;

Particle size

;

Solid inclusion

;

Dislocation density

;

creep

;

Compressive stress

;

mechanical properties

;

Polycrystal

;

Ice crystals

;

Mots-clés français / French Keywords

Loi puissance

;

Débris

;

Effet dimensionnel

;

Microparticule

;

Dimension particule

;

Inclusion solide

;

Densité dislocation

;

Fluage

;

Contrainte compression

;

Propriété mécanique

;

Polycristal

;

Cristal glace

;

Mots-clés espagnols / Spanish Keywords

Ley poder

;

Pedazos

;

Efecto dimensional

;

Micropartícula

;

Dimensión partícula

;

Inclusión sólida

;

Densidad dislocación

;

Fluencia

;

Tensión compresión

;

Propiedad mecánica

;

Policristal

;

Cristal hielo

;

Localisation / Location

INIST-CNRS, Cote INIST : 5524, 35400013539763.0030

Nº notice refdoc (ud4) : 17339285



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