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Titolo:
Snow as a foam of ice: plasticity, fracture and the brittle-to-ductile transition
Autore:
Kirchner, HOK; Michot, G; Narita, H; Suzuki, T;
Indirizzi:
Univ Paris 11, Inst Sci Mat, F-91405 Orsay, France Univ Paris 11 Orsay France F-91405 , Inst Sci Mat, F-91405 Orsay, France Ecole Mines, Phys Mat Lab, F-54042 Nancy, France Ecole Mines Nancy France F-54042 es, Phys Mat Lab, F-54042 Nancy, France Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0608628, Japan Hokkaido Univ Sapporo Hokkaido Japan 0608628 oro, Hokkaido 0608628, Japan Univ Tokyo, Inst Ind Sci, Minato Ku, Tokyo 1068558, Japan Univ Tokyo Tokyo Japan 1068558 Ind Sci, Minato Ku, Tokyo 1068558, Japan
Titolo Testata:
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS ANDMECHANICAL PROPERTIES
fascicolo: 9, volume: 81, anno: 2001,
pagine: 2161 - 2181
SICI:
1364-2804(200109)81:9<2161:SAAFOI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SINGLE-CRYSTALS; SILICON; TEMPERATURE; TOUGHNESS; TENSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Michot, G Univ Paris 11, Inst Sci Mat, Batiment 410, F-91405 Orsay, FranceUniv Paris 11 Batiment 410 Orsay France F-91405 5 Orsay, France
Citazione:
H.O.K. Kirchner et al., "Snow as a foam of ice: plasticity, fracture and the brittle-to-ductile transition", PHIL MAG A, 81(9), 2001, pp. 2161-2181

Abstract

At strain rates lower than 10(4) s(1), snow deforms plastically and fractures in a ductile manner; at higher strain rates it is brittle. The brittle-to-ductile transition has an activation energy of 0.6 +/- 0.1 eV. Plasticity preceding fracture is characterized by an activation energy of 0.6 +/- 0.05 eV for temperatures below -6 degreesC, and about 2.7 +/- 0.4 eV above. The basic deformation mechanism of snow, an ice foam, is power-law creep of ice. As in silicon, the activation energy of the brittle-to-ductile transition is the lowest of the activation energies of all deformation processes available, but in ice these are the same, 0.6 eV, for dislocation glide, diffusion and sublimation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 00:30:56